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Hioki 8841 Instruction Manual

Memory hicorder
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INSTRUCTION MANUAL
8841
8842
MEMORY HiCORDER

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Summary of Contents for Hioki 8841

  • Page 1 INSTRUCTION MANUAL 8841 8842 MEMORY HiCORDER...

  • Page 3: Table Of Contents

    2.2 Power Supply and Ground Connections 2.2.1 Connecting the AC Power Supply 2.2.2 Connecting the 9433 DC POWER ADAPTER 2.2.3 Functional Grounding of the 8841/8842 2.3 Power On/Off 2.4 Connection of the Input Unit 2.4.1 8936/ 8938/ 8946 ANALOG UNITs 2.4.2 8937 VOLTAGE/TEMP UNIT...
  • Page 4 3.2 Other Keys Operation 3.3 Screen Configuration Chapter 4 Memory Recorder Function 4.1 Overview of the Memory Recorder Function 4.2 Operation Sequence (MEM) 4.3 STATUS Settings (MEM) 4.3.1 Setting the Function Mode 4.3.2 Setting the Time Axis Range 4.3.3 Setting the Recording Length 4.3.4 Setting the Display Layout 4.3.5 Setting the Interpolation (dot-line) 4.3.6 Setting the Print Mode...
  • Page 5 5.4.2 Setting the Channel Screen 5.4.3 Setting the Display Screen 5.5 Settings on the Waveform Display Screen (REC) 5.6 Start and Stop Operation (REC) Chapter 6 RMS Recorder Function 6.1 Overview of the RMS Recorder Function 6.2 Operation Sequence (RMS) 6.3 STATUS Settings (RMS) 6.3.1 Setting the Function Mode 6.3.2 Setting the Time Axis Range...
  • Page 6 Chapter 8 FFT Function 8.1 Overview of the FFT Function 8.2 Operation Sequence (FFT) 8.3 STATUS1 Settings (FFT) 8.3.1 Setting the Function Mode 8.3.2 Setting the FFT Channel Mode 8.3.3 Setting the Frequency Range 8.3.4 FFT Number of Points Setup 8.3.5 Setting the Window Function 8.3.6 Setting the Display Format 8.3.7 Selecting Reference Data...
  • Page 7 Chapter 9 Input Channel Settings 9.1 Overview 9.2 Operation Procedure (Input Channel Setting) 9.3 Setting the CHANNEL Screen 9.3.1 Setting the Waveform Display Color 9.3.2 Setting the Waveform Display Graph Position 169 9.3.3 Setting the Voltage Axis Range 9.3.4 Setting the Input Coupling 9.3.5 Setting the Magnification/Compression Ratio Along the Voltage Axis 9.3.6 Setting the Zero Position...
  • Page 8 9.14.5 Setting the Current Measurement 9.15 Setting the 8947 CHARGE UNIT 9.15.1 Acceleration Measurement (Charge/Preamp) Selection 9.15.2 Setting the Sensor Sensitivity 9.15.3 Setting the Voltage Measurement Chapter 10 Trigger Functions 10.1 Overview of the Trigger Functions 10.2 Operation Sequence (Trigger mode setting) 10.3 TRIGGER Screen Organization 10.4 Trigger Mode 10.5 Pre-trigger...
  • Page 9 Chapter 12 SYSTEM Screen Settings 12.1 Overview 12.2 SET UP Screen (SYSTEM 1) 12.2.1 Using Channel (MEM only) 12.2.2 Start Backup 12.2.3 Backlight Saver 12.2.4 Display Color 12.2.5 Beep Sound 12.2.6 Display Language 12.2.7 Grid Type 12.2.8 Channel Marker 12.2.9 Time Value 12.2.10 List &...
  • Page 10 Chapter 13 Printout of Measurement Data 13.1 Printout of Measurement Data Operating Procedure 13.2 Setting the STATUS Screen (printout) 13.2.1 Setting the Display Format 13.2.2 Setting the Print Mode 13.3 Setting the CHANNEL Screen (printout) 13.3.1 Setting the Print Density 13.3.2 Setting the Waveform Display Graph Position 289 13.4 Setting the SYSTEM Screen (printout) 13.4.1 SET UP Screen (SYSTEM 1)
  • Page 11 14.7.1 Setting the Data to Store 14.8 Loading the Data (LOAD) 14.9 File Information (INFO) 14.10 Deleting the Data (DELETE) 14.11 Sorting Files (SORT) 14.12 Operating the Directory 14.12.1 Making a Directory (MK DIR) 14.12.2 Changing a Directory (CH DIR) 14.12.3 Deleting a Directory (RM DIR) 14.13 Printing the File List Chapter 15 Memory Segmentation Function...
  • Page 12 Chapter 17 External Input/ Output Terminals/ Key Lock Function 17.1 External Input/Output Terminals 17.1.1 Connecting the Terminals 17.1.2 External Trigger Input Terminal [EXT TRIG] 17.1.3 Trigger Output Terminal [TRIG OUT] 17.1.4 External Sampling Terminal [EXT SMPL] 17.1.5 External Print Terminal / External Start/Stop Terminal 17.1.6 GO/NG Evaluation Output Terminal 17.2 Using the Key Lock Function...
  • Page 13 Chapter 20 Maintenance and Service 20.1 Maintenance and Inspection 20.2 Replacing the Input Units 20.3 Replacing the Fuse of the 9433 20.4 Removing the Battery Before Discarding the Unit 419 20.5 Troubleshooting Appendix APPENDIX 1 Appendix 1 Error Messages APPENDIX 1 Appendix 2 Glossary APPENDIX 6 Appendix 3 Reference...
  • Page 15 ──────────────────────────────────────────────────── Introduction Thank you for purchasing the HIOKI "8841/42 MEMORY HiCORDER." To obtain maximum performance from the product, please read this manual first, and keep it handy for future reference. Inspection When the unit is delivered, check and make sure that it has not been damaged in transit.
  • Page 16 9349 CARRYING CASE (for 8842) 9231 RECORDING PAPER (6 rolls) 220H PAPER WINDER *1: Only used with 8841/ *2: no CE marking The 9270 to 9272 CLAMP ON SENSORs and 9277 to 9279 UNIVERSAL NOTE CLAMP ON CTs are designed for use only with the 9555 SENSOR UNIT, and cannot be used alone.

  • Page 17: Safety Notes

    ──────────────────────────────────────────────────── Safety Notes This manual contains information and warnings essential for safe operation of the product and for maintaining it in safe operating condition. Before using the product, be sure to carefully read the following safety notes. This product is designed to conform to IEC 61010 Safety DANGER Standards, and has been thoroughly tested for safety prior to shipment.
  • Page 18 ──────────────────────────────────────────────────── The following symbols are used in this Instruction Manual to indicate the relative importance of cautions and warnings.  Indicates that incorrect operation presents extreme danger of DANGER accident resulting in death or serious injury to the user. Indicates that incorrect operation presents significant danger of WARNING accident resulting in death or serious injury to the user.

  • Page 19: Notes On Use

    Inspection before Use Before using the product the first time, verify that it operates normally to ensure that the no damage occurred during storage or shipping. If you find any damage, contact your dealer or Hioki representative. Power Supply Connections DANGER Before connecting the unit, make sure that the power supply voltage matches the rated power supply voltage of the unit.
  • Page 20 Logic Probe Connection DANGER The logic input and 8841/42 Unit share a common ground. Therefore, if power is supplied to the measurement object of the logic probe and to the 8841/42 from different sources, an electric shock or damage to the equipment may result.
  • Page 21 MO drive is open. Maximum laser output is 50 mW (at 685 nm, pulsed). A laser warning label is attached to the bottom of the 8841/42 Unit. Refer to Section 1.2, "Identification of Controls and Indicators" for the label location.
  • Page 22 Never use abrasives or solvent cleaners. ･ Hioki shall not be held liable for any problems with a computer system that arises from the use of this CD-R, or for any problem related to the purchase of a Hioki product.

  • Page 23: Chapter Summary

    ──────────────────────────────────────────────────── Chapter Summary Chapter 1 Product Overview Contains an overview of the unit and its features. Chapter 2 Installation and Preparation Explains how to set the unit up for measurement. Chapter 3 Basic Key Operation Explains how to operate the keys and the Jog/Shuttle control for carrying out basic measurement functions.
  • Page 24 ──────────────────────────────────────────────────── Chapter 16 Waveform Operation Function Explains how to use the Calculating, Waveform Parameters/Evaluating Parameter value and Waveform GO/NG Evaluation. Chapter 17 External Input/ Output Terminals/ Key Lock Function Gives specifications and usage details of the external input/output terminals, and explains how to use the key lock function. Chapter 18 Specifications Contains general specifications and detailed function specifications.

  • Page 25: Chapter 1 Product Overview

    ・Recorder & Memory Recorder function provides combined recorder and memory recorder functions ・FFT function offers 12 types of analysis functions (4) Storage capacity The 8841/8842 has a standard storage capacity of 8 M words, expandable to 32 M words with memory upgrades. (5) Trigger function ・Digital trigger circuit ・Trigger types: level trigger, window-in trigger, window-out trigger, voltage...
  • Page 26 ──────────────────────────────────────────────────── (6) Simple function key interface (GUI) Thanks to its GUI-inspired design using large function key graphics, the unit is easy to set up and operate. (7) On-line help On-line help guides the user through operation steps and various functions. (8) Scaling function By setting the physical amount and the unit to be used for 1 V input, the measurement result can be converted into any desired scale.

  • Page 27: Identification Of Controls And Indicators

    ──────────────────────────────────────────────────── 1.2 Identification of Controls and Indicators (example: 8841) Front Panel STATUS key Causes the display to show the STATUS screen which serves for setting most measurement parameters. CHAN key Causes the display to show the CHANNEL or Variable screen which serves for making input channel settings.
  • Page 28 ──────────────────────────────────────────────────── FILE key Causes the display to show the FILE screen which serves for reading, storing, etc. the waveform data etc. PRINT key Serves to print out stored waveforms. Output destination can be set on the SYSTEM4 screen. COPY key Serves to print out a hard copy of the current screen display.
  • Page 29 ──────────────────────────────────────────────────── 13 14 15 Right Side Panel AC power switch Switches on or off the AC power supply. AC connector The supplied power cord must be plugged in here. Function ground terminal Connects to the earth. (GND) DC connector Connects to the optional 9433 DC POWER ADAPTER. Logic probe connectors Input connector for the logic input section, designed for the dedicate logic probes (CH A to D).
  • Page 30 Upper Panel Left Side Panel Bottom Panel Rear Panel Handle Serves for transporting the 8841/42. Ventilation slots Printer Stand The unit can also be propped up at an angle using the stand. Laser warning label (when the 9607 MO UNIT is installed) ────────────────────────────────────────────────────...

  • Page 31: Chapter 2 Installation And Preparation

    ──────────────────────────────────────────────────── Chapter 2 Installation and Preparation 2.1 Installation of the Unit Installation orientation Install the unit on a flat, level surface. The unit can also be propped up at an angle, using the stand. Stand When the MO drive is used, do not use the stand to prop up the unit. NOTE ────────────────────────────────────────────────────...
  • Page 32 ──────────────────────────────────────────────────── Ambient conditions Temperature 5 to 40 , 23±5 recommended for high-precision measurements. Humidity 35 to 80%RH (no condensation); 50±10%RH (no condensation) recommended for high-precision measurements. Ventilation Take care not to block the ventilation openings and assure proper ventilation. When using the unit in an upright position, take care not to block the openings on both side.

  • Page 33: Power Supply And Ground Connections

    To avoid electric shock and ensure safe operation, connect the power cable to a grounded (3-contact) outlet. 1. Verify that the AC power switch of the 8841/42 is set to OFF. 2. Plug the grounded three-core power cord supplied into the AC power connector on the right side of the 8841/42.

  • Page 34: Connecting The 9433 Dc Power Adapter

    To turn power back on, turn off 9433 DC POWER ADAPTER switch, wait approximately one minute, then turn on the switch. ･ If both the AC power supply and 9433 are connected to the 8841/8842, the AC power supply has priority. However, even when the 8841/8842 runs off the AC power supply, the 9433 remains in standby mode and consumes some power.
  • Page 35 Actual running time may differ, depending on battery age, charge condition, ambient temperature, and other factors. If the 9433 is connected to the 8841/8842, and the adapter switch is turned on, even when the 8841/8842 runs off the AC power supply, the 9433 remains in standby mode and consumes some power.

  • Page 36: Functional Grounding Of The 8841/8842

    ──────────────────────────────────────────────────── 2.2.3 Functional Grounding of the 8841/8842 When the 8841/8842 is used in noise-prone environments, connect the functional grounding terminal to improve noise characteristics. Functional grounding terminal ──────────────────────────────────────────────────── 2.2 Power Supply and Ground Connections...

  • Page 37: Power On/Off

    NOTE connected to the 8841/8842, the AC power supply has priority. However, even when the 8841/8842 runs off the AC power supply, the 9433 remains in standby mode and consumes some power. Keep this in mind when connecting the 9433 to the battery while the 8841/8842 is connected to an AC power source.

  • Page 38: Connection Of The Input Unit

    When the 8946 4-channel analog unit is used, input channels 1 to 4 are not set in this customary sequence on the 8841. The slot position at which the 8946 is mounted determines the set input channel (see the illustration below).

  • Page 39: 8937 Voltage/Temp Unit

    Connecting to the connector cable (voltage measurement) 1. Align the BNC connector with the guide groove of the 8841/42 input connector, and turn clockwise while pressing in to lock the connector.

  • Page 40: 8939 Strain Unit

    ──────────────────────────────────────────────────── 2.4.3 8939 STRAIN UNIT Connect only the sensor to the conversion cable supplied with the 8939 CAUTION STRAIN UNIT. To disconnect the conversion cable, always unlock the plug and pull out the cable. Connecting to the main unit 1. Align the projection on the unit connector with the cutout on the conversion cable, and insert the plug into the connector.

  • Page 41: 8940 F/V Unit

    Groove of the BNC connection to the F/V UNIT. 1. Align the BNC connector with the guide groove of the 8841 input connector, and turn clockwise Connector guide while pressing in to lock the connector. 2. To remove from the unit, turn the BNC connector counterclockwise to release the lock, then pull it.
  • Page 42 ──────────────────────────────────────────────────── Clamp connection (Current measurement) The following clamp-on sensors and clamp-on probes can be connected using the 9318 and 9319 CONVERSION CORDs. 9318：9270, 9271, 9272, 9277, 9278, 9279 9319：3273 It can be connected to a maximum of 4 channels. Connecting the 9318 CONVERSION CABLE Unit's sensor connector 1.

  • Page 43: 8947 Charge Unit

    PREAMP mode. We recommend the Model 9198 CONNECTION CORD for the VOLTAGE mode. 1. Align the BNC connector with the guide groove of the 8841/42 input connector, and turn clockwise while pressing in to lock the connector. 2. To remove from the unit, turn the BNC connector counterclockwise to release the lock, then pull it.

  • Page 44: Logic Probe Connection

    ･ If no logic probe is connected, the corresponding logic waveform is NOTE displayed on the screen at high level. ･ Carefully read the instruction manual supplied with the probe. ･ Do not connect logic probes other than supplied by HIOKI to the logic inputs. ──────────────────────────────────────────────────── 2.5 Logic Probe Connection...

  • Page 45: 9018-10/9132-10 Clamp On Probe

    It cannot be used to perform current measurements by itself. Connections Connect the BNC connector of the 9018-10/9132-10 CLAMP ON PROBE to the analog input of the 8841/42. Refer to "2.4 Connection of the Input Unit." 9132-10 9018-10 ･...

  • Page 46: 9322 Differential Probe Connection

    9322 is a differential probe that connects to input of 8841/42 MEMORY HiCORDER input unit. For more details, refer to its instruction manual.

  • Page 47: Loading Recoding Paper

    ──────────────────────────────────────────────────── 2.8 Loading Recoding Paper 1. Press the stock cover and open it. Stock cover Head up/down lever 2. Put down the head up/down lever. Holder 3. Insert the attachments into the ends of the roll of recording paper and set the paper into its holder.
  • Page 48 ──────────────────────────────────────────────────── 5. Align the edges of the recording paper you pulled out of the printer with the edges of the recording paper set into the holder. If the edges of the recording paper are not aligned exactly, the paper will come out crooked when printing.

  • Page 49: Care Of Recording Paper

    ──────────────────────────────────────────────────── 2.9 Care of Recording Paper Care of recording paper ・While unopened, thermal paper will not be affected by the environment, provided that ambient temperature and humidity do not exceed normal levels. For long-term storage, temperature should be lower than 40 . Low temperatures cause no problem.

  • Page 50: Notes On Measurement

    ──────────────────────────────────────────────────── 2.10 Notes on Measurement Maximum input voltage ratings for the input unit and the input terminals DANGER of the unit are shown below. To avoid the risk of electric shock and damage to the unit, take care not to exceed these ratings. The maximum rated voltage to earth of the input unit (voltage between input terminals and main unit frame ground, and between inputs of other analog units) is shown below.
  • Page 51 ──────────────────────────────────────────────────── Before using the unit, make sure that the sheathing on the input cables CAUTION is not damaged and that no bare wire is exposed. If there is damage, using the unit could cause electric shock. Replace with the specified 9197 or 9198 CONNECTION CORD.

  • Page 52: Maximum Input Voltage

    ──────────────────────────────────────────────────── 2.10.1 Maximum Input Voltage ■ 8936 ANALOG UNIT, 8938 FFT ANALOG UNIT 8841/42 8936 400 VDC max. 8938 370 VAC/DC 370 VAC/DC ■ 8937 VOLTAGE/TEMP UNIT 8841/42 8937 30 Vrms or 60 VDC 8946 30 Vrms or 60 VDC 30 Vrms or 60 VDC ■...

  • Page 53: Using A Voltage Transformer

    When making measurements on an AC power line for example, using a voltage transformer, be sure to connect the voltage transformer ground terminal to ground. When the voltage transformer has a ground terminal 8936 8841/42 GND terminal Input Voltage transformer (PT) ground terminal...
  • Page 54 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 2.10 Notes on Measurement...

  • Page 55: Chapter 3 Basic Key Operation

    ──────────────────────────────────────────────────── Chapter 3 Basic Key Operation 3.1 Basic Key Operation 3.1.1 Basic Display Operation (MENU) Displays the STATUS screen. STATUS STATUS Serves to switch pages of the STATUS screen. Serves to make main settings for various functions on the STATUS screen. Displays the CHANNEL screen.

  • Page 56: Setting The Items

    ──────────────────────────────────────────────────── 3.1.3 Setting the Items The respective items are shown in the function key display. F1 to F5 (Function Select and set the items. keys) keys Serve to move the flashing cursor or use the key lock CURSOR function. 3.1.4 Jog/Shuttle Controls and Select Key Use the select key when the screen is in measurement display mode.

  • Page 57: Basic Input Operation

    ──────────────────────────────────────────────────── 3.1.5 Basic Input Operation Set the basic settings for analog channels. See Chapter 9. keys Used to select channels and input values for connected input CH1 - CH16 units In the DISPLAY or CHANNEL screen, these keys are used to select channels or set channels directly by means of the knobs.

  • Page 58: Other Keys Operation

    ──────────────────────────────────────────────────── 3.2 Other Keys Operation MANU When the unit is in trigger standby mode, pressing MANU TRIG TRIG Manual trigger this key causes manual triggering. See Section 10.12. Enables the measurement conditions for each channel CH. SET CH.SET Channel on the display screen to be set or changed. settings Settings remain in effect even during startup.

  • Page 59: Screen Configuration

    ──────────────────────────────────────────────────── 3.3 Screen Configuration DISPLAY screen Channel setting screen View screen Level monitor screen The waveform display The input channel can The input level can be s34-1 position and block viewed and set. be set. Press the s34-2 occupation status can key to change CH.SET be viewed.
  • Page 60 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 3.3 Screen Configuration...

  • Page 61: Chapter 4 Memory Recorder Function

    ──────────────────────────────────────────────────── Chapter 4 Memory Recorder Function 4.1 Overview of the Memory Recorder Function The memory recorder function has the following features. (1) After being stored in the internal memory, input signal data can be displayed and printed. (2) All input channel data are recorded on the same time axis. Since data for all channels can be superimposed, the relative relationship between input signals can be observed visually.
  • Page 62 ──────────────────────────────────────────────────── (10) Logging function Numeric printout of waveform data (11) Memory segmentation function ・Helps to reduce dead time of continuous recording. (Sequential save function) ・Memory is divided into blocks which can freely selected by the user for storing measurement data. (Multi-block function) (12) Processing function ・Waveform processing (arithmetic processing, differential processing etc.) ・Waveform parameter processing (frequency measurement, rms measurement...

  • Page 63: Operation Sequence (Mem)

    ──────────────────────────────────────────────────── 4.2 Operation Sequence (MEM) Preparation Installation of the Unit Turn on the power See Chapter 2 Connect the inputs Basic Settings Settings on the STATUS1 screen Function Select the memory recorder function. Time axis range Determine the speed with which the Section 4.3 input signal waveform is captured.
  • Page 64 ──────────────────────────────────────────────────── Setting the input channel (See Chapter 9) Settings on the channel screen Waveform display color Waveform display graph Voltage axis range Input coupling Logic input Magnification/compression along voltage Zero position Zero adjustment Offset cancel Low-pass filter Settings on the variable screen Variable function (See Chapter 9.7) Settings the advanced function Scaling function (See Chapter 9.8)

  • Page 65: Status Settings (Mem)

    ──────────────────────────────────────────────────── 4.3 STATUS Settings (MEM) Press the key to access the STATUS1 screen. This section explains STATUS how to set the STATUS screen of the memory recorder function. See the corresponding sections for items that can be set in the Waveform display or CHANNEL screens.

  • Page 66: Setting The Function Mode

    ──────────────────────────────────────────────────── 4.3.1 Setting the Function Mode The 8841/42 has five function modes. Select the Memory recorder function. Procedure Screen: STATUS1, CHANNEL, TRIGGER, Waveform display 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the top position.

  • Page 67: Setting The Recording Length

    ──────────────────────────────────────────────────── 4.3.3 Setting the Recording Length The length of recording for one measurement operation (number of DIV) can be set. Select the recording length. SELECT Variable recording length can be selected by the user. ARBITRARY Screen: STATUS1, Waveform display Procedure 1 Constant recording length mode 1.

  • Page 68: Setting The Display Layout

    ──────────────────────────────────────────────────── 4.3.4 Setting the Display Layout ・The layout can be set for showing input signals on the screen display and recording them on the printer. ・The following layout is available: single, dual, quad, oct (Waveform display screen), hex (print only, oct graph on Waveform display screen) X-Y single, X-Y dual (dot/line).
  • Page 69 ──────────────────────────────────────────────────── Quad graph Single graph Dual graph ･ Display and record as four ･ Display and record as two Display and record as one graph. graphs. (At the most, 16 analog graphs. (At the most, 16 analog (At the most, 16 analog + 16 + 8 logic signals) + 16 logic signals) logic signals)

  • Page 70: Setting The Interpolation (Dot-Line)

    ──────────────────────────────────────────────────── 4.3.5 Setting the Interpolation (dot-line) ・Interpolation can be set when set the X-Y graph format. ・This setting determines whether the input waveform (sampling data) is to be displayed and printed as a series of dots or a line using linear interpolation. Procedure Screen: STATUS1 1.

  • Page 71: Setting The Roll Mode

    ──────────────────────────────────────────────────── 4.3.7 Setting the Roll Mode ・This mode can be used at a time axis range setting of 10 ms/DIV or slower. ・In normal recording, the waveform is displayed only after all data of the recording length have been captured. At low sampling speed settings, this will cause a considerable delay between the start of measurement and the appearance of the waveform on the display.

  • Page 72: Setting The Auto Save Function

    : Data are stored as binary data. : Data are stored as text data. Data stored in the text format is not readable by the 8841/42. 6. When the data format to be saved is set to text data, the intermittent setting item is displayed.
  • Page 73 ──────────────────────────────────────────────────── 7. Set the file name. For the input method, refer to Section 9.9.3. When using auto-save, a number is appended to the name you specify as the file name. This then becomes the file name. If you start procedures before specifying a file name, AUTO is automatically enabled.

  • Page 74: Setting The Overlay Function

    ──────────────────────────────────────────────────── 4.3.10 Setting the Overlay Function ・Overlay is performed without clearing the currently displayed waveform (if trigger mode is REPEAT or AUTO). This allows comparison to the immediately preceding waveform. ・If trigger mode is SINGLE, measurement terminates after one set of data has been collected.

  • Page 75: Setting The Averaging Function

    ──────────────────────────────────────────────────── 4.3.11 Setting the Averaging Function ・The averaging function allows capturing several instances of a waveform and determining the average. ・This makes it possible to eliminate noise and irregular signal components. ・The higher the number of averaging instances, the more effectively will noise be suppressed.
  • Page 76 ──────────────────────────────────────────────────── Averaging and trigger mode (1) Trigger mode: SINGLE 1. After the key was pressed, data are captured whenever the trigger START conditions are fulfilled, and summing averaging is carried out. 2. When the specified number of data has been captured, measurement stops automatically.

  • Page 77: Setting The Waveform Evaluation

    ──────────────────────────────────────────────────── 4.3.12 Setting the Waveform Evaluation ･ Display format can be set on single screen or X-Y single screen. ･ GO (pass) or NG (fail) evaluation of the input signal waveform can be performed using an evaluation area specified by the user. This can serve to detect irregular waveforms.

  • Page 78: Using The X-Y Waveform Plots (Mem)

    ──────────────────────────────────────────────────── 4.4 Using the X-Y Waveform Plots (MEM) ・Setting the display format to X-Y in status screen allows X-Y waveforms to be combined. Any of channels 1 to 16 can be selected for each of the X and Y axis. Up to four X-Y plots can be made simultaneously. ・Voltage axis magnification/compression is active also when using X-Y combined plotting.
  • Page 79 ──────────────────────────────────────────────────── Procedure Screen: STATUS1 1. Press the key to display the STATUS1 screen. STATUS 2. Move the flashing cursor to the item. format 3. Use the function keys to select the format. X-Y single X-Y dual 4. Set the interpolation. (See Section 4.3.5) 5.
  • Page 80 ──────────────────────────────────────────────────── Switching the X-Y1 Screen Display (Wide Display) Setting the display format to X-Y1 in the STATUS1 screen allows you to switch between wide screen display and normal screen display each time you press the key. DISP Normal Display Screen Wide Display Screen ────────────────────────────────────────────────────...

  • Page 81: Settings On The Waveform Display Screen (Mem)

    ──────────────────────────────────────────────────── 4.5 Settings on the Waveform Display Screen (MEM) Explains the setting items on the Waveform display screen. For details on setting, refer to Section 4.3. When want to use the Jog/Shuttle control, press the select key.（The VALUE selection window is not displayed.) Setting items Selection Explanation...

  • Page 82: Auto Range Function

    ──────────────────────────────────────────────────── 4.6 Auto Range Function This function automatically selects the time axis range, measurement range and zero position. Taking the lowest numbered channel among the channels for which waveform display is on, 1 to 2.5 cycles are automatically set to be recorded as 15 divisions.
  • Page 83 ──────────────────────────────────────────────────── ･ Because the auto-range function performs automatic setting for the input NOTE signal present at the time the function is executed, input a signal before executing the function. ･ If for the input signal for this channel there is only a small difference between the maximum value and the minimum value in the range of highest sensitivity (5 mV/DIV), the setting is made by taking the next higher channel.

  • Page 84: Other Screen Settings

    ──────────────────────────────────────────────────── 4.7 Other Screen Settings The status screen for the memory recorder function contains three more setup screens. For detailed setup procedures, see the associated sections. STATUS2 screen: Memory Segmentation Screen (See Chapter 15) STATUS3 screen: Parameter Calculation Screen (See Section 16.1) STATUS4 screen: Calculating Waveform Data Screen (See Section 16.2) s47-1, 2, 3, 4...

  • Page 85: Start And Stop Operation (Mem)

    When the key is pressed twice during measurement, the STOP 8841/42 is forcibly stopped. Then the waveform data until the key is pressed is displayed and saved. When the auto STOP saving is set to ON, the data until a forced termination is automatically saved.
  • Page 86 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 4.8 Start and Stop Operation (MEM)

  • Page 87: Chapter 5 Recorder Function

    ──────────────────────────────────────────────────── Chapter 5 Recorder Function 5.1 Overview of the Recorder Function The recorder function has the following features. (1) Real time display and printing of the input signal (2) Real time continuous recording of the input signal (3) All input channel data are recorded on the same time axis. Since data for all channels can be superimposed, the relative relationship between input signals can be observed visually.
  • Page 88 ──────────────────────────────────────────────────── (10) Scrollable display ・The most recent 2000 (32 M words: 10000) divisions of the data are stored in memory. ・It is possible to scroll back for easy review. (11) Additional recording function ・The first set of measurement data is preserved, and recording of the second set of measurement data starts after the first set.

  • Page 89: Operation Sequence (Rec)

    ──────────────────────────────────────────────────── 5.2 Operation Sequence (REC) Preparation Installation of the Unit Turn on the power See Chapter 2 Connect the inputs Basic Settings Settings on the STATUS screen Function Select the recorder function. Time axis range Determine the speed with which the Section 5.3 input signal waveform is captured.
  • Page 90 ──────────────────────────────────────────────────── Setting the input channel (See Chapter 9) Settings on the channel screen Waveform display color Waveform display graph Voltage axis range Input coupling Logic input Magnification/compression along voltage Zero position Zero adjustment Offset cancel Low-pass filter Settings on the variable screen Variable function (See Chapter 9.7) Settings the advanced function Scaling function (See Chapter 9.8)

  • Page 91: Status Settings (Rec)

    ──────────────────────────────────────────────────── 5.3 STATUS Settings (REC) Press the key to access the STATUS screen. This section explains STATUS how to set the STATUS screen of the recorder function. See the corresponding sections for items that can be set in the Waveform display or CHANNEL screens.

  • Page 92: Setting The Function Mode

    ──────────────────────────────────────────────────── 5.3.1 Setting the Function Mode The 8841/42 has five function modes. Select the Recorder function. Procedure Screen: STATUS, CHANNEL, Waveform display, TRIGGER 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the top position.

  • Page 93: Setting The Sampling Period

    ──────────────────────────────────────────────────── 5.3.3 Setting the Sampling Period The available range depends on the selected time axis range (input signal waveform capture rate). Procedure Screen: STATUS 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the item.

  • Page 94: Setting The Display Layout

    ──────────────────────────────────────────────────── Procedure 2 Variable recording length mode 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the item and select shot ARBITRARY 3. Use the Jog/Shuttle control or the function keys to make a setting. To change the column, use the cursor keys ( Function Meaning...
  • Page 95 ──────────────────────────────────────────────────── 7. Use the function keys to select. Function ##F2 display Meaning : Move the cursor up in the selection window. : Move the cursor down in the selection window. In the cases of HEX, as far as the printer recording output is concerned, the waveforms for each channel are automatically distributed on each graph according to the table below: For details on logic channels, refer to Section 9.3.8.
  • Page 96 ──────────────────────────────────────────────────── Quad graph Single graph Dual graph ･ Display and record as four ･ Display and record as two Display and record as one graph. graphs. (At the most, 16 analog graphs. (At the most, 16 analog (At the most, 16 analog + 16 + 8 logic signals) + 16 logic signals) logic signals)

  • Page 97: Setting The Print Mode

    ──────────────────────────────────────────────────── 5.3.6 Setting the Print Mode Select the format, waveform, or numerical value should be used to output measured data. The waveform is printed. Waveform The data spacing interval also must be set. Numerical value Procedure Screen: STATUS (1) Setting the printer format 1.

  • Page 98: Setting The Additional Recording Function

    ──────────────────────────────────────────────────── 5.3.7 Setting the Additional Recording Function This records, regarding the memory as though it were recording paper. The memory capacity of 8 M words can accommodate up to 2000 divisions of waveform data. With 32 M words (after optional memory expansion), waveform data of up to 10000 divisions can be saved.

  • Page 99: Setting The Printer Function (Real Time Printing)

    ──────────────────────────────────────────────────── ･ Time values output to the printer and displayed on the screen with the NOTE additional recording function enabled are equal to those of the most recently acquired waveforms. Therefore, when measuring waveforms in a different time axis range, always take that difference into consideration. ･...

  • Page 100: Setting The Auto Save Function

    : Data are stored as binary data. : Data are stored as text data. Data stored in the text format is not readable by the 8841/42. 6. When the data format to be saved is set to text data, the intermittent setting item is displayed.

  • Page 101: Setting The Interpolation (Dot-Line, X-Y Only)

    ──────────────────────────────────────────────────── ･ File names consist of 8 characters (or 4 double-byte characters). With auto- NOTE save, since numbers are attached to the end of file names, long file names are truncated when this number is appended to the end of the file name. ･...

  • Page 102: Using The X-Y Cont Recorder

    ──────────────────────────────────────────────────── 5.4 Using the X-Y CONT Recorder Set "Display Format" to the X-Y single or X-Y dual screen in the STATUS screen to perform X-Y waveform plotting. (1) The same operation as a normal recorder is available to plot between channels (real-time X-Y recording).

  • Page 103: Setting The Status Screen

    ──────────────────────────────────────────────────── 5.4.1 Setting the Status Screen (1) Setting the format 1. Press the key to display the STATUS screen. STATUS 2. Move the flashing cursor to the item. format 3. Use the function keys to make a setting. (See Section 5.3.5.) (2) Setting the interpolation 1.

  • Page 104: Setting The Display Screen

    ──────────────────────────────────────────────────── 5.4.3 Setting the Display Screen 1. Press the key to display the Waveform display DISP screen. 2. Press the key to make a setting. CH.SET ・Display clear setting (ON/OFF) ・Display setting (ON/OFF), X-axis and Y-axis setting ・Trigger setting ・A and B cursors setting s543 ────────────────────────────────────────────────────...

  • Page 105: Settings On The Waveform Display Screen (Rec)

    ──────────────────────────────────────────────────── 5.5 Settings on the Waveform Display Screen (REC) Explains the setting items on the Waveform display screen. For details on setting, refer to Section 5.3. When want to use the Jog/Shuttle control, press the select key. VALUE (The selection window is not displayed.) Setting items Selection Explanation...

  • Page 106: Start And Stop Operation (Rec)

    ──────────────────────────────────────────────────── 5.6 Start and Stop Operation (REC) Setting the 8841/42 See Section 5.3, "STATUS Settings", Chapter 9, "Input Channel STATUS Settings Settings", Chapter 10, "Trigger Functions." Channel Settings Trigger Settings Press the key and LED light. START Measurement start When the trigger can be registered, the indication "Waiting for trigger"...

  • Page 107: Chapter 6 Rms Recorder Function

    (1) The voltage value and DC signal for the commercial power supplies are displayed and recorded as the rms value. (2) Real time continuous recording (3) The 8841/42 is designed to measure commercial power supplies (50/60 Hz) and DC signal. (4) RMS accuracy: ±3%f.s.

  • Page 108: Operation Sequence (Rms)

    ──────────────────────────────────────────────────── (12) Additional recording function The first set of measurement data is preserved, and recording of the second set of measurement data starts after the first set. (13) Logging function Numeric printout of waveform data (14) Reprint function The most recent 2000 (32 M words: 10000) divisions of the data stored in memory can be printed as many times as required.
  • Page 109 ──────────────────────────────────────────────────── Setting the input channel (See Chapter 9) Settings on the channel screen Waveform display color Waveform display graph Voltage axis range Input coupling Logic input Magnification/compression along voltage Zero position Zero adjustment Offset cancel Low-pass filter Settings on the variable screen Variable function (See Chapter 9.7) Settings the advanced function Scaling function (See Chapter 9.8)

  • Page 110: Status Settings (Rms)

    ──────────────────────────────────────────────────── 6.3 STATUS Settings (RMS) Press the key to access the STATUS screen. This section explains STATUS how to set the STATUS screen of the RMS recorder function. See the corresponding sections for items that can be set in the Waveform display or CHANNEL screens.

  • Page 111: Setting The Function Mode

    ──────────────────────────────────────────────────── 6.3.1 Setting the Function Mode The 8841/42 has five function modes Select the RMS recorder function. Procedure Screen: STATUS, CHANNEL, Waveform display, TRIGGER 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the top position.

  • Page 112: Setting The Frequency

    ──────────────────────────────────────────────────── 6.3.3 Setting the Frequency Serves to set the frequency of the signal to be measured. Procedure Screen: STATUS 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the item. frequency 3. Use the function keys to make the selection. Function display Meaning...

  • Page 113: Setting The Display Layout

    ──────────────────────────────────────────────────── ･ The maximum recording length is 2000 divisions for a memory capacity of NOTE 8 M words or 10,000 divisions for 32 M words (with additional memory). ･ When the recording length is set to , the auto-saving is automatically CONT.
  • Page 114 ──────────────────────────────────────────────────── Quad graph Single graph Dual graph ･ Display and record as four ･ Display and record as two Display and record as one graph. graphs. (At the most, 16 analog graphs. (At the most, 16 analog (At the most, 16 analog + 16 + 8 logic signals) + 16 logic signals) logic signals)

  • Page 115: Setting The Print Mode

    ──────────────────────────────────────────────────── 6.3.6 Setting the Print Mode Select the format, waveform, or numerical value should be used to output measured data. The waveform is printed. Waveform The data spacing interval also must be set. Numerical value Procedure Screen: STATUS (1) Setting the printer format 1.

  • Page 116: Setting The Additional Recording Function

    ──────────────────────────────────────────────────── 6.3.7 Setting the Additional Recording Function This records, regarding the memory as though it were recording paper. The memory capacity of 8 M words can accommodate up to 2000 divisions of waveform data. With 32 M words (after optional memory expansion), waveform data of up to 10000 divisions can be saved.

  • Page 117: Setting The Printer Function (Real Time Printing)

    ──────────────────────────────────────────────────── 6.3.8 Setting the Printer Function (Real Time Printing) The input waveform is continuously printed in real time. Procedure Screen: STATUS 1. Press the key to display the STATUS screen. STATUS 2. Move the flashing cursor to the item. printer 3.
  • Page 118 : Data are stored as binary data. : Data are stored as text data. Data stored in the text format is not readable by the 8841/42. 6. When the data format to be saved is set to text data, the intermittent setting item is displayed.

  • Page 119: Settings On The Waveform Display Screen (Rms)

    ──────────────────────────────────────────────────── 6.4 Settings on the Waveform Display Screen (RMS) Explains the setting items on the Waveform display screen. For details on setting, refer to Section 6.3. When want to use the Jog/Shuttle control, press the select key.（The VALUE selection window is not displayed Setting items Selection Explanation...

  • Page 120: Start And Stop Operation (Rms)

    ──────────────────────────────────────────────────── 6.5 Start and Stop Operation (RMS) See Section 6.3, "STATUS Settings", Chapter 9, "Input Channel Setting the 8841/42 ･STATUS Settings Settings", Chapter 10, "Trigger Functions." ･Channel Settings ･Trigger Settings Press the key and LED light. START Measurement start When the trigger can be registered, the indication "Waiting for trigger"...

  • Page 121: Chapter 7 Recorder & Memory Function

    ──────────────────────────────────────────────────── Chapter 7 Recorder & Memory Function 7.1 Overview of the Recorder & Memory Function The recorder and memory function has the following features. (1) After being stored in the internal memory, input signal data can be displayed and printed. (2) All input channel data are recorded on the same time axis.

  • Page 122: Operation Sequence (Rec&Mem)

    ──────────────────────────────────────────────────── 7.2 Operation Sequence (REC&MEM) Preparation Installation of the Unit Turn on the power See Chapter 2 Connect the inputs Basic Settings Settings on the STATUS1 screen Function Select the recorder and memory function. Section 7.3 Time axis range Determine the speed with which the (Recorder/Memory input signal waveform is captured.
  • Page 123 ──────────────────────────────────────────────────── Setting the input channel (See Chapter 9) Settings on the channel screen Waveform display color Waveform display graph Voltage axis range Input coupling Logic input Magnification/compression along voltage Zero position Zero adjustment Offset cancel Low-pass filter Settings on the variable screen Variable function (See Chapter 9.7) Settings the advanced function Scaling function (See Chapter 9.8)

  • Page 124: Status Settings (Rec&Mem)

    ──────────────────────────────────────────────────── 7.3 STATUS Settings (REC&MEM) Press the key to access the STATUS1 screen. This section explains STATUS how to set the STATUS screen of the recorder and memory function. See the corresponding sections for items that can be set in the Waveform display or CHANNEL screens.

  • Page 125: Setting The Function Mode

    ──────────────────────────────────────────────────── 7.3.1 Setting the Function Mode The 8841/42 has five function modes. Select the Recorder and Memory functions. Procedure Screen: STATUS1, CHANNEL, Waveform display, TRIGGER 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the top position.

  • Page 126: Setting The Time Axis Range

    ──────────────────────────────────────────────────── 7.3.2 Setting the Time Axis Range Set the speed for inputting and storing the waveform of the input signal. Time axis range setting expresses the time for 1 DIV. The sampling period is 1/100th of the set value for the time axis range. (100 samples/DIV) (See Appendix 3) The sampling period for the sampling recorder is set by the memory.

  • Page 127: Setting The Recording Length

    ──────────────────────────────────────────────────── Combination of the recorder and memory time axis range. Vertical axis: time axis range of memory waveform (/DIV), horizontal axis: time axis range of recorder waveform (/DIV) 20ms 50ms 100ms 200ms 500ms 1min 2min 5min 10min 30min 1hour 100μs ●...

  • Page 128: Display Function

    ──────────────────────────────────────────────────── Procedure 2 Variable recording length mode 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the item. shot 3. To set the recording length, move the flashing cursor to either Recorder or Memory, according to which is to be set, and select ARBITRARY 4.

  • Page 129: Setting The Display Layout

    ──────────────────────────────────────────────────── 7.3.5 Setting the Display Layout ・The layout can be set for showing input signals on the screen display and recording them on the printer. ・The following layout is available: single, dual, quad, oct (Waveform display screen), hex（Print only, Display oct） . ・The voltage per division is automatically changed according to the display format.

  • Page 130: Setting The Print Mode

    ──────────────────────────────────────────────────── 7.3.6 Setting the Print Mode Select the format, waveform, or numerical value should be used to output measured data and calculation results. The smooth print function can be used, but print speed will Waveform decrease. The data spacing interval also must be set. Numerical value Procedure Screen: STATUS1...

  • Page 131: Setting The Additional Recording Function

    ──────────────────────────────────────────────────── 7.3.7 Setting the Additional Recording Function This records, regarding the memory as though it were recording paper. As waveforms captured by the recorder are stored in the unit's memory, this machine can be operated as a paper recorder. The memory capacity of 8 M words can accommodate up to 1000 divisions of waveform data.

  • Page 132: Setting The Printer Function (Real-Time Printing)

    ──────────────────────────────────────────────────── ･ Time values output to the printer and displayed on the screen with the NOTE additional recording function enabled are equal to those of the most recently acquired waveforms. Therefore, when measuring waveforms in a different time axis range, always take that difference into consideration. ･...

  • Page 133: Setting The Auto Save Function

    : Data are stored as binary data. : Data are stored as text data. Data stored in the text format is not readable by the 8841/42. 6. When the data format to be saved is set to text data, the intermittent setting item is displayed.
  • Page 134 ──────────────────────────────────────────────────── 7. Select the item to be stored. Function Meaning display : 1 block save of recorder data : 1 block save of memory data : All block save both recorder and memory data 8. Set the file name. For the input method, refer to Section 9.9.3. When using auto-save, a number is appended to the name you specify as the file name.

  • Page 135: Setting The Real-Time Save

    ──────────────────────────────────────────────────── 7.3.10 Setting the Real-Time Save Data can be saved to memory in real time, and afterwards compressed and stored on disk. Real-time save data is stored in binary format on the PC card or the internal MO drive. Trigger settings are not applicable to the memory waveform, and the start of Memory waveform recording coincides with the start of the Recorder waveform.
  • Page 136 ──────────────────────────────────────────────────── 5. Move the blinking cursor to "Memory Recording Length", and select using the jog control or function keys. Function g-ent,LOG1, 2 display Meaning : Move the cursor up in the selection window. : Move the cursor down in the selection window. s7311 ･...
  • Page 137 ──────────────────────────────────────────────────── ■Maximum Recording Time The maximum settable recording time is determined by the space available on the media, the MEM and REC time axes and the selected recording length. However, the maximum REC recording length is limited to 1000 DIV (5000 with expanded memory), so the recording time cannot be set beyond this limit regardless of space available on the media.
  • Page 138 ──────────────────────────────────────────────────── (3) With the REC time axis fixed at 1 h/DIV and any setting for the MEM time axis (compression rate: large) MEM time axis MEM recording REC time axis REC recording Maximum Recording length length Time 50 ms 639680 8 h, 53 m, 04 s 100 ms 319830...
  • Page 139 ──────────────────────────────────────────────────── ■Loading Real-Time Save Data To load data saved by Real-Time Save, load the index file (R_M). Data loaded by the index file consists of all recorder waveforms and the header (2000 DIV, or 10,000 DIV when expansion memory is installed) of the memory waveform.
  • Page 140 ──────────────────────────────────────────────────── 3. Specify the area to display as the memory waveform with the A-B cursors. 4. Use the function key to select the "LOAD". Function g-ent,LOG1, 2 display Meaning : Loads the memory waveform. s7311 Cursor A Memory waveform loads ■Memory Waveform Loading Example In the figure at the left, cursor A marks the starting point for Load starting point...

  • Page 141: Settings On The Waveform Display Screen (Rec&Mem)

    ──────────────────────────────────────────────────── 7.4 Settings on the Waveform Display Screen (REC&MEM) Explains the setting items on the Waveform display screen. For details on setting, refer to Section 7.3. When want to use the Jog/Shuttle control, press the select key.（The VALUE selection window is not displayed.) Pressing the F4 function key "REC&MEM"...

  • Page 142: Start And Stop Operation (Rec&Mem)

    ──────────────────────────────────────────────────── 7.5 Start and Stop Operation (REC&MEM) Setting the 8841/42 ･STATUS Settings See Section 7.3, "STATUS Settings", Chapter 9, "Input Channel ･Channel Settings Settings", Chapter 10, "Trigger Functions." ･Trigger Settings Press the key and LED light. START Measurement start Setting the trigger to Timer causes a delay until the set time.

  • Page 143: Chapter 8 Fft Function

    ──────────────────────────────────────────────────── Chapter 8 FFT Function 8.1 Overview of the FFT Function The FFT function has the following features. (1) FFT (Fast Fourier Transform) processing can be performed on input signal data for frequency analysis. (2) Frequency range 133 mHz to 400 kHz (3) Frequency resolution 1/400, 1/800, 1/2000, 1/4000 of frequency range (4) 12 types of analysis functions...

  • Page 144: Operation Sequence (Fft)

    ──────────────────────────────────────────────────── 8.2 Operation Sequence (FFT) Preparation Installation of the Unit Turn on the power See Chapter 2 Connect the inputs Basic Settings Settings on the STATUS1 screen Function Select the FFT function. FFT mode Select the using channels (1 channel Section 8.3 or 2 channels) STATUS...
  • Page 145 ──────────────────────────────────────────────────── Setting the input channel (See Chapter 9) Settings on the channel screen Waveform display color Voltage axis range Input coupling Magnification/compression along voltage Anti-aliasing filter Zero position Zero adjustment Low-pass filter Settings the advanced function Comment function (See Chapter 9.9) Setting the trigger function Trigger mode Trigger source...

  • Page 146: Status1 Settings (Fft)

    ──────────────────────────────────────────────────── 8.3 STATUS1 Settings (FFT) Press the key to access the STATUS1 screen. This section explains STATUS how to set the STATUS1 screen of the FFT function. See the corresponding sections for items that can be set in the Waveform display or CHANNEL screens.

  • Page 147: Setting The Function Mode

    ──────────────────────────────────────────────────── 8.3.1 Setting the Function Mode The 8841/42 has five function modes. Select the FFT function. Procedure Screen: STATUS1, CHANNEL, Waveform display, TRIGGER 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the top position.

  • Page 148: Setting The Frequency Range

    ──────────────────────────────────────────────────── 8.3.3 Setting the Frequency Range The frequency range (frequency axis maximum value) can be set as follows. The frequency range corresponds to the time axis range (TIME/DIV) setting of the memory function. Screen: STATUS1, Waveform display Procedure 1. Use the Menu keys to display the desired screen. 2.

  • Page 149: Fft Number Of Points Setup

    ──────────────────────────────────────────────────── 8.3.4 FFT Number of Points Setup This setting determines the sample count (Number of Points) used for FFT calculation. A higher setting increases the frequency analysis capability, but also increases the processing time required. Screen: STATUS1, Waveform display Procedure 1.

  • Page 150: Setting The Display Format

    ──────────────────────────────────────────────────── 4. If was selected, the coefficient item is displayed. Select the attenuation EXPO ratio in percent, using the function keys or the Jog/shuttle controls. If coefficient (attenuation ratio) is set to 0%, processing will be carried out as 0.1%. Function display Meaning...
  • Page 151 ──────────────────────────────────────────────────── 4. When the display format is set to single or dual, the item is displayed. peak Function display Meaning : OFF : Peak value : Maximum value Peak value display When data at one point are higher than data within the vicinity, the point is a peak.

  • Page 152: Selecting Reference Data

    ──────────────────────────────────────────────────── 8.3.7 Selecting Reference Data Select data to be used for FFT processing. Procedure Screen: STATUS1 1. Press the key to display the STATUS1 screen. STATUS 2. Move the flashing cursor to the item. reference 3. Use the function keys to make a setting. Function display Meaning...

  • Page 153: Setting The Fft Analysis Mode

    ──────────────────────────────────────────────────── 8.3.8 Setting the FFT Analysis Mode Used to select the FFT calculation method. Procedure Screen: STATUS1, Waveform display 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the item. FFT mode 3. Use the function keys to make a setting. Function Function display...

  • Page 154: Setting The X-Axis And Y-Axis Displays

    ──────────────────────────────────────────────────── 8.3.9 Setting the X-axis and Y-axis Displays Set the X and Y axis for display of FFT calculation results. Different units can be selected for the X and Y axis. With some FFT analysis modes, one of the axis cannot be set. When external sampling is used, the X-axis (horizontal axis) expresses the data count.
  • Page 155 ──────────────────────────────────────────────────── X and Y Axis Settings Available with each FFT Analysis Mode X-axis Y-axis FFT analysis mode (horizontal axis) (vertical axis) Storage Waveform (Time) (Linear) LIN-REAL LIN-IMAG LIN-Hz Linear Spectrum LIN-MAG LOG-Hz LOG-MAG PHASE LIN-REAL LIN-IMAG LIN-Hz RMS Spectrum LIN-MAG LOG-Hz LOG-MAG PHASE...

  • Page 156: Setting The Analysis Channel

    ──────────────────────────────────────────────────── 8.3.10 Setting the Analysis Channel Select the channel for FFT analysis. Procedure Screen: STATUS1, Waveform display 1. Use the Menu keys to display the desired screen. 2. Move the flashing cursor to the item. 3. Use the function keys or Jog/shuttle control, select the channel. Function display Meaning...

  • Page 157: Setting The Display Scale

    ──────────────────────────────────────────────────── 8.3.11 Setting the Display Scale The display scale for showing the FFT processing result can either be set manually or automatically. Procedure Screen: STATUS1 1. Press the key to display the STATUS1 screen. STATUS 2. Move the flashing cursor to the item.

  • Page 158: Octave Filter Setting

    ──────────────────────────────────────────────────── 8.3.12 Octave Filter Setting When octave analysis has been selected, two different filter types can be chosen. The characteristics of both filter types are within ANSI CLASS 3 tolerance limits (1/3 octave only). Procedure Screen: STATUS1 1. Select "octave analysis" in FFT analysis mode, and the item is octave filter shown.

  • Page 159: Status2 Settings (Fft)

    ──────────────────────────────────────────────────── 8.4 STATUS2 Settings (FFT) Press the key to access the STATUS2 screen. This section explains STATUS how to set the STATUS2 screen of the FFT function. See the corresponding sections for items that can be set in the Waveform display or CHANNEL screens.

  • Page 160: Setting The Averaging Function

    ──────────────────────────────────────────────────── 8.4.1 Setting the Averaging Function ・The averaging function allows capturing several instances of a waveform and determining the average. ・This makes it possible to eliminate noise and irregular signal components. ・Averaging for the time axis waveform and frequency axis waveform can be selected.
  • Page 161 ──────────────────────────────────────────────────── Frequency axis peak hold The specified number of samples are captured, and the peak value is held (stored) for each frequency. ･ For details on summing averaging and exponential averaging, refer to NOTE Appendix 3.6. ･ When averaging is used together with the waveform evaluation function, waveform evaluation is carried out after the specified averaging count is completed.
  • Page 162 ──────────────────────────────────────────────────── Averaging and trigger mode (1) Trigger mode: SINGLE 1. After the key was pressed, data are captured whenever the trigger START conditions are fulfilled, averaging is carried out, and then the waveform is displayed. Collected waveform data is averaged with the FFT time axis waveform and FFT processing is performed.

  • Page 163: Setting The Interpolation (Dot-Line)

    ──────────────────────────────────────────────────── (3) Trigger mode: AUTO (Time axis waveform) When the key is pressed, data are captured even if trigger conditions START are not fulfilled after a certain interval. If averaging is applied to unsynchronized input signals, the result will be meaningless. (Frequency axis waveform) 1.

  • Page 164: Setting The Print Mode

    ──────────────────────────────────────────────────── 8.4.3 Setting the Print Mode Select the format, waveform, or numerical value should be used to output FFT processing results. Procedure Screen: STATUS2 (1) Setting the printer format 1. Press the key to display the STATUS2 screen. STATUS 2. Move the flashing cursor to the item.

  • Page 165: Setting The Auto Save Function

    : Data are stored as binary data. : Data are stored as text data. Data stored in the text format is not readable by the 8841/42. 6. Set the file name. For the input method, refer to Section 9.9.3. When using auto-save, a number is appended to the name you specify as the file name.

  • Page 166: Setting The Waveform Evaluation

    ──────────────────────────────────────────────────── ･ File names consist of 8 characters (or 4 double-byte characters). With auto- NOTE save, since numbers are attached to the end of file names, long file names are truncated when this number is appended to the end of the file name. ･...

  • Page 167: Settings On The Waveform Display Screen (Fft)

    ──────────────────────────────────────────────────── 8.5 Settings on the Waveform Display Screen (FFT) Explains the setting items on the Waveform display screen. For details, refer to Sections 8.3 and 8.4. When want to use the Jog/Shuttle control, press the select key.（The VALUE selection window is not displayed.) Setting items Selection Explanation...

  • Page 168: Start And Stop Operation (Fft)

    When the key is pressed once during measurement, the STOP 8841/42 acquires measurement data in an amount corresponding to the set recording length, and the FFT analysis is carried, and then the measurement is stopped. (FFT analysis result, auto printout, auto save are executed.)

  • Page 169: Fft Analysis Function

    ──────────────────────────────────────────────────── 8.7 FFT Analysis Function 8.7.1 Storage Waveform [STR] Displays the time domain waveform of the input signal. Function Horizontal Time Time axis display cursor Indicates the value of the specified TIME/DIV frequency range. (Refer to the table of the frequency range and time axis in Section 8.3.3.) Vertical Linear...

  • Page 170: Linear Spectrum [Lin]

    ──────────────────────────────────────────────────── 8.7.2 Linear Spectrum [LIN] Displays the frequency domain waveform of the input signal, including magnitude and phase information. Major applications include: ・Determining the peaks of waveform frequency components ・Determining the levels of high and low harmonics Function Fa = (fa) = |Fa|exp(jθa) = |Fa|(cos ∠θa + jsin ∠θa)
  • Page 171 ──────────────────────────────────────────────────── Examples Linear spectra waveforms Y-axis: LIN-REAL (X-axis: LOG-Hz) Stored waveform Y-axis: LIN-IMAG (X-axis: LOG-Hz) Y-axis: LIN-MAG (X-axis: LOG-Hz) Y-axis: LOG-MAG (X-axis: LOG-Hz) Y-axis: PHASE (X-axis: LOG-Hz) Nyquist ──────────────────────────────────────────────────── 8.7 FFT Analysis Function...

  • Page 172: Rms Spectrum [Rms]

    ──────────────────────────────────────────────────── 8.7.3 RMS Spectrum [RMS] Displays the frequency domain waveform of the input signal, including magnitude (effective value) and phase information. The LOG-MAG displays of RMS spectrum and Power spectrum express the same processing result. Major applications include: ・Determining the peaks of waveform frequency components. ・Determining the effective values of frequency components.
  • Page 173 ──────────────────────────────────────────────────── 08-23, 30, 31, 32, 33, 34 Examples RMS spectra waveform Y-axis: LIN-REAL (X-axis: LOG-Hz) Stored waveform Y-axis: LIN-IMAG (X-axis: LOG-Hz) Y-axis: LIN-MAG (X-axis: LOG-Hz) Y-axis: LOG-MAG (X-axis: LOG-Hz) Y-axis: PHASE (X-axis: LOG-Hz) ──────────────────────────────────────────────────── 8.7 FFT Analysis Function...

  • Page 174: Power Spectrum [Psp]

    ──────────────────────────────────────────────────── 8.7.4 Power Spectrum [PSP] Displays the energy spectrum of the input signal, consisting of only magnitude information. Major applications include: ・Determining the peaks of waveform frequency components ・Determining the energy levels of high and low harmonics Function Gaa = Fa* ･...
  • Page 175 ──────────────────────────────────────────────────── Example Power spectra waveforms Stored waveform 08-23, 35, 36 Y-axis: LIN-MAG (X-axis: LOG-Hz) Y-axis: LOG-MAG (X-axis: LOG-Hz) Overall value Overall value The overall value is the total effective value obtained from the frequency spectrum contained in the input signal. It is obtained by taking the square root of the total of power spectra for all frequencies.

  • Page 176: Auto Correlation [Acr]

    ──────────────────────────────────────────────────── 8.7.5 Auto Correlation [ACR] Displays the degree of similarity between two points in the input signal separated by time difference (τ). Major applications: ・Detecting a periodic signal contained in a noisy signal with an improvement in signal-to-noise ratio. ・Checking the periodic signal components contained in a noisy waveform, and periodic noise.

  • Page 177: Histogram [His]

    ──────────────────────────────────────────────────── 8.7.6 Histogram [HIS] Displays the frequencies of the magnitudes of sampled points. Major applications include: ・Determining waveform imbalance ・Determining whether a waveform is artificial or natural from the waveform distribution (most natural waveforms are regular sine waves). Function Volt Linear display of the measurement range of the input unit.

  • Page 178: Transfer Function [Trf]

    ──────────────────────────────────────────────────── 8.7.7 Transfer Function [TRF] Displays the transfer function (frequency characteristics) of the system being measured calculated from input and output signals. Nyquist diagrams can also be displayed, including magnitude and phase information. Major applications include: ・Determining filter frequency characteristics. ・Determining feedback control system stability through Nyquist diagrams.
  • Page 179 ──────────────────────────────────────────────────── 8-40, 41, 42, 43, 44, 45,, Example Transfer function spectra waveform Stored waveform (input signal) Stored waveform (output signal) After bandpass filter Y-axis: LIN-REAL (X-axis: LOG-Hz) Y-axis: LIN-IMAG (X-axis: LOG-Hz) Y-axis: LIN-MAG (X-axis: LOG-Hz) Y-axis: LOG-MAG (X-axis: LOG-Hz) Nyquist Y-axis: PHASE (X-axis: LOG-Hz) ────────────────────────────────────────────────────...

  • Page 180: Cross Power Spectrum [Csp]

    ──────────────────────────────────────────────────── 8.7.8 Cross Power Spectrum [CSP] Displays the product of the spectra of two input signals. The magnitude and phase information of the frequency components that are common to both signals can be displayed. Major applications: Obtaining frequency components common to two signals. Function Gab = Fa*･Fb...
  • Page 181 ──────────────────────────────────────────────────── Example Cross power spectra waveforms Stored waveform 1 Stored waveform 2 Y-axis: LIN-REAL (X-axis: LOG-Hz) Y-axis: LIN-IMAG (X-axis: LOG-Hz) Y-axis: LIN-MAG (X-axis: LOG-Hz) Y-axis: LOG-MAG (X-axis: LOG-Hz) Nyquist Y-axis: PHASE (X-axis: LOG-Hz) ──────────────────────────────────────────────────── 8.7 FFT Analysis Function...

  • Page 182: Cross Correlation [Ccr]

    ──────────────────────────────────────────────────── 8.7.9 Cross Correlation [CCR] Displays the degree of similarity between two points separated by a time difference (τ) on two signals. The degree of similarity is expressed as a function of the time difference (τ). Major applications: ･ Obtaining the phase difference between two signals in time units. ･...

  • Page 183: Unit Impulse Response [Imp]

    ──────────────────────────────────────────────────── 8.7.10 Unit Impulse Response [IMP] Displays the frequency response of a system in the time domain. A response waveform equivalent to the unit impulse function is obtained by analyzing the input and output signals of the system being measured. Major applications Checking circuit time constants.

  • Page 184: Coherence [Coh]

    ──────────────────────────────────────────────────── 8.7.11 Coherence [COH] Displays the output signal component that is coherent (interference possible) to the input signal, yielding a value from 0 to 1. Major applications include: ・Evaluation of transfer functions. ・Determining the contribution of individual input lines to the output of multi-input systems.

  • Page 185: Octave Analysis [Oct]

    ・In analog octave analysis, the octave band center frequencies and filter characteristics are determined according to the ANSI CLASS 3 standard. In the 8841/42, the power spectrum is measured first and bundling is then used to perform 1/1-octave or 1/3-octave analysis. This allows the following...
  • Page 186 ──────────────────────────────────────────────────── Example Octave analysis waveforms Stored waveform 08-37, 59, 60 1/1 octave analysis 1/3 octave analysis ──────────────────────────────────────────────────── 8.7 FFT Analysis Function...
  • Page 187 ──────────────────────────────────────────────────── Frequency ranges and measurable range widths (0: 1/1 OCT, 1: 1/3 OCT) 0: 1/1 OCT, 1: 1/3 OCT Band No. Center 1.33 4 80 200 400 800 2k 8k 20k 40k 80k 200k400k frequency (Hz) 6.3 m 10 m 12.5 m 16 m 20 m...
  • Page 188 ──────────────────────────────────────────────────── 0: 1/1 OCT, 1: 1/3 OCT Band No. Center 1.33 4 80 200 400 800 2k 8k 20k 40k 80k 200k400k frequency (Hz) 1.6 k 2.5 k 3.15 k 6.3 k 10 k 12.5 k 16 k 20 k 25 k 31.5 k 40 k...

  • Page 189: Chapter 9 Input Channel Settings

    ──────────────────────────────────────────────────── Chapter 9 Input Channel Settings 9.1 Overview *1: Only voltage and current Item Screen Channel Display Status System measurement Waveform Display Color ● ● − − *2: Can be set on the 8938 and 8947 Measurement Range − − *3: 8939 only ●...

  • Page 190: Operation Procedure (Input Channel Setting)

    ──────────────────────────────────────────────────── 9.2 Operation Procedure (Input Channel Setting) Settings on the STATUS screen Function Memory recorder Recorder RMS recorder Recorder&memory Waveform display Single format Dual Quad X-Y single X-Y dual Waveform display color Settings on the Channel screen Waveform display graph Voltage axis range CHAN Pressing the...
  • Page 191 ──────────────────────────────────────────────────── Setting on the VARIABLE screen Use this function, if necessary. Variable function refers to a function that allows the arbitrary setting of voltage axis display range, freely expanding or compressing the voltage axis. For details see Section 9.7, "Setting the Variable Function". Setting on the SYSTEM screen SYSTEM 2: Scaling setting screen Using the scaling function, the output voltage from the sensors can...

  • Page 192: Setting The Channel Screen

    ──────────────────────────────────────────────────── 9.3 Setting the CHANNEL Screen Indicates the CHANNEL screen organization. Press the key to display CHAN the CHANNEL screen. CHANNEL screen VARIABLE screen Analog channel settings Variable function setting Channel 1 to 16 Channel 1 to 8 CHAN CH.SET See Section 9.7 Channel 9 to 16 Logic channel settings...

  • Page 193: Setting The Waveform Display Color

    ──────────────────────────────────────────────────── 9.3.1 Setting the Waveform Display Color Set the display color for the waveform. Procedure Screen: CHANNEL,Waveform display 1. Use the Menu keys to display the desired screen. 2. Press the key to display channel to be set. CH.SET 3. Move the flashing cursor to item.

  • Page 194: Setting The Voltage Axis Range

    ──────────────────────────────────────────────────── 9.3.3 Setting the Voltage Axis Range ・The measurement range for each channel is set. ・The set value denotes the voltage value for 1 DIV along the measurement range (vertically). Procedure Screen: CHANNEL,Waveform display 1. Use the Menu keys to display the desired screen. 2.

  • Page 195: Setting The Magnification/Compression Ratio Along The Voltage Axis

    ──────────────────────────────────────────────────── 9.3.5 Setting the Magnification/Compression Ratio Along the Voltage Axis Specifies the magnification/compression ratio for each channel to be used for ・ display and recording. Performs magnification/compression using the center of the screen as ・ reference. Procedure Screen: CHANNEL, Waveform display 1.

  • Page 196: Setting The Zero Position

    ──────────────────────────────────────────────────── 9.3.6 Setting the Zero Position The position of the zero voltage is set. Procedure Screen: CHANNEL,Waveform display 1. Use the Menu keys to display the desired screen. 2. Press the key to display channel to be set. CH.SET 3. Move the flashing cursor to the item.

  • Page 197: Setting The Low-Pass Filter

    ──────────────────────────────────────────────────── Single screen format ×1/2 ×1 ×2 ×5 ×10 2 to 16, X-Y 1,2 screen ×1/4 ×1/2 ×1 ×2.5 ×5 format No. of full-scale LSBs 3200 1600 Zero position adjustment area 0 to 100 -50 to 150 -150 to 250 -450 to 550 -950 to 1050 (MEM, REC, and REC&MEM)

  • Page 198: Setting The Logic Inputs

    ──────────────────────────────────────────────────── 9.3.8 Setting the Logic Inputs ・Select the display positions for CHA - CHD (1 probe). ・Select the display color for the logic waveform. Procedure Screen: CHANNEL, Waveform display Flashing cursor 1. Use the Menu keys to display the desired screen. Then press the key to display the logic CH.SET...

  • Page 199: Copying Channel Settings

    ──────────────────────────────────────────────────── 9.4 Copying Channel Settings ・Copies any of input channel settings (voltage axis range, input coupling, and low-pass filter), variable function settings, scaling function settings, or comment function settings to another channel. ・Copying channel settings cannot be carried out between different units. Procedure Screen: CHANNEL 1.

  • Page 200: Zero Settings

    ──────────────────────────────────────────────────── 9.5 Zero Settings 9.5.1 Zero Adjustment ・This function calibrates the 0 V position (ground position) to the selected zero position. Use it to assure precise results. ・Allow the unit to warm up for at least 30 minutes to ensure that the internal temperature of the input units has stabilized.

  • Page 201: Zero Offset Setup

    ──────────────────────────────────────────────────── 9.5.2 Zero Offset Setup This function offsets the input voltage measurement to 0 V to compensate for an actual non-zero input voltage. If the actual input voltage exceeds ±10 divisions, zero offset cannot be performed. This function is for the voltage and current measurement only.
  • Page 202 ──────────────────────────────────────────────────── ･ The zero offset function can be performed only for the input voltage NOTE measurement. ･ The input voltage will be set to 0V, so before executing zero offset setting, apply the signal that is to be offset to zero. ･...

  • Page 203: Channel Guide Function

    4. You can also check the status of CH2 to CH16. s7312 Set the channels of the 8946 4ch ANALOG UNIT (only for the 8841 unit). When the 8946 4ch ANALOG UNIT is used, input channels 1 to 4 are not set in this customary sequence on the 8841.

  • Page 204: Setting The Variable Function

    ──────────────────────────────────────────────────── 9.7 Setting the Variable Function The variable function allows the user to modify the waveform position and ・ size. The variable screen serves for setting the lower and upper limit of the ・ waveform display range. The allowable waveform display range between the upper and lower limits is ・...
  • Page 205 ──────────────────────────────────────────────────── Procedure Screen:VARIABLE 1. Press the key to display the VARIABLE screen. CHAN 2. Move the flashing cursor to the channel to be set. 3. Use the function keys to make a setting. Function display Meaning : Variable function is disabled. : Variable function is enabled.

  • Page 206: Scaling Function (System2)

    ──────────────────────────────────────────────────── 9.8 Scaling Function (SYSTEM2) ・The scaling function can be used to convert an output voltage from a sensor or similar into a physical quantity. ・The gauge scale (maximum and minimum values of vertical axis) and A･B cursor measurement values are displayed in the scaled units. ・Scaling can be performed for every channel.

  • Page 207: Setting The Scaling Function

    ──────────────────────────────────────────────────── 9.8.1 Setting the Scaling Function Procedure Screen: SCALING (SYSTEM2) (1) Selecting the scaling method 1. Press the key to display the scaling setting SYSTEM screen. 2. Move the flashing cursor to the position scaling kind 3. Use the function keys to make the selection. Function display Meaning...
  • Page 208 ──────────────────────────────────────────────────── (3) Entering the numerical value Method 1. Use the function key to select use num･key 2. Use the numerical input key to enter the numerical value. Conversion ratio method (conversion ratio: eu/v, offset) The setting range: -9.9999E+9 to +9.9999E+9. 2-point method (voltage value: volts, values after conversion: scale) The setting range: -9.9999E+29 to +9.9999E+29.
  • Page 209 ──────────────────────────────────────────────────── ■ Combination of the scaling and variable functions The scaling function can be combined with the variable function. When using the scaling and variable functions together: With variable auto-calibration off (refer to Section 12.2.16): Set the scaling first. If set in the sequence "Variable" → "Scaling," the upper and lower limits must be set with physical values after conversion in the variable settings (after scaling).

  • Page 210: Scaling Setting Example

    ──────────────────────────────────────────────────── 9.8.2 Scaling Setting Example The example below shows the scaling function of the strain unit. When a sensor (the conversion ratio is characterized as "3G = 1200 με(micro strain)") is used: Scaling method: 2-point method Setting: SCI or ENG Converting value: 1200 (με)→3 (scale), 0 (με)→0 (scale) unit (eu): G...

  • Page 211: Comment Function (System 3)

    ──────────────────────────────────────────────────── 9.9 Comment Function (SYSTEM 3) 9.9.1 Title Comment Entry Title comments of up to 40 characters can be included on the recording paper. Enabling title comment input prints the title on recording paper for all functions. "SET & COM" prints setup conditions (function, time axis range, magnification of time axis, and trigger time) along with the title.

  • Page 212: Analog/Logic Channel Comment Entry

    ──────────────────────────────────────────────────── 9.9.2 Analog/Logic Channel Comment Entry Comments of up to 40 characters can be included on the recording paper on each channel. If "COMMENT" or "SET & COM" is this comment selected, will be included on the recording paper in all functions. "SET &...

  • Page 213: Character Entry Procedure

    ──────────────────────────────────────────────────── 9.9.3 Character Entry Procedure The procedure for entering the characters for the comments, units, etc. is described. Procedure Screen: COMMENT (SYSTEM3) 1. Move the flashing cursor to the position in which you want to enter the comment. Move the flashing cursor to the desired position.
  • Page 214 ──────────────────────────────────────────────────── Comment Copy Procedure Screen: COMMENT (SYSTEM3) 1. Press the key to display the SYSTEM3 SYSTEM screen. 2. Move the flashing cursor to the channel for which you want to copy the comment. 3. Use the function keys or Jog/Shuttle control to select the channel to be copied.

  • Page 215: Setting The Waveform Display Screen

    ──────────────────────────────────────────────────── 9.10 Setting the Waveform Display Screen 9.10.1 Entering by CH.SET Key Pressing the key, enables the measurement conditions for each channel on CH.SET the Waveform display screen to be set or changed. It is possible to make the settings, while monitoring the waveforms in real time on the Waveform display screen.

  • Page 216: Setting The Vernier Function

    ──────────────────────────────────────────────────── 9.10.2 Setting the Vernier Function With the vernier function, input voltage can be minutely adjusted to the desired value. When recording various physical quantities using noise, temperature, and acceleration sensors, this vernier function allows you to adjust amplitudes to assist with calibration. For example, use the vernier function when you want to convert an input voltage of 1.2 V to 1.0 V and display the converted value.

  • Page 217: Direct Channel Setting

    2. Use channel-select keys CH1 to CH16 to select a channel. Only the channel associated with the input unit connected to the 8841/8842 can be selected. 3. The zero-position and voltage-axis range of the channel selected with the...

  • Page 218: Setting The 8937 Voltage/Temp Unit

    ──────────────────────────────────────────────────── 9.11 Setting the 8937 VOLTAGE/TEMP UNIT A common GND is used for voltage and temperature input on all WARNING channels. Never input voltage and temperature simultaneously, since doing so could result in damage to the sample being tested. ・Digital filter and drift compensation settings cannot be determined from NOTE the Waveform display or CHANNEL screen.
  • Page 219 ──────────────────────────────────────────────────── (2) Set the measurement range and digital filter. 1. Move the flashing cursor to the point shown in the Flashing cursor figure on the left. 2. Use the Jog/Shuttle control, the function keys or the knob to set the measurement range. RANGE Function Meaning...

  • Page 220: Making The Settings Of Temperature Measurement

    ──────────────────────────────────────────────────── 9.11.2 Making the Settings of Temperature Measurement Select the thermocouple type, drift correction and standard contact compensation to be used. Procedure Screen: CHANNEL,Waveform display (1) Set the measurement mode. 1. Display the CHANNEL or Waveform display screen. 2. Press the key to display the channel screen to CH.SET be set.
  • Page 221 ──────────────────────────────────────────────────── (3) Set the reference junction compensation. 1. Move the flashing cursor to the point shown in the figure on the left. 2. Use the function keys to make a setting. Function Flashing cursor g-rj1, rj2 display Meaning Reference junction compensation is performed internally by the 8937.(Measurement accuracy is the sum of the accuracy of temperature measurement plus reference junction compensation accuracy.)
  • Page 222 ──────────────────────────────────────────────────── ･ If ambient temperature changes suddenly, loss of thermal equilibrium can NOTE result in measurement error. When this occurs, allow the unit to acclimate to the new temperature for about one hour, then take measurements after thermal equilibrium is reached. ･...

  • Page 223: 8938 Fft Analog Unit

    ──────────────────────────────────────────────────── 9.12 8938 FFT ANALOG UNIT The 8938 FFT ANALOG UNIT contains an internal anti-aliasing filter required for FFT analysis. Enable the anti-aliasing filter when doing FFT analysis. Procedure Screen: CHANNEL,Waveform display Set the antialiasing filter. 1. Display the CHANNEL or Waveform display screen. 2.

  • Page 224: Setting The 8939 Strain Unit

    ──────────────────────────────────────────────────── 9.13 Setting the 8939 STRAIN UNIT For the channel to which the 8939 STRAIN UNIT is assigned, an auto balancing must be executed through the range setup menu. Auto balancing is a function by which the reference output level of the converter is adjusted to the specified zero position.

  • Page 225: 8940 F/V Unit

    ──────────────────────────────────────────────────── 9.14 8940 F/V UNIT The 8940 F/V UNIT can measure frequency, count, pulse duty ratio, voltage and current on each channel (with one measurement type per channel). See Section 9.3, "Setting the CHANNEL Screen" for the common settings. Frequency Obtains the frequency of the input pulse corresponding to the measured waveform.

  • Page 226: Frequency Measurement

    ──────────────────────────────────────────────────── 9.14.1 Frequency Measurement Select the measurement range. For the Frequency mode, three types of measurement can be performed depending on the measurement range. Frequency can be measured from 0.05 Hz to 5 kHz, RPM can be measured from 5 to 500 r/min, or commercial power can be measured at P50 or P60 Procedure Screen: CHANNEL, Waveform display (1) Set the measurement mode.
  • Page 227 ──────────────────────────────────────────────────── (3) Set the Hold function. 1. Move the flashing cursor to the position shown in the figure on the left. 2. Use the function keys to set. Flashing cursor Function display Meaning : The last value is displayed until the next frequency measurement is confirmed.
  • Page 228 ──────────────────────────────────────────────────── About Hold ON/OFF (1) Difference by ON and OFF of hold in stopping condition. For Frequency and RPM measurement, results are displayed after one confirmation cycle. When measuring phenomena such as stopping of a rotating body, if Hold is ON, stopping cannot be detected because there is no confirmation cycle.

  • Page 229: Setting The Count Mode

    ──────────────────────────────────────────────────── 9.14.2 Setting the Count Mode For count mode, the unit of measurement is 'c' (counts). Procedure Screen: CHANNEL, Waveform display (1) Set the measurement mode. 1. Display the CHANNEL or Waveform display screen. Flashing cursor 2. Press the key and move the flashing cursor to CH.SET desired channel.
  • Page 230 ──────────────────────────────────────────────────── (3) Set the pull-up resistance Set the pull-up resistance on or off. Pull-up resistance is used when connecting to an open collector output signal. For normal measurements, disable the pull-up resistance (set to OFF). Flashing cursor 1. Move the flashing cursor to the position shown in the figure on the left.

  • Page 231: Setting The Pulse Duty Ratio Mode

    ──────────────────────────────────────────────────── 9.14.3 Setting the Pulse Duty Ratio Mode The pulse duty ratio measures the ratio of single High pulses. Procedure Screen: CHANNEL, Waveform display (1) Set the measurement mode. 1. Display the CHANNEL or Waveform display screen. Flashing cursor 2. Press the key and move the flashing cursor to CH.SET desired channel.
  • Page 232 ──────────────────────────────────────────────────── (3) Set the threshold level. 1. Move the flashing cursor to the position shown in the figure on the left. 2. Use the function keys, or the Jog/Shuttle control to set the threshold value. Flashing cursor Function display Meaning : Increases in number, large step : Increases in number, small step : Decreases in number, small step...

  • Page 233: Setting The Voltage Mode

    ──────────────────────────────────────────────────── 9.14.4 Setting the Voltage Mode Procedure Screen: CHANNEL, Waveform display (1) Set the measurement mode. 1. Display the CHANNEL or Waveform display screen. 2. Press the key and move the flashing cursor to CH.SET Flashing cursor desired channel. 3. Move the flashing cursor to the item.
  • Page 234 ──────────────────────────────────────────────────── (3) Set the input coupling. 1. Move the flashing cursor to the position shown in the figure on the left. 2. Use the function keys or Jog/Shuttle control to select Flashing cursor the input coupling. Function display Meaning : DC coupling : AC coupling : The input signal is not connected.

  • Page 235: Setting The Current Measurement

    Up to four channels can be selected for current measurement at the same NOTE time on the 8841/42. However, the clamp check does not work correctly when more than four clamps are installed. Remove any extra clamps so that no more than four are installed before attempting the clamp check.

  • Page 236: Setting The 8947 Charge Unit

    ──────────────────────────────────────────────────── 9.15 Setting the 8947 CHARGE UNIT The 8947 CHARGE UNIT can measure either voltage or acceleration on each channel (one channel per measurement type). Refer to Section 9.3 "Setting the CHANNEL Screen" for the common settings. Charge Measures using charge-output type voltage acceleration pickup sensor Preamp Measures using internal-preamp type acceleration pickup sensor...

  • Page 237: Acceleration Measurement (Charge/Preamp) Selection

    ──────────────────────────────────────────────────── 9.15.1 Acceleration Measurement (Charge/Preamp) Selection When the PREAMP measurement mode is selected, voltage (15 V at 2 WARNING mA) is applied internally to the BNC connector when measurement starts. To avoid electric shock and damage to measurement objects, select a measurement mode other than PREAMP or turn the unit off when connecting a sensor or probe to the BNC terminals.
  • Page 238 ──────────────────────────────────────────────────── (3) Set the measurement range The measurement range varies according to sensor sensitivity. Set the sensor sensitivity before you set the measurement range. 1. Move the flashing cursor to the position shown in the Flashing cursor figure on the left. 2.

  • Page 239: Setting The Sensor Sensitivity

    ──────────────────────────────────────────────────── 9.15.2 Setting the Sensor Sensitivity Sensor sensitivity is set in meters-per-second squared (m/s ) units. However, some acceleration sensors use G (gravitational constant) units, in which case the read value should be divided by 9.8 (m/s Example 1 If specified sensor sensitivity is written as 1.08 (pC/(m/s sensor sensitivity level should be set to 1.08.

  • Page 240: Setting The Voltage Measurement

    ──────────────────────────────────────────────────── 9.15.3 Setting the Voltage Measurement Procedure Screen: CHANNEL, Waveform display (1) Set the measurement mode. 1. Display the CHANNEL or Waveform display screen. 2. Press the key and move the flashing cursor to CH.SET Flashing cursor desired channel. 3. Move the flashing cursor to the item.

  • Page 241: Chapter 10 Trigger Functions

    ──────────────────────────────────────────────────── Chapter 10 Trigger Functions 10.1 Overview of the Trigger Functions ･ The term "trigger" refers to a signal which is used to control the timing for recording start or stop. ･ The term "triggering has occurred" refers to the state when such a signal has activated recording start or stop.

  • Page 242: Operation Sequence (Trigger Mode Setting)

    ──────────────────────────────────────────────────── 10.2 Operation Sequence (Trigger mode setting) Setting trigger mode START SINGLE Trigger is registered only once. After was pressed, unit starts waveform recording when triggering occurs and continues for preset recording This determines whether the trigger is length. Measurement then ends automatically. accepted repeatedly after once REPEAT Trigger is registered continuously.
  • Page 243 ──────────────────────────────────────────────────── Selecting trigger type Analog trigger ･ The analog signal input channels can be used as trigger source. ･ The type of trigger that can be used for the various functions is limited. Level trigger (MEM, REC, REC&MEM, FFT) Triggering occurs when the input signal crosses the Trigger level preset trigger level (voltage) with the preset trigger slope ( ,...

  • Page 244: Trigger Screen Organization

    ──────────────────────────────────────────────────── 10.3 TRIGGER Screen Organization Indicates the TRIGGER screen organization. Press the key to display TRIG the TRIGGER screen. Setting items: ・Trigger mode ・Pre-trigger (for recorder function, trigger timing) ・Trigger source ・Manual trigger ・Analog trigger  (channels 1 to 16) s83-1, 2 CH.SET TRIG Setting items...

  • Page 245: Trigger Mode

    ──────────────────────────────────────────────────── 10.4 Trigger Mode The trigger mode determines the way triggering is used to control operation of the unit. When all trigger sources are OFF, a recording operation begins immediately (free-run operation). Procedure Screen: TRIGGER, Waveform display 1. Display the TRIGGER or Waveform display screen. Flashing cursor 2.

  • Page 246: Pre-Trigger

    ──────────────────────────────────────────────────── 10.5 Pre-trigger The pre-trigger function serves to record the waveform not only after but also before triggering has occurred. Memory Recorder, Recorder&Memory, and FFT Functions In the memory recorder function, recorder&memory, and FFT Functions, using the recording start point as 0% and the recording end point as 100%, the trigger point can be specified in percent.
  • Page 247 ──────────────────────────────────────────────────── RMS Recorder Function In the RMS recorder function, using the recording start point as 0 DIV, the trigger point can be specified in DIV (0, 5, 10 DIV). When all trigger sources are set to OFF, the pre-trigger setting is invalid. Procedure Screen: TRIGGER, Waveform display 1.

  • Page 248: Trigger Timing (Rec Only)

    ──────────────────────────────────────────────────── 10.6 Trigger Timing (REC only) ・The moment the trigger occurs, the time related to the waveform being recorded can be set. ・Not only the waveform after the trigger but also the waveform before the trigger can be recorded. Procedure Screen: TRIGGER 1.

  • Page 249: Trigger Source And/Or Linking

    ──────────────────────────────────────────────────── 10.7 Trigger Source AND/OR Linking The analog trigger, logic trigger, external trigger, and timer trigger can be linked with the AND/OR logical operators. OR: Triggering occurs when conditions for one trigger are met. AND: Triggering occurs when conditions for all triggers are met. Procedure Screen: TRIGGER 1.

  • Page 250: Analog Trigger

    ──────────────────────────────────────────────────── 10.8 Analog Trigger The analog signal input channels can be used as trigger source. The type of trigger that can be used for the various functions is limited. Available trigger types for each function Function Memory Recorder& Recorder Trigger recorder recorder Memory...
  • Page 251 ──────────────────────────────────────────────────── Procedure Screen: TRIGGER, Waveform display (1) Select the level trigger 1. Display the TRIGGER or Waveform display screen. 2. Move the flashing cursor to position 1. shown in the figure. 3. Use the function keys to select LEVEL (2) Set the trigger level 1.
  • Page 252 ──────────────────────────────────────────────────── Settings on the Waveform display screen Operation Setting items Function Jog/Shuttle 1. Trigger mode ● − 2. Trigger type ● − 3. Channel ● ● 4. Trigger level ● ● 5. Trigger slope ● − 6. Pre-trigger ● ● Restriction: The trigger filter cannot be set.

  • Page 253: Window Trigger

    ──────────────────────────────────────────────────── 10.8.2 Window Trigger Window-In Trigger Set upper limit level and lower limit level and activated when the input signal enters the range between these limits. Window-Out Trigger Set upper limit level and lower limit level and activated when the input signal leaves this range.
  • Page 254 ──────────────────────────────────────────────────── (3) Set the trigger filter 1. Move the flashing cursor to position shown in the figure on the left. 2. Use the Jog/Shuttle control or the function keys to make the selection. In the Memory recorder, Recorder& Memory, FFT Functions Trigger filter is disabled Trigger filter is enabled.

  • Page 255: Voltage Drop Trigger

    ・The time axis ranges that can be used are 100μs to 50 ms/DIV. In FFT function, 800 Hz to 400 kHz of the frequency axis range. ・The 8841/42 is designed to measure commercial power supplies (50/60 Hz), and detects momentary voltage drops in commercial power supplies.
  • Page 256 ──────────────────────────────────────────────────── Settings on the Waveform display screen Operation Setting items Function Jog/Shuttle 1. Trigger mode ● − 2. Trigger type ● − 3. Channel ● ● 4. Trigger level ● ● 5. RMS value − − 6. Pre-trigger ● ● Restriction: The frequency cannot be selected.

  • Page 257: Period Trigger

    ──────────────────────────────────────────────────── 10.8.4 Period Trigger This function sets both the period reference voltage and the period range, and measures the rise (fall) period of the reference voltage. When the measured period deviates from the specified range, triggering occurs. Procedure Screen: TRIGGER, Waveform display (1) Select the period trigger.
  • Page 258 ──────────────────────────────────────────────────── (4) Set the reference voltage value 1. Move the flashing cursor to position shown in the figure. 2. Use the Jog/Shuttle control or the function keys to make the setting. Function #7-3 display Meaning : Increases in number, large step : Increases in number, small step : Decreases in number, small step : Decreases in number, large step...
  • Page 259 ──────────────────────────────────────────────────── Triggering position of the period trigger The system monitors the period of the signal that crosses the set reference voltage. When the monitored period deviates from the set range, triggering occurs. The trigger position is determined by the set period range and the measurement signal period.

  • Page 260: Rms Level Trigger

    ──────────────────────────────────────────────────── 10.8.5 RMS Level Trigger ・The commercial power supplies, 50/60 Hz and the DC signals can be measured. ・This trigger occurs when the input signal crosses a predetermined trigger level (rms value) in a particular direction ("slope": Trigger point Trigger point Input signal Trigger level Trigger level...
  • Page 261 ──────────────────────────────────────────────────── ･ Set the frequency of the measuring object on the STATUS screen. NOTE ･ 'AND' cannot be set between the trigger sources using the RMS level trigger and the logic trigger. When a shift is made from "OR" to "AND," the logic trigger setting is turned OFF.

  • Page 262: Logic Trigger

    ──────────────────────────────────────────────────── 10.9 Logic Trigger ・The signal of a logic channel can be used as trigger source. ・A trigger pattern and logical operator (AND/OR) are specified, and triggering occurs when the trigger conditions are met. ・A trigger filter can be specified, so that triggering occurs only when the trigger conditions are met within the filter width.
  • Page 263 ──────────────────────────────────────────────────── (3) Set the trigger pattern 1. Move the flashing cursor to position 2. Select 1 - 4 with the function key display. Make the setting with the function keys. Function display Meaning : Signal disregarded : Low level signal : High level signal ･...

  • Page 264: External Trigger Function

    GND terminal or applying a falling edge signal going below 2.5 V. ・The external trigger facility can be used to synchronize a number of the 8841/42 units for parallel operation. ・For details for connection, refer to 17.1. External trigger terminal...

  • Page 265: Timer Trigger Function

    ──────────────────────────────────────────────────── 10.11 Timer Trigger Function ・This function serves to activate recording at preset times. ・Triggering can be performed at constant intervals within a preset start time and end time. Time interval Time interval Start time End time Procedure Screen: TRIGGER (1) Set the timer trigger.
  • Page 266 ──────────────────────────────────────────────────── Note on use for the timer trigger (1) Set the present time on the SYSTEM screen first, then set the timer trigger. (2) Set the start time and end time to a point after the pressing of the START key.
  • Page 267 ──────────────────────────────────────────────────── Relation between timer trigger and AND/OR linking When trigger sources are set to OR: All trigger sources are valid. If other trigger sources have been set, triggering can also occur before the start time or after the end time. Invalid (overlaps with recording) Measurement start Level trigger...

  • Page 268: Manual Trigger

    : Manual trigger is enabled. s812 10.13 Trigger Output Terminal ・When triggering occurs, a signal is output from the TRIG OUT terminal. ・This can be used to synchronize several 8841/42 units. ・For details, see Section 17.1.3. Trigger output terminal Pressing the...

  • Page 269: Chapter 11Waveform Display Screen Operation

    ──────────────────────────────────────────────────── Chapter 11 Waveform Display Screen Operation Indicates the Waveform display screen operation. Setting the Input channel To set a numerical value using the Jog/Shuttle control on the Waveform display screen, press the VALUE select key.（The selection window is not displayed.) Pressing the CH.SET key, enables the measurement conditions for each channel on the Waveform display screen to be set or changed.

  • Page 270: Scrolling The Waveform

    ──────────────────────────────────────────────────── 11.1 Scrolling the Waveform The waveform on the display can be scrolled horizontally. Procedure Screen: Waveform display 1. Press the select key. WAVE 2. Use the Jog/Shuttle control to scroll the waveform Auto-scroll If turning the the Shuttle control fully and holding the control for about five seconds, the indication "auto scroll"...

  • Page 271: Using The A･B Cursors

    ──────────────────────────────────────────────────── 11.2 Using the A･B Cursors The A･B cursors can be used to read a time difference, frequency, or potential difference on screen. (When scaling is used, the difference is displayed in the scaling value. See Section 9.8.) Line Cursor (vertical, horizontal) The value at cursor A and cursor B, and the value between the two cursors can be determined.

  • Page 272: Using The Line Cursors (Vertical)

    ──────────────────────────────────────────────────── 11.2.1 Using the Line Cursors (Vertical) The line cursor (vertical) displays the time and period starting from the trigger position. On the recorder, the line cursor (vertical) displays the time and period starting from the initiation of recording. Procedure Screen: Waveform display 1.

  • Page 273: Using The Line Cursors (Horizontal)

    ──────────────────────────────────────────────────── 11.2.2 Using the Line Cursors (Horizontal) Used to read a voltage value of the specified channel. A･B cursor can be specified a different channel. Procedure Screen: Waveform display 1. Move the flashing cursor to the item cursor 2. Use the function keys to select the Line cursor (horizontal).

  • Page 274: Using The Trace Cursors

    ──────────────────────────────────────────────────── 11.2.3 Using the Trace Cursors Used to read the value at point where the cursor crosses the waveform of the specified channel. A･B cursor can be specified a different channel. Procedure Screen: Waveform display 1. Move the flashing cursor to the item cursor 2.
  • Page 275 ──────────────────────────────────────────────────── ･ When the select key is used to activate the A･B cursor mode, the A･B CSR NOTE trace cursor can be used, also if it was set to OFF. ･ Trace cursor can not be used on the X-Y CONT recorder. ･...

  • Page 276: Using The A･B Cursors (X-Y Screen)

    ──────────────────────────────────────────────────── 11.2.4 Using the A･B Cursors (X-Y Screen) The cursor can be used on the X-Y screen. Partial X-Y plotting enables operation of the A･B cursors. Procedure Screen: X-Y Waveform display 1. Move the flashing cursor to the item cursor 2.

  • Page 277: Magnification/Compression Ratio Along The Time Axis

    ──────────────────────────────────────────────────── 11.3 Magnification/compression Ratio Along the Time Axis ・The magnification/compression ratio along the time axis can be set. ・By magnifying the waveform, detailed observations can be made. By compressing the waveform, an entire change can be promptly apprehended. ・Magnification/compression of the screen uses the left edge as reference, regardless of the status of the A･B cursor.

  • Page 278: Zoom Function (Mem Only)

    ──────────────────────────────────────────────────── 11.4 Zoom Function (MEM only) This function divides the memory recorder function display screen into upper and lower windows, so that the regular-size waveform is displayed in the upper window and the waveform enlarged in the time axis direction is displayed in the lower window.

  • Page 279: Input Level Monitor Function

    ──────────────────────────────────────────────────── 11.5 Input Level Monitor Function ・The levels of all input waveforms can be monitored in real time. ・Levels are displayed separately for CH1 - CH16 and logical CHA - CHD. ・To select the input channel, use the key. See Section 9.10. CH.SET ・The level monitor function can not be used in RMS record function during measurement.

  • Page 280: View Function (View Key)

    ──────────────────────────────────────────────────── 11.6 View Function (VIEW key) 11.6.1 Position Display Indicates the position of the currently displayed waveform within the entire recording length. The trigger time, trigger position and A･B cursor position are displayed when using the vertical or trace cursors. There is no particular view for the FFT function.

  • Page 281: Block Display (Mem Only)

    ──────────────────────────────────────────────────── ･ While the view function is active, the flashing cursor is not displayed and NOTE the settings cannot be changed. ･ Even during measurement, the position of the waveform can be displayed by pressing the key. VIEW ･ When the view function is displayed, settings with the key are CH.SET disabled.
  • Page 282 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 11.6 View Function (VIEW key)

  • Page 283: Chapter 12 System Screen Settings

    ──────────────────────────────────────────────────── Chapter 12 SYSTEM Screen Settings 12.1 Overview The SYSTEM screen serves to set the following items which are common to all functions. SYSTEM 1 Channel used SYSTEM 4 Output destination Start backup function by the COPY key SET UP INTERFACE Back light saver function Output destination...

  • Page 284: Set Up Screen (System 1)

    Settings for the use channel are displayed only when the Memory recorder NOTE function has been set. For the 8841, if the 8946 4ch ANALOG UNIT is not connected, "ch1-8" is set after system reset. ──────────────────────────────────────────────────── 12.2 SET UP Screen (SYSTEM 1)

  • Page 285: Start Backup

    (while the key LED START is lit), and then the power supply is restored, the 8841/42 goes back into the measurement operation mode, and recording is restarted immediately. ・If the trigger function is used, the unit goes into trigger standby mode.

  • Page 286: Display Color

    ──────────────────────────────────────────────────── 12.2.4 Display Color ・Serves to set the display color. ・The display color can be selected from among the display colors 1 to 8 and the customer color 9 which can be set as desired. Function display Meaning : Increase the color number. : Decrease the color number.

  • Page 287: Display Language

    ──────────────────────────────────────────────────── 12.2.6 Display Language Serves to set the display language. Function Meaning display : Displays in Japanese. : Displays in English. 12.2.7 Grid Type ・Selects the type of grid shown on the Waveform display screen and drawn on the recording paper. ・On the Waveform display screen, the standard and fine grids are defined as the standard, and the standard (dark) and fine (dark) grids are defined as the standard (dark) grids.

  • Page 288: Time Value

    ──────────────────────────────────────────────────── 12.2.9 Time Value The time from the trigger point and other information can be printed. Function display Meaning : Displays the time from the trigger point (unit: fixed) : Displays the time from the trigger point (unit: base 60). : Displays the number of DIV from trigger point.

  • Page 289: Position Comment

    ──────────────────────────────────────────────────── 12.2.13 0 Position Comment In waveform printing, comments are printed out in the zero position of each channel. This comment printing is valid only for the analog channels. Comments can be set on SYSTEM3 (COMMENT) screen. Function display Meaning : 0 position comment is not used.

  • Page 290: Variable Auto Calibration

    ──────────────────────────────────────────────────── 12.2.16 Variable Auto Calibration This automatically calibrates the variable settings in conjunction with changes to the scaling and voltage axis range settings. Function Meaning display The variable settings are not changed even if the scaling or voltage axis range settings are altered.

  • Page 291: Comment Screen (System 3)

    ──────────────────────────────────────────────────── 12.4 COMMENT Screen (SYSTEM 3) Three types of comment are available. If " this comment will be included COMMENT" or "SET & COM" is selected, on the recording paper in all functions. (1) Title comment input Title comments of up to 40 characters can be included on the recording paper.

  • Page 292: Interface Screen (System 4)

    ──────────────────────────────────────────────────── 12.5 INTERFACE Screen (SYSTEM 4) Procedure Screen: INTERFACE (SYSTEM4) 1. Press the key or function key to display the SYSTEM INTERFACE screen. 2. Move the flashing cursor to set the item. 3. Use the function keys to make the selection. Interface Setting Screen s105 CH.SET key...

  • Page 293: Output Destination By The Copy Key

    ──────────────────────────────────────────────────── 12.5.1 Output Destination by the COPY Key The screen data output destination when the key is pressed and the the COPY color of the output destination can be specified. ･ When the output destination is specified other than internal and external NOTE printers and the color of output destination is set to monochrome, the screen is displayed in monochrome while data saving is in progress.

  • Page 294: Setting The Scsi Id

    4. Therefore, if the internal MO drive has been mounted, the ID number 4 cannot be specified. The available value range is 0 to 7. ･ Do not set the SCSI ID of the 8841/42 and target to the same number. NOTE ･...

  • Page 295: Setting The Lan

    When using the HIOKI 9333 LAN COMMUNICATOR, you can remotely control the 8841 or 8842 on a PC or use the Auto Save function to save 8841/42 data on a PC via the 9333. For details, refer to the instruction manual provided with the 9333.
  • Page 296 2. Select the language to display (click the English icon). 3. Click [INTERFACE MANUAL]. 4. Click the icon for your model. (2) Compatible LAN Card The LAN cards below are compatible with the 8841/42. (As of April 2003) HIOKI 9578 10BASE-T LAN CARD *1 NETGEAR FA411 For the latest information, visit the HIOKI website.
  • Page 297 __X (default: 880X) (Specify the three leftmost digits of the four digits. Numbers 0 to 9 in the least significant digit are used by the 8841/42 or reserved. Specify the port No. when default numbers 8800 to 8809 are not available.)
  • Page 298 When DHCP is ON and a DHCP server is running on the same network, the 8841/42 obtains its IP address and subnet mask, then is automatically set up. Any available DNS and gateway information are also obtained. (The information obtained from DHCP has priority over manually entered settings.)
  • Page 299 When the PC is on the same network, use the default gateway of the PC. When the 8841/42 is connected one-to-one with a PC or both are connected to the same hub, a gateway is not necessary. Turn it off.
  • Page 300 (default) of the 8841/42 using TCP and sending a character string. FTP User Name and Password Used for authentication when logging into FTP of the 8841/42. When a user name and password are set, you cannot log in unless the user name and password are correct.
  • Page 301 After completing the setting above, connect the devices. Connecting the 8841/42 to an existing network Connect the LAN connector of the 8841/42 to the hub using a straight LAN cable or the 9642 LAN cable. Connecting the 9941/42 to a PC one-to-one A cross cable or straight cable and a cross connector are required.

  • Page 302: Initialize Screen

    ──────────────────────────────────────────────────── 12.6 INITIALIZE Screen Procedure Screen: INITIALIZE (SYSTEM5) 1. Press the key to display the INITIALIZE SYSTEM screen. 2. Move the flashing cursor, want to set the item. 3. Use the function keys to make the selection. TIME SET See Section 12.6.1 WAVE DATA CLEAR See Section 12.6.2 SYSTEM RESET...

  • Page 303: System Reset

    (exec) NOTE The 8946 4ch ANALOG UNIT is designed for use with the 8841. If this channel is used with the 8842 powered on, "ERR" appears in the opening screen, indicating that the position at which the channel is connected is incorrect, while the system configuration list screen displays "none."...

  • Page 304: Self-Check

    3. Use the function keys to make the selection. s-107 12.7.1 ROM/RAM Check ・This test checks the internal memory (ROM and RAM) of the 8841/42. ・The test is non-destructive; it does not affect the contents of RAM. ・The result is displayed as follows. OK: Passed, NG: Failed...

  • Page 305: Display Check

    ──────────────────────────────────────────────────── 12.7.3 Display Check ・This test checks the display. ・Two check patterns (solid-color display check and gradation check) are available. Procedure 1. Move the flashing cursor to the item. DISPLAY CHECK 2. Press the function key to check the display. (exec) Press any key to move to the next check.
  • Page 306 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 12.7 Self-check...

  • Page 307: Chapter 13 Printout Of Measurement Data

    ──────────────────────────────────────────────────── Chapter 13 Printout of Measurement Data Waveform data can be printed out in two formats: waveform or numeric. Seven different procedures can be used to print out the measured waveforms. On the printer, the print density can be changed in five steps. Print mode Setting the Smooth printing Waveform...

  • Page 308: Printout Of Measurement Data Operating Procedure

    ──────────────────────────────────────────────────── 13.1 Printout of Measurement Data Operating Procedure Settings on the STATUS screen Single Display and record as one graph. Display format (16 analog + 16 logic signals max.) Dual Display and record as two graphs. (16 analog + 16 logic signals max.) Quad Display and record as four graphs.
  • Page 309 ──────────────────────────────────────────────────── Settings on the SYSTEM screen SETUP Grid type Channel marker Time value List & Gauge SYSTEM Press the key to make the Printer density settings on the SYSTEM screen. Upper-lower print 0 position comment Counter print SCALING The printout will use the scaled gauge. See Section 9.8.

  • Page 310: Setting The Status Screen (Printout)

    ──────────────────────────────────────────────────── 13.2 Setting the STATUS Screen (printout) 13.2.1 Setting the Display Format ・The style can be set for showing input signals on the screen display and recording them on the printer. ・The styles single, dual, quad, oct (Waveform display screen), hex (Print only, Display oct style) X-Y single, X-Y dual (dot/line) are available.

  • Page 311: Setting The Print Mode

    ──────────────────────────────────────────────────── 13.2.2 Setting the Print Mode Select the format, waveform, or numerical value should be used to output measured data and calculation results. The smooth print function can be used, but print speed will Waveform decrease. (MEM, memory waveform in REC&MEM) The data spacing interval also must be set.

  • Page 312: Setting The Channel Screen (Printout)

    ──────────────────────────────────────────────────── 13.3 Setting the CHANNEL Screen (printout) 13.3.1 Setting the Print Density If the data is to be output on the internal printer, any of four print densities may be set for twelve waveform display colors. The set print density determines waveform density on printouts or hard copies.

  • Page 313: Setting The Waveform Display Graph Position

    ──────────────────────────────────────────────────── 13.3.2 Setting the Waveform Display Graph Position Set which graph type to use when display format has been set to DUAL, QUAD, OCT or HEX screen display on the STATUS screen. Procedure Screen: CHANNEL 1. Press the key to display the CHANNEL screen. CHAN 2.

  • Page 314: Setting The System Screen (Printout)

    ──────────────────────────────────────────────────── 13.4 Setting the SYSTEM Screen (printout) 13.4.1 SET UP Screen (SYSTEM 1) Procedure Screen: SETUP (SYSTEM1) 1. Press the key to display the SET UP screen. SYSTEM 2. Move the flashing cursor to desired item. 3. Use the function keys to make the selection. For details, see Section 13.5.
  • Page 315 ──────────────────────────────────────────────────── Time Value The time from the trigger point and other information can be printed. Function gc-tm1, 2, 3, 4 display Meaning : Displays the time from the trigger point (unit: fixed). : Displays the time from the trigger point (unit: base 60). : Displays the number of DIV from trigger point.

  • Page 316: Scaling Screen (System 2)

    ──────────────────────────────────────────────────── 0 position In waveform printing, comments are printed out in the zero position of each Comment channel. This comment printing is valid only for the analog channels. Comments can be set on SYSTEM3 (COMMENT) screen. Function display Meaning : 0 position comment is not used. : 0 position comment is used.

  • Page 317: Setting The Output Destination By The Copy Key

    ──────────────────────────────────────────────────── 13.4.4 Setting the Output Destination by the COPY Key To output data with the 8841/8842 printer, set destination to "Internal Printer". When the external printer, see Section 13.7, "External Printer". Procedure Screen: INTERFACE (SYSTEM4) 1. Press the key or function key to display the SYSTEM INTERFACE screen.

  • Page 318: Setting The Output Destination By The Print Key

    ──────────────────────────────────────────────────── 13.4.5 Setting the Output Destination by the PRINT Key To output data with the 8841/8842 printer, set destination to "Internal Printer". To use the external printer to output, see Section 13.7, "External printer." Procedure Screen: INTERFACE (SYSTEM4) 1. Press the...
  • Page 319 ──────────────────────────────────────────────────── ・ Setting the indent width (when external printer setting) When the output destination is set to external printer, and data is printed in the ×1.0 setting, the top of the waveforms may not be printed by some printers. In this case, set the size to ×0.8. However, if you would still like to print in the ×1.0 setting, adjust the indent width between 0 and 10 mm to print either the upper or lower portion, whichever you consider more important.

  • Page 320: Example Of Printer Output

    ──────────────────────────────────────────────────── 13.5 Example of Printer Output This section explains the printer type and how to read the printout (in the case of a SINGLE format display screen). MEMORY  100μs/DIV( 100μs ×1) Trig：'98-02-20 12:00:00    ［HIOKI 8841 COMMENT ］ 500μs 1.5ms ［ V］...
  • Page 321 ──────────────────────────────────────────────────── Advanced settings '98 - 02 - 20 - 0017 HIOKI 8841 MEMORY HiCORDER 2.5ms Upper １： ２： ch2 COMMENT ch1COMMENT ch1 COMMENT ch2 COMMENT chA1 COMMENT chA2 COMMENT Lower chA3 COMMENT ＣＨ１ -7 V １： chA4 COMMENT ＣＨ２ -4 V ２：...
  • Page 322 ──────────────────────────────────────────────────── Printing the List (MEM) ＨＩＯＫＩ ８８４１ＭＥＭＯＲＹ ＨｉＣＯＲＤＥＲ Trig‑time： ９８-０９-２３ １２:００:００ STATUS SYSTEM Function：  MEMORY Use channel：     ch1‑16 Grid type：     STANDARD Memory div：      OFF Time/DIV：  100μs Start back up：      OFF Channel maker：  COMMENT Back light saver：    OFF Time value：     TIME Averaging：     Shot：     ...
  • Page 323 ──────────────────────────────────────────────────── Dual Screen 115-1,2 Quad Screen ──────────────────────────────────────────────────── 13.5 Example of Printer Output...
  • Page 324 ──────────────────────────────────────────────────── Oct Screen s115-3,4 Hex Screen ──────────────────────────────────────────────────── 13.5 Example of Printer Output...
  • Page 325 ──────────────────────────────────────────────────── X-Y Single Screen 115-5,6 X-Y Dual Screen ──────────────────────────────────────────────────── 13.5 Example of Printer Output...
  • Page 326 ──────────────────────────────────────────────────── 115-7,8 Print mode: LOGGING（MEM） Print mode: LOGGING（REC） ──────────────────────────────────────────────────── 13.5 Example of Printer Output...

  • Page 327: Printing Procedure

    ──────────────────────────────────────────────────── 13.6 Printing Procedure Internal External Print item See Section printer printer 13.6.1 Manual Print ● ● Auto Print 13.6.2 ● − 13.6.3 Real Time Print ● − Partial Print 13.6.4 ● ● Screen Hard Copy 13.6.5 ● ● List Print 13.6.6 ●...

  • Page 328: Auto Print

    ──────────────────────────────────────────────────── 13.6.2 Auto Print Printout is carried out automatically after a waveform has been captured for the specified recording length. (MEM, FFT) Procedure Screen: STATUS1 (MEM), STATUS2 (FFT) 1. Press the key to display the STATUS STATUS1(STATUS 2 in FFT) screen. 2.

  • Page 329: Real Time Print

    ──────────────────────────────────────────────────── 13.6.3 Real Time Print The input waveform and data are printed out continuously in real time. (in recorder and RMS recorder functions, recorder waveform in REC&MEM) Procedure Screen: STATUS (REC, RMS), STATUS1 (recorder waveform in REC&MEM) 1. Press the key to display the STATUS screen.

  • Page 330: Partial Print

    ──────────────────────────────────────────────────── 13.6.4 Partial Print This function prints the waveform between the A and B cursors (vertical or trace cursors). The function is available also when the A･B cursors are currently outside the range displayed on screen. Printing is possible also when the print format is currently set to "numeric".

  • Page 331: Screen Hard Copy

    ──────────────────────────────────────────────────── 13.6.5 Screen Hard Copy The display contents of the all screens can be printed out as is. Procedure Screen: All 1. Display the desired screen. 2. Press the key. COPY ･ Even if the gauge is set to the List & Gauge function, the gauge is not NOTE printed out in the screen copy mode.

  • Page 332: External Printer (Color Print)

    ──────────────────────────────────────────────────── 13.7 External Printer (color print) Using the 9559 PRINTER CARD, waveform data can be output on A4-size sheets from the external printer in color or monochrome. key: Prints out equivalent to 25 divisions waveform data or numerical PRINT data. key: Prints out the screen hard copy.
  • Page 333 ──────────────────────────────────────────────────── Waveform print s117-1 s117-2 Screen hard copy ──────────────────────────────────────────────────── 13.7 External Printer (color print)
  • Page 334 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 13.7 External Printer (color print)

  • Page 335: Chapter 14 Storing Measurement Data

    ──────────────────────────────────────────────────── Chapter 14 Storing Measurement Data A floppy disk, PC card, MO disk, or connected SCSI devise can be used to store and retrieve measurement and setting data. This chapter explains how to operate these devices, save measured and setup data (SAVE), load data (LOAD), get information on data (INFO), delete data (DELETE), initialize devices (FORMAT), work with directories, create startup files, and remove MO disks.

  • Page 336: Floppy Disk

    ──────────────────────────────────────────────────── 14.1 Floppy Disk ・If a floppy disk is inserted upside down, backwards, or in the wrong CAUTION direction, the floppy disk or the unit may suffer damage. Before shipping the unit, always remove the floppy disk. ・2DD floppy disks formatted in PC9801 640 KB format cannot be used. ・Do not remove the floppy disk while the floppy disk unit is operating (the LED on the floppy disk unit is on).

  • Page 337: 9607 Mo Unit (Option)

    ──────────────────────────────────────────────────── 14.2 9607 MO UNIT (Option) ・If a MO disk is inserted upside down, backwards, or in the wrong CAUTION direction, the MO disk or the unit may suffer damage. Before shipping the unit, always remove the MO disk. ・Do not remove the MO disk while the MO disk unit is operating (the LED on the MO disk unit is on).

  • Page 338: Setting The Internal Mo

    ──────────────────────────────────────────────────── 14.2.1 Setting the Internal MO (When the 9607 is installed) The internal MO drive can be treated as an MO drive in the PC. Procedure Screen: INTERFACE (SYSTEM4) 1. Press the key or function keys to display the SYSTEM INTERFACE screen.

  • Page 339: Pc Card

    ・When formatting a PC card on a PC, use the FAT-16 format. Formatting a card in FAT-32 format may result in incompatibility problems. ・The following five PC card types can be used in the 8841/42: flash ATA card, RS-232C interface card, GP-IB card, printer card, and LAN card.

  • Page 340: Using The Pc Card Slot (Pc Card With A Cable Only)

    Locking spring 3. Insert the PC card in the PC card slot on the 8841/42. Verify that the ▲ mark on the card points in the correct direction, and make sure that the card is properly seated in the slot. The PC card is keyed to prevent wrong insertion, but exerting excessive force may damage the card or the slot.

  • Page 341: Scsi Interface

    1 ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ ･ 25 ･ The SCSI cable is not supplied. NOTE ･ Check the connection types on both the 8841/8842 and the connected device. Use commercially-available SCSI cables. ──────────────────────────────────────────────────── 14.4 SCSI Interface...

  • Page 342: Setting The Mo Disk Drive

    ・Select a SCSI cable with a connector corresponding to that of the disk drive. ・Check that both the 8841/42 and the MO disk drive are powered off. ・Connect firmly the SCSI connector on the right side panel of the 8841/42 and the MO disk drive.

  • Page 343: Setting The Scsi Id

    4. Therefore, if the internal MO drive has been mounted, the ID number 4 cannot be specified. The available value range is 0 to 7. ･ Do not set the SCSI ID of the 8841/42 and target to the same number. NOTE ･...

  • Page 344: Selecting The Media Type

    ──────────────────────────────────────────────────── 14.5 Selecting the Media Type The media type is specified. Procedure Screen: FILE 1. Press the key to display the FILE screen. FILE 2. Move the flashing cursor to the item. MEDIA 3. Use the function keys to make the selection. Function ##F7 g-mo display...

  • Page 345: Initializing (Format)

    (when using the MO) For normal use, use . Use the FORMAT FORMAT(phy) (logical format and physical format) only for disks that cannot be read by the 8841/8842. Function ##g-fm1, fm2 display Meaning : Logical format is used. : Logical format and physical format are used.

  • Page 346: Saving The Data (Save)

    ・It is possible to record the setting state for each of the functions. When a multiblock is used, the setup conditions of the use blocks are stored. ・When a setting state is read into the 8841/42, it is restored in the unit. Size of recording in each function: 512 bytes×41＝20992 bytes (2) Measurement data (MEM, REC, XYC, RMS, FFT, TXT) ・It is possible to save the measurement data of a waveform which has been...
  • Page 347 ──────────────────────────────────────────────────── (6) Hard copy（BMP） The each screen display of the 8841/42 can be stored in the bit map file (BMP) format. Color setting File size Color, Gray 308278 bytes Mono, Mono (rev) 38462 bytes ・The bit map file is one of the standard graphic type of the Windows* therefore by using the graphic software, this file format can be used.

  • Page 348: Setting The Data To Store

    The waveform data or FFT analysis result is TEXT saved in text format. Data stored in the text format is not readable by the 8841/42. The settings are saved. The evaluation area in memory is saved. AREA Function...
  • Page 349 ──────────────────────────────────────────────────── (4) Enter the file name. 1. Move the flashing cursor to the item. file name 2. Use the function keys to select INPUT Function ##F7 display Meaning : Enter a file name. : Clear the file name. : Determines the data to store. : Cancel the command to be saved.
  • Page 350 : Move the cursor down in the selection window. : Determines the data to store. : Cancel the command to be saved. s1271-5 Data stored in the text format is not readable by the 8841/42. NOTE Thinning is not applied with FFT data text format storage. ────────────────────────────────────────────────────...
  • Page 351 ──────────────────────────────────────────────────── (6) Execute saving. 1. Use the function key to select to confirm the enter setting. Function display Meaning : Determines the data to store. : Cancel the command to be saved. 2. Select the function key. (exec) Function display Meaning : Save the file data.
  • Page 352 − − − − ● ● The data is saved to the file. Settings for the 8841/42 are always enabled during reading. − The data is not saved to the file. The data is saved to the index file. ────────────────────────────────────────────────────...
  • Page 353 ──────────────────────────────────────────────────── Text data store example The text data are stored as follows. Depending on the function, the saving method varies.     ：Comment character string "COMMENT","8841 MEM DATA"  "DATE","01‑01‑1999"      ：Date（month−day−year） "TIME","10:10:00"      ：Time     ：Number of signals "NUM̲SIGS", 3 ...
  • Page 354 ──────────────────────────────────────────────────── Example 2 When the data is stored in Recorder function (Recorder function, RMS recorder function, recorder data in Recorder&memory function) "COMMENT","8841 REC DATA" "DATE","01-01-1999" "TIME","10:10:00" "NUM_SIGS",13 "INTERVAL", 1.000E-04 "HORZ_UNITS", "S" "VERT_UNITS", "S", "V", "V", "V", "V", "Bit", "Bit", "Bit", "Bit", "Bit", "Bit", "Bit", "Bit"...

  • Page 355: Loading The Data (Load)

    ──────────────────────────────────────────────────── 14.8 Loading the Data (LOAD) ・The unit settings or the measurement data are transferred from the media to the memory of the unit. ・When loading measurement data, the channel can be specified. Procedure Screen: FILE (1) Select the media to load. 1.
  • Page 356 (R_M) are created. If only measurement data is read, it is read to each function. To read the data recorded by the recorder and memory functions, the index file must be read. ･ Data stored in the text format is not readable by the 8841/42. ──────────────────────────────────────────────────── 14.8 Loading the Data (LOAD)
  • Page 357 Auto Setup Function When the power is switched on with a floppy disk or a PC card inserted, the setting up of the 8841/42 is performed automatically by reading the setting data file called and the evaluation area file called "STARTUP.SET"...
  • Page 358 ──────────────────────────────────────────────────── Note on Overwrite loading To load the measured data file into the 8841/42 when it already contains previously measured data, the previous data takes precedence over the new data (in such an event, "Partly"). Therefore, to reflect all the settings for the waveform data to be loaded, select "REFRESH."...

  • Page 359: File Information (Info)

    COMMAND 5. Use the function keys to select INFO Information about the selected file is displayed. From these files, only information that can be loaded to the 8841/8842 is displayed. Function #g-ld1, 2, 3, 4, 5 display Meaning : Save the data...

  • Page 360: Deleting The Data (Delete)

    ──────────────────────────────────────────────────── 14.10 Deleting the Data (DELETE) Unit settings or measurement data are deleted from the file on selected media. Procedure Screen: FILE 1. Press the key to display the FILE screen. FILE 2. Select MEDIA 3. Move the bar cursor to the file to be deleted. 4.

  • Page 361: Sorting Files (Sort)

    ──────────────────────────────────────────────────── 14.11 Sorting Files (SORT) The file screen is sorted by type. The sort order can be selected from file name, date, file size and type (file extension). Procedure Screen: FILE 1. Press the key to display the FILE screen. FILE 2.

  • Page 362: Operating The Directory

    ──────────────────────────────────────────────────── 14.12 Operating the Directory 14.12.1 Making a Directory (MK DIR) Creates a subdirectory on the selected medium. Procedure Screen: FILE 1. Press the key to display the FILE screen. FILE 2. Select MEDIA 3. Move the flashing cursor to COMMAND 4.

  • Page 363: Changing A Directory (Ch Dir)

    ──────────────────────────────────────────────────── 14.12.2 Changing a Directory (CH DIR) A directory is changed. The 8841/42 provides direct movement only one layer up or down in the directory hierarchy. Procedure 1 Screen: FILE 1. Press the key to display the FILE screen. FILE 2.

  • Page 364: Deleting A Directory (Rm Dir)

    ──────────────────────────────────────────────────── 14.12.3 Deleting a Directory (RM DIR) A directory is deleted. Even if there are files and directories in a directory, the directory can be deleted. Procedure Screen: FILE 1. Press the key to display the FILE screen. FILE 2. Select MEDIA 3.

  • Page 365: Printing The File List

    ──────────────────────────────────────────────────── 14.13 Printing the File List Prints a list of files (including directories) displayed on the file screen. The printing destination is selected by the "PRINT OUTPUT" setting. Procedure 1 Screen: SYSTEM - FILE (1) Set the output destination by PRINT key. 1.
  • Page 366 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 14.13 Printing the File List...

  • Page 367: Chapter 15 Memory Segmentation Function

    ──────────────────────────────────────────────────── Chapter 15 Memory Segmentation Function ･ This function divides the memory into separate blocks, each of which can be used for waveform recording. ･ The memory segmentation function has two modes: sequential save and multi-block. Sequential save function ･ The recording length (DIV) has priority over the number of memory blocks. ･...

  • Page 368: Using The Sequential Save Function

    ──────────────────────────────────────────────────── 15.1 Using the Sequential Save Function Input signal capture is carried out continuously using the trigger, storing waveform data successively in each block. Any block in which an input signal is recorded can be called up on the display. During measurement, displaying, printing, and saving cannot be carried out until the recording data in all block is completed.
  • Page 369 ──────────────────────────────────────────────────── Procedure Screen: STATUS2 (1) Select the Memory Segmentation 1. Press the key to display the STATUS2 STATUS screen. 2. Move the flashing cursor to the position shown in the figure. 3. Select the function key. SEQUEN Function #g-sq1, sq2 display Meaning : Disable memory segmentation...
  • Page 370 ──────────────────────────────────────────────────── (3) Set the follow-up waveform display (MEM only). Waveforms acquired for each block by triggering during the sequential saving process are displayed one by one. As a result, the dead time is increased. 1. Move the flashing cursor to the item, as wave display shown in the figure on the left.
  • Page 371 ──────────────────────────────────────────────────── (6) Setting ref blocks Waveform data recorded in multiple blocks can be displayed in a composite display. 1. Move the flashing cursor to the item. ref block 2. Use the function keys to make the selection. Function ##F3 display Meaning : Disable ref block : Enable ref block...
  • Page 372 (Waveform display, auto printout and auto save are executed.) When the key is pressed twice during measurement, the STOP 8841/42 is forcibly stopped. (Auto printout and auto save are not executed.) (REC&MEM) Measurement is started again. The memory waveform data is cleared.

  • Page 373: Using The Multi-Block Function (Mem)

    ──────────────────────────────────────────────────── 15.2 Using the Multi-Block Function (MEM) ・Memory is divided into blocks which can be freely selected by the user for storing measurement data. ・Data stored in any block can be called up on the display. ・Data from different blocks can be overlaid on screen for easy comparison. (it can be printed out) Overlaid display of data from Store in memory...
  • Page 374 ──────────────────────────────────────────────────── ･ While the multi-block function is being used, the waveform processing NOTE calculation and averaging functions are disabled. ･ If the blocks have different recording lengths, the overlap block display is disabled. ･ The key can be used to change the displayed memory block or to VIEW display information about the usage status of memory blocks.
  • Page 375 ──────────────────────────────────────────────────── Maximum number of divisions The maximum number of divisions and the maximum recording length are automatically determined according to the set memory capacity and number of available channels, as shown in the tables below. 8 M words 32 M words Number of channels Number of channels Number of...
  • Page 376 ──────────────────────────────────────────────────── (5) Set the ref block. Select a memory block whose waveform data are to be overlaid on screen with the memory block selected for display. The recording start time and time axis range are displayed on the window. 1. Move the flashing cursor to the item.

  • Page 377: Chapter 16 Waveform Operation Function

    ──────────────────────────────────────────────────── Chapter 16 Waveform Operation Function 16.1 Waveform Parameter Calculation (MEM) ・Available for memory recorder function and REC&MEM function. The Memory waveform for the Record & Memory function is performed with the Memory recorder function. ・Parameters that were used for captured waveform data and for data after waveform processing can be determined.
  • Page 378 ──────────────────────────────────────────────────── Waveform parameter calculation Operating Sequence Setting the waveform Disable parameter calculation. parameter calculation Enable parameter calculation. Setting for parameter calculation result Disable printout printout Enable printout Setting for parameter calculation result Storing is disabled. saving Stored on floppy disk Stored on PC card SCSI Stored on connected SCSI device...

  • Page 379: Making Settings For Waveform Parameter Calculation

    ──────────────────────────────────────────────────── 16.1.1 Making Settings for Waveform Parameter Calculation Waveform parameter calculations results can be printed on the internal printer. Waveform parameter calculations results can be saved in text format to the current directory selected in the FILE screen. For the file name to be saved, see Section 14.7, "Saving the Data." Procedure Screen: STATUS3 (1) Set the waveform parameter calculation.
  • Page 380 ──────────────────────────────────────────────────── (3) Select parameter calculation 1. Move the flashing cursor to the position shown in the figure on the left. 2. Use the function keys to make the selection. Up to four parameter calculations (No. 1 - 4) can be set simultaneously. Flashing cursor : Disable calculation : Period...

  • Page 381: Making Settings For Waveform Parameter Evaluation

    ──────────────────────────────────────────────────── 16.1.2 Making Settings for Waveform Parameter Evaluation ・Depending on the results of the waveform parameter calculation, a GO (pass) or NG (fail) result is returned. ・Evaluation criteria can be set independently for each of the calculation sets No. 1 - No. 4. Procedure Screen: STATUS3 1.

  • Page 382: Setting The Waveform Parameter Go/Ng Stop Mode

    ──────────────────────────────────────────────────── 16.1.3 Setting the Waveform Parameter GO/NG Stop Mode Specify which evaluation option, GO or NG, should be used to stop the recording. Procedure Screen: STATUS3 1. Move the flashing cursor to the position "stop mode". 2. Make the setting with the function keys. Function #g-wv4, 5, 6 display...

  • Page 383: Executing Waveform Parameter Calculation

    ･ Displays "Storing". Waveform displays after data corresponding to Storing measurement recording length have been stored in memory. data ･ When the key is pressed twice during measurement, the 8841 STOP is forcibly stopped. (Parameter calculation are not executed.) Parameter calculation Displays "Calculating".
  • Page 384 ──────────────────────────────────────────────────── Calculation of data stored in memory Selecting the calculation Press the key to display the FILE screen. FILE Loading from the media Read the measurement data. See Section 14.8 The measurement data stored in memory of the unit is Internal memory data calculated.

  • Page 385: Calculating Waveform Data

    ──────────────────────────────────────────────────── 16.2 Calculating Waveform Data ・Waveform processing is possible only for the memory recorder function and REC&MEM function. The Memory waveform for the Record & Memory function is performed with the Memory Recorder function. ・Processing result are displayed as a waveform. ・The maximum recording length allowing waveform processing calculation is 1000 divisions (5000 divisions for 32 M words).

  • Page 386: Preparing For Waveform Processing

    ──────────────────────────────────────────────────── 16.2.1 Preparing for Waveform Processing Procedure Screen: STATUS4 1. Press the key to display the STATUS4 STATUS screen. 2. Move the flashing cursor to wave calculation 3. Make the setting with the function keys. Function display Meaning : Disable waveform processing. : Enable waveform processing.

  • Page 387: Defining The Processing Equation

    ──────────────────────────────────────────────────── 16.2.2 Defining the Processing Equation Sixteen processing equations (Z1 - Z16) can be defined. Procedure Screen: STATUS4 Making the processing equation 1. Press the key to display the STATUS4 STATUS screen. 2. Move the flashing cursor to 3. Use the function keys to select the enter eqn Function #g-eq1, 2, 3...
  • Page 388 ──────────────────────────────────────────────────── Operators (For details, see Section Appendix.3.9.) DIF2 Absolute value 2nd differential Exponential INT2 2nd integral Logarithm Sine Square root Cosine Displacement average Tangent Parallel displacement on time axis ASIN Arc-sine 1st differential Arc-cosine 1st integral Arc-tangent ･ If the calculable maximum recording length is set, calculation formulas Z1 to NOTE Z8 are enabled.
  • Page 389 ──────────────────────────────────────────────────── Entering the constant values 1. Move the flashing cursor to CONST 2. Use the function keys to select enter The setting range is -9.9999E+29 to +9.9999E+29 (exponent: -29 to +29). Function #g-eq6 display Meaning : Enter the constant values. 3.

  • Page 390: Copying An Equation

    ──────────────────────────────────────────────────── 16.2.3 Copying an Equation An equation to which an equation number has been assigned (copy source) can be copied to another equation number (copy target). Procedure Screen: STATUS4 1. Move the flashing cursor to one of the Z1 - Z16 items.

  • Page 391: Setting The Channel For Recording Processing Results

    ──────────────────────────────────────────────────── 16.2.4 Setting the Channel for Recording Processing Results ・The calculation result of equations Z1 - Z16 can be recorded and displayed in a specified channel. ・Processing results can be recorded also in channels where no input unit is installed (but the range of the "number of channels in use" setting cannot be exceeded).

  • Page 392: Setting The Display Scale And Number Of Moved Points

    ──────────────────────────────────────────────────── 16.2.5 Setting the Display Scale and Number of Moved Points ・Display scale can be set automatically or manually. ・The channel selected for recording is automatically set to variable display. (See Section 9.7) ・If MOV or SLI was used, the number of moved points must be specified. Procedure Screen: STATUS4 1.
  • Page 393 ──────────────────────────────────────────────────── Setting the number of moved point 1. Move the cursor to the position of the number of moved point setting (MOV or SLI). 2. Move the cursor to each digits and make the setting with the function keys or the Jog/Shuttle control. To move the digit, use the cursor keys ( For MOV (moving average): 1 to 4000 For SLI (parallel displacement): -4000 to +4000...

  • Page 394: Perform Waveform Processing

    Waveform displays after data corresponding to recording length data have been stored in memory. When the key is pressed twice during measurement, the STOP 8841/42 is forcibly stopped. (Waveform calculation are not executed.) Displays Waveform calculating Waveform calculation When the waveform processing calculation is forcibly terminated, a forced termination displays the results being calculated.
  • Page 395 ──────────────────────────────────────────────────── Waveform processing of data in internal memory or media Select the calculating data Press the key to display the FILE screen. FILE Loading from media For details on LOAD, refer to Section 14.8. Internal memory data Waveform calculation execute the stored measurement data. This setting calculates the measurement data between A and B Setting the calculating cursors.

  • Page 396: Waveform Go/Ng Evaluation (Mem, Fft)

    ──────────────────────────────────────────────────── 16.3 Waveform GO/NG Evaluation (MEM, FFT) ・The waveform evaluation function can be used from the Memory recorder (single screen, X-Y single screen), FFT (single screen, Nyquist screen). ・GO (pass) or NG (fail) evaluation of the input signal waveform can be performed using an evaluation area specified by the user.
  • Page 397 ──────────────────────────────────────────────────── ･ If a high setting is chosen for recording length or if compression is used, the NOTE evaluation cycle becomes slower. ･ On the waveform evaluation screen, A･B cursors can be used, but a partial printout cannot be made. ･...

  • Page 398: Setting The Waveform Area

    ──────────────────────────────────────────────────── 16.3.1 Setting the Waveform Area To evaluate the waveforms, a evaluation area is required. Two methods are available: one is to load the already created evaluation area and settings, and the other is to create a new evaluation area. (1) Loading the already created evaluation area Screen: FILE 1.

  • Page 399: Setting The Waveform Evaluation Mode

    ──────────────────────────────────────────────────── 16.3.2 Setting the Waveform Evaluation Mode Procedure Screen: STATUS1 (MEM), STATUS2 (FFT) 1. Move the flashing cursor to comparison 2. Make the setting with the function keys. Function #g-wv1, 2, 3 display Meaning : Disable waveform evaluation. : Return NG if any part of the waveform leaves the evaluation area.

  • Page 400: Creating The Evaluation Area

    ──────────────────────────────────────────────────── 16.3.4 Creating the Evaluation Area Procedure Screen: STATUS1 (MEM), STATUS2 (FFT) 1. Move the flashing cursor to the item. comparison Select the function key. Edit 2. Use these commands to create the evaluation area. 3. When the area has been stored in memory, it can be used for waveform evaluation.
  • Page 401 ──────────────────────────────────────────────────── g-ed3 undo Function key display: 1/3 Serves to undo the immediately preceding command. Undo is applicable to all commands except save and end. Press this key and clears the editor screen g-ed4 Function key display: 1/3 Terminates the editor. Press this key and select storing evaluation area in memory and quit editor or quitting editor without storing evaluation area in memory.
  • Page 402 ──────────────────────────────────────────────────── g-ed7 all clr Function key display: 2/3 Clears the entire editor screen. Press this key. g-ed8 reverse Function key display: 2/3 Reverses the colors of a filled-in area and the surrounding area. Press this key. Displays filled in area in reverse. g-ed9 erase Function key display: 3/3...

  • Page 403: External Input/Output Terminals

    17.1.1 Connecting the Terminals Maximum input voltage ratings for the input/output terminals of the WARNING 8841/42 are shown below. To avoid the risk of electric shock and damage to the unit, take care not to exceed these ratings. Maximum rated voltage...

  • Page 404: External Trigger Input Terminal [Ext Trig]

    17.1.2 External Trigger Input Terminal [EXT TRIG] ・An external signal can be used as trigger source. ・Several 8841/42 units can be synchronized for parallel operation. Signal input method ・Short the terminal to ground, or input a pulse signal (High level: 2.5 to 5.0 V, Low level: 0 to 1.0 V) or a square wave signal.

  • Page 405: External Sampling Terminal [Ext Smpl]

    ──────────────────────────────────────────────────── 17.1.4 External Sampling Terminal [EXT SMPL] An external signal can be used to set the sampling rate. Signal input method ・Input a pulse signal (High level: 2.5 to 5.0 V, Low level: 0 to 1.0 V) or a square wave signal to the terminal to ground. ・Triggering is activated at the falling edge of the input waveform.

  • Page 406: Go/Ng Evaluation Output Terminal

    ──────────────────────────────────────────────────── 17.1.6 GO/NG Evaluation Output Terminal When waveform evaluation or waveform parameter evaluation is used, a signal is output from these connectors when the result is GO (pass) or NG (fail). Output signal Signal type Open-collector signal, active Low High level: 4.0 to 5.0 V, Low level: 0 to 0.5 V Output voltage range Maximum input voltage -20 to +30 V, max.

  • Page 407: Using The Key Lock Function

    ──────────────────────────────────────────────────── 17.2 Using the Key Lock Function ･ This function disables all front-panel controls of the 8841/42. ･ The function serves to prevent unintended changes to settings during a measurement. (1) Press both cursor keys ( ) simultaneously for 3 seconds to open a window in which you can check key lock on/off status.
  • Page 408 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 17.2 Using the Key Lock Function...

  • Page 409: Chapter 18 Specifications

    Real time recording & High-speed data saving Frequency analysis Number of channels (maximum) 16 analog channels + 16 logic channels (The logic channels are standard equipment for the 8841/42, common ground with main unit) Memory capacity Standard: 8 M words...
  • Page 410 Rated power frequency 50/60 Hz Maximum rated power 8841: 300 VA max （when printer off and 8936 installed: 85 VA） （when printer off and 8946 installed: 95 VA） 8842: 300 VA max （when printer off and 8936 installed: 105 VA）...

  • Page 411: External Data Storage And Interface

    ──────────────────────────────────────────────────── 18.2 External Data Storage and Interface Floppy Disk Device 3.5-inch floppy disk drive Capacity 1.44 MB (2HD) (IBM PC/AT compatible or NEC PC-9801 series with 3-mode drive) 1.2 MB (2HD) (NEC PC-9801 series) 720 KB (2DD) (IBM PC/AT compatible) Data format MS-DOS format (MS-DOS is the registered trademark of Microsoft Corporation.)
  • Page 412 ──────────────────────────────────────────────────── Interface GP-IB Complies with IEEE 488.2-1987 ･ Remote control including input unit is possible. ･ The optional 9558 GP-IB CARD is used. RS-232C Complies with EIA RS-232C ･ Remote control including input unit is possible. ･ The optional 9557 RS-232C CARD is used. Printer Complies with PC-AT centronics ･...

  • Page 413: Trigger Unit

    ──────────────────────────────────────────────────── 18.3 Trigger Unit Trigger Method Digital comparison Trigger modes Memory recorder, FFT Single, repeat, auto Recorder, RMS recorder Single, repeat Recorder&Memory Single, repeat, timer Trigger source CH1 to CH16, logic CHA to CHD ･ External trigger (With an external trigger, the triggering occurs on a falling edge of 2.5 V, or when the terminals are shorted together.) ･...

  • Page 414: Memory Recorder Function

    ──────────────────────────────────────────────────── 18.4 Memory Recorder Function Time axis 100, 200, 500μs/DIV 1, 2, 5, 10, 20, 50, 100, 200, 500 ms/DIV 1, 2, 5, 10, 30 s/DIV 1, 2, 5 min/DIV EXT. Time axis resolution 100 points/DIV Sampling period 1/100 of the time axis Recording length Standard (8 M words) 25,50,100,200,500,1000,2000,5000,10000...

  • Page 415: Recorder Function

    ──────────────────────────────────────────────────── 18.5 Recorder Function Time axis , 50 , 100 , 200 , 500 ms/DIV 1, 2, 5, 10, 30 s/DIV 1, 2, 5, 10, 30 min/DIV 1 h/DIV Time axis resolution 100 points/DIV (with the printer) Sampling period 1, 10, 100μs, 1, 10, 100 ms (Can be selected, from 1/100 of the time axis setting) Recording length Standard (8 M): 25,50,100,200,500,1000,2000 DIV,CONT...

  • Page 416: Rms Recorder Function

    ──────────────────────────────────────────────────── 18.6 RMS Recorder Function Time axis 5, 10, 30 s/DIV, 1, 2, 5, 10, 30 min/DIV, 1 h/DIV Time axis resolution 100 points/DIV (with the printer) Number of channel Analog 16 ch + logic 16 ch Sampling period 20 rms data/s (200 μs fixed) RMS accuracy ±3% f.s.

  • Page 417: Recorder & Memory Function

    ──────────────────────────────────────────────────── 18.7 Recorder & Memory Function Time axis Recorder 20, 50, 100, 200 ms/DIV (display only) 500 ms/DIV 1, 2, 5, 10, 30 s/DIV 1, 2, 5, 10, 30 min/DIV 1 h/DIV Memory Recorder 100, 200, 500 μs/DIV 1, 2, 5, 10, 20, 50, 100, 200, 500 ms/DIV 1, 2, 5, 10, 30 s/DIV 1, 2, 5 min/DIV Time axis resolution...

  • Page 418: Fft Function

    ──────────────────────────────────────────────────── 18.8 FFT Function FFT channel mode 1 ch FFT 2 ch FFT FFT range setting 133 mHz to 400 kHz, EXT. Dynamic range 72 dB (logical value) Number of sampling 1000, 2000, 5000, 10000 points points Frequency resolution 1/400, 1/800, 1/2000, 1/4000 Antialiasing filter Automatic cutoff frequency selection linked to frequency range Analysis channel setting...

  • Page 419: Auxiliary Functions

    ──────────────────────────────────────────────────── 18.9 Auxiliary Functions Computation functions 1. Waveform processing calculations (MEM) (MEM) Arithmetic operations, absolute value, exponents, common logarithms, square roots, moving average, 1st and 2nd derivatives, 1st and 2nd integrals, parallel displacement on time axis, trigonometric functions, reverse trigonometric functions 16 arbitrary operational equations: Calculations are possible up to a recording length that corresponds to one fourth of the memory capacity.

  • Page 420: Others

    ──────────────────────────────────────────────────── 18.10 Others Comment printing Function, channel, Input range, Zero position, Trigger time, DIV and other information can be printed. Comment input function Provided Cursor measurement function Time difference, voltage difference or number of cycles between cursors A and B, voltage at each cursor, time from trigger Scaling function Specifiable for each channel Display copy function...

  • Page 421: System Operation

    ──────────────────────────────────────────────────── 18.11 System Operation System operation is explained according to the block diagram. ・All system operations are controlled by a 32-bit RISC CPU. ・The input unit incorporates high-speed 12-bit A/D converters which are connected to the main unit via a photocoupler integrated in each input unit. Each channel has its own power supply, to assure electrical isolation from the main unit.

  • Page 422: Maximum Recording Length For Time Axis Settings

    ──────────────────────────────────────────────────── 18.12 Maximum Recording Length for Time Axis Settings Memory Recorder Function: Standard (8 M) Max. recording length Time axis Sampling 16 channels 8 channels 4 channels 2 channels range /DIV period 5000 DIV 10000 DIV 20000 DIV 40000 DIV 100 μs 1.00 μs 500ms...
  • Page 423 ──────────────────────────────────────────────────── Recorder Function Approximate recording time on one roll (30 m) of recording paper (Time axis resolution: 100 points /DIV) Recording paper Time axis range Recording time transport speed 20ms/DIV 20mm/s 1 min 25 min 5 min 10 min 25 min 1s/DIV 50 min 1 h 40 min...

  • Page 424: Memory Capacity And Recording Length

    ──────────────────────────────────────────────────── 18.13 Memory Capacity and Recording Length Memory Recorder Function Number of divisions per channel (channel) Card capacity 8 M words 40000 20000 10000 5000 32 M words 160000 80000 40000 20000 Recorder and RMS Recorder Function Card capacity Number of divisions 8 M words 2000 32 M words...

  • Page 425: Chapter 19 Logic And Analog Inputs

    (common ground). If voltage having a different ground level is input, a short circuit will occur, depending on the probe type. Do not connect logic probes other than supplied by HIOKI to the logic inputs. Logic Probe Connection ・The logic input is located on the right side of the unit.
  • Page 426 ──────────────────────────────────────────────────── 9320 LOGIC PROBE ・When measuring digital signals Set the input selector to DIGITAL when measuring digital signals. In this case, use IC clip lead. Connect the alligator clip to the circuit ground. Use the threshold value selector to select the threshold value. ・When measuring contact signals Set the input selector to CONTACT when measuring contact signals.

  • Page 427: Analog Inputs

    ──────────────────────────────────────────────────── 19.2 Analog Inputs Measurement Errors Caused by Signal Source Internal Resistance ･ If the signal source impedance is higher than the input impedance of the unit, a measurement error will occur. ･ The input impedance of the 8936 ANALOG UNIT is 1 MΩ. If the signal source impedance is 1 kΩ, an error of about 0.1% will occur.

  • Page 428: 8937 Voltage / Temp Unit

    ──────────────────────────────────────────────────── Effect of radiated radio- ±2%f.s. at 3V/m frequency electromagnetic field ±28%f.s. at 3V Effect of conducted radio- frequency electromagnetic field Dielectric strength Between 8936 and main unit, between 8936 and input unit: 3.7 kVAC for a minute Approx. 170W×20H×148.5D mm (6.69"W×0.79"H×5.832"D), Dimensions / Mass Approx.
  • Page 429 ──────────────────────────────────────────────────── Temperature measurement K, E, J, T, N ±0.1% f.s.±1.0 ±0.1% f.s.±2.0 C (-200℃ to 0 accuracy R, S ±0.1% f.s.±3 B (effective measurement range: 400 C to 1800 ±0.1%f.s.±4 Selectable internal or external Reference junction compensation Reference junction C (with internal reference contact compensation and input ±0.1%f.s.±1.5 terminal in state of temperature equilibrium) compensation accuracy...

  • Page 430: 8938 Fft Analog Unit

    ──────────────────────────────────────────────────── 19.2.3 8938 FFT ANALOG UNIT Accuracy at 23 C±5 C, 35% to 80%RH zero adjustment, after 30-minutes warming-up time. Accuracy guaranteed for 1 year 2 channels Number of channels 5, 10, 20, 50, 100, 200, 500 mV/DIV, 1, 2, 5, 10, 20 V/DIV Measurement range DC amplitude accuracy ±0.4%f.s.

  • Page 431: 8939 Strain Unit

    ──────────────────────────────────────────────────── 19.2.4 8939 STRAIN UNIT Accuracy at 23 C±5 C, 35% to 80%RH after auto-balancing, after 60-minutes warming-up time. Accuracy guaranteed for 1 year Number of input channels 2 channels Strain gauge adapter, Bridge resistance: 120 Ω to 1 kΩ Appropriate adapter 2±0.05 Ｖ...

  • Page 432: 8946 4Ch Analog Unit

    ──────────────────────────────────────────────────── 19.2.5 8946 4ch ANALOG UNIT Accuracy at 23 C±5 C, 35% to 80%RH after auto-balancing, after 60-minutes warming-up time. Accuracy guaranteed for 1 year 4 channels Number of channels 10, 20, 50, 100, 200, 500 mV/DIV, 1, 2 V/DIV Measurement range DC amplitude accuracy ±0.5%f.s.

  • Page 433: 8940 F/V Unit

    ──────────────────────────────────────────────────── 19.2.6 8940 F/V UNIT Accuracy at 23 C±5 C, 35% to 80%RH after auto-balancing, after 30-minutes warming-up time. Accuracy guaranteed for 1 year ■ General specifications 12 bit A/D resolution 80 LSB/DIV Vertical axis resolution Frequency measurement, Count, Duty, Voltage measurement, Measurement function Current measurement 1μs...
  • Page 434 ──────────────────────────────────────────────────── ■ Frequency, Count and Duty Measurement Frequency 0.05, 0.1, 0.5, 1,5, 10, 50, 100, 500 Hz/DIV 1, 5 kHz/DIV 5, 10, 50, 100, 500 r/min/DIV ranges Power source frequency ranges: P50 Hz（40 to 60 Hz） , P60 Hz（50 to 70 Hz） Frequency ±0.2%f.s.（except 100 kHzf.s.

  • Page 435: 8947 Charge Unit

    ──────────────────────────────────────────────────── 19.2.7 8947 CHARGE UNIT Accuracy at 23 C±5 C, 35% to 80%RH after auto-balancing, after 60-minutes warming-up time. Accuracy guaranteed for 1 year ■ General specification Number of input channels 2 channels (switching) Any of the following can be selected: Charge input, input from preamp, voltage input or individual channels Unbalanced input (floating between inputs, floating between input and unit Input type...
  • Page 436 ──────────────────────────────────────────────────── ■ Charge Input Compatible converter: Charge-output type piezoelectric accelerator pickup sensor Measurement sensitivity 0.1 to 10 pC/(m/s Measurement range 2,5,10,20,50,100,200,500,1k,2k,5k,10 km/s /DIV （Measurement sensitivity: 0.1 to 0.25 pC/(m/s )） 1,2,5,10,20,50,100,200,500,1k,2k,5 km/s /DIV )） （Measurement sensitivity: 0.251 to 0.5 pC/(m/s 500m,1,2,5,10,20,50,100,200,500,1k,2 km/s /DIV （Measurement sensitivity: 0.501 to 1.0 pC/(m/s...
  • Page 437 ──────────────────────────────────────────────────── ■ Voltage input 500μ, 1m, 2m, 5m, 10m, 20m, 50m, 100m, 200m, 500m, 1, 2 V/DIV Measurement range DC amplitude accuracy ±0.4%f.s. Zero position setting range ±0.15%f.s. Temperature characteristic Gain: ±0.02%f.s./ C, zero position: ±0.03%f.s./ DC to 400 kHz +1/-3 dB（DC coupling） Frequency characteristic 1 to 400 kHz +1/-3 dB（AC coupling, low-end cutoff frequency 1Hz±...
  • Page 438 ──────────────────────────────────────────────────── ──────────────────────────────────────────────────── 19.2 Analog Inputs...
  • Page 439 ──────────────────────────────────────────────────── Chapter 20 Maintenance and Service 20.1 Maintenance and Inspection To ensure the safe operation of this unit, perform maintenance regularly. ･ If the unit has been subject to moisture, or if oil and dust have accumulated in the unit interior, the danger of electrical shock or fires resulting from the deterioration of insulation increases greatly.
  • Page 440 ──────────────────────────────────────────────────── ■ Printer Head Cleaning In normal use, the printer does not require periodic maintenance. However, depending on usage conditions, the thermal head may become contaminated by dust or paper scraps. If the print seems light or if there are dropped sections, clean the head as described below.
  • Page 441 ･ Install the units by reversing the procedure for removal. 1. Remove the connector cables from all input units. 2. Power off the 8841/42 main unit, and disconnect the power cord. 3. Remove the two fixing screws with a Phillips screwdriver, as shown in the figure below.
  • Page 442 ──────────────────────────────────────────────────── 20.3 Replacing the Fuse of the 9433 WARNING If the fuse has blown, an internal defect in the power supply section of the 9433 may be caused. Check for defects before replacing the fuse. To avoid electric shock, turn off the power switch and disconnect the input cables before replacing the fuse.
  • Page 443 When disposing of this product, remove the lithium battery and dispose of battery and product in accordance with local regulations. Before final disposal of the 8841/42, remove the battery as described below. 1. Verify that the power is switched OFF.
  • Page 444 ──────────────────────────────────────────────────── 20.5 Troubleshooting If the unit does not seem to operate normally, check the following points before requesting service. Problem Check Is power cord connected properly? LED does not light when the unit is turned on. There is absolutely no Is the "Pretrigger standby"...
  • Page 445 APPENDIX 1 ──────────────────────────────────────────────────── Appendix Appendix 1 Error Messages The unit produces two levels of message to indicate problems. These are distinguished as follows. Error messages ・The "ERROR" indication appears at the bottom of the screen, followed by the message. This remains until the cause of the error is removed, or the STOP key is pressed.
  • Page 446 No disk is present in the floppy disk drive. Insert one. WARNING 71: Cannot load Data cannot be loaded, because it is not a set of data created by the 8841/42. (not 8841,42 data) The media is not a correctly formatted MS-DOS, or the WARNING 72: Illegal format.
  • Page 447 APPENDIX 3 ──────────────────────────────────────────────────── The pre-trigger cannot be set "-95%" at a recording length of WARNING 215: Cannot set -95%. 160000 DIV. MO drive selected in auto-save, therefore SCSI cannot be WARNING 216: MO drive selected in auto-save. selected. Connected SCSI devise selected in auto-save, therefore MO WARNING 217: SCSI selected in auto- save.
  • Page 448 APPENDIX 4 ──────────────────────────────────────────────────── WARNING 356: Change time axis. If the speed of the recorder time axis range is increased beyond two steps below the memory time axis range, the (MEMORY) memory time axis range speed is incremented. The anti-aliasing filter setting is invalid for the time axis WARNING 357: AAF is invalid.
  • Page 449 The 8841/42 cannot connect to the PC that runs the 9333. Check the connection environment. server. WARNING 625: LAN: Can not connect to The 8841/42 cannot connect to the 9333. Check on the PC to see whether the 9333 is in standby status. 9333. WARNING 626: LAN: Connection time Check the connection environment.
  • Page 450 Formatting that writes basic file structure information to the Logical formatting physically-formatted disks, making them compatible for use with the 8841/8842 system. Filter that passes through only signals below a certain frequency Low-pass filter A device for storing digital data...
  • Page 451 APPENDIX 7 ──────────────────────────────────────────────────── AC component of noise Ripple component Sampling Measuring an analog waveform at regular intervals Sampling rate Rate at which sampling carried out; sampling frequency Scaling Conversion of voltage value into a specified unit Storage Storing measurement data in the internal memory Print head of thermal printer Thermal head Threshold value...
  • Page 452 ──────────────────────────────────────────────────── Appendix 3 Reference Appendix 3.1 Sampling ・The 8841/42 converts the input signal to a digital value, then carries out all internal processing digitally. This process of converting an analog signal to digital values is termed sampling. ・Sampling measures the magnitude of the signal at fixed time intervals (sampling periods).
  • Page 453 APPENDIX 9 ──────────────────────────────────────────────────── Appendix 3.3 Measurement Limit Frequency ・As a general rule, to ensure that sampling catches the peaks of a typical sine wave input on the display, more than 25 samples are required for each input cycle. ・The measurement limit frequency changes depending on the time axis range. ・...
  • Page 454 APPENDIX 10 ──────────────────────────────────────────────────── Appendix 3.4 Recorder Function ・One division is equal to 100 samples. ・One piece of sample data collected using the recorder function contains the maximum and minimum voltage obtained in the set sampling period. Therefore, this data is of a certain width. 1 2 3 4･･･････...
  • Page 455 APPENDIX 11 ──────────────────────────────────────────────────── Appendix 3.5 RMS Recorder Function ・For the RMS recorder function, the sampling period is fixed to 20 RMS value data items per second. ・One division is equal to 100 samples. Calculate one RMS value 141 V Sample the 50 Hz or 60 Hz waveforms a 200μs and calculate one RMS value ite using two-period data.
  • Page 456 APPENDIX 12 ──────────────────────────────────────────────────── Appendix 3.6 Averaging Equations For time axis averaging in memory recorder and FFT functions, summing averaging is synchronized by the trigger. If trigger synchronization is not performed, the results will be meaningless. In FFT function, unlike time axis averaging, results are valid also if no trigger synchronization is used.
  • Page 457 APPENDIX 13 ──────────────────────────────────────────────────── Appendix 3.8 Waveform Parameter Calculation Details (1) Average value Calculates the average value (V) of the waveform data. Σ di/n i = 1 average value number of data samples i-th data of the source channel (2) RMS value Calculates the RMS (effective) value (V) of the waveform data.
  • Page 458 APPENDIX 14 ──────────────────────────────────────────────────── (10) Rise time (11) Fall time ・From the captured waveform data, the 0% and 100% level is determined, and the rise time (s) is taken as the time required to go from 10% to 90% (fall time: from 90% to 10%). ・In the captured waveform data, the first rising slope (or falling slope) is used to make the calculation.
  • Page 459 APPENDIX 15 ──────────────────────────────────────────────────── (14) X-Y area value ・Calculates the area (V ) after X-Y plotting. ・The waveform is plotted on the X-Y screen, and the area enclosed by the plot lines is calculated. ・In single, dual, or quad screen, the A･B cursors (vertical, trace) can be used to specify the range (see Section 11.2.) for X-Y plotting and area calculation.
  • Page 460 APPENDIX 16 ──────────────────────────────────────────────────── Appendix 3.9 Details on Operators This section describes the operators used in waveform operation. The parameter "bi" shows the operational result, and "di" shows the source channel, respectively, in which "i" indicates the serial number of data. (1) The four arithmetical operations (＋, −, ＊, ／) According to the operators set, the four arithmetical operations are performed.
  • Page 461 APPENDIX 17 ──────────────────────────────────────────────────── (8) Differentiation once (DIF) (9) Differentiation twice (DIF2) ・1st and 2nd differential are calculated using the 5th-order Lagrange interpolation equation, whereby data from a range of five surrounding points are used to determine the value of the current point. ・Data corresponding to sample time t are taken as d and used for...
  • Page 462 APPENDIX 18 ──────────────────────────────────────────────────── 2st integral Point t Point t = (I )h/2 Point t = (I )h/2 + (I )h/2 ＝ II + (I )h/2 Point t = II + (I )h/2 to II processing result data (12) Sine (SIN) = sin(d ) (i = 1, 2, ..
  • Page 463 APPENDIX 19 ──────────────────────────────────────────────────── Appendix 3.10 FFT Function FFT stands for Fast Fourier Transformation, which is a calculation method used to decompose a time-domain waveform into frequency components. By performing FFT calculation, various calculations can be performed. Concept of time domain and frequency domain The signals measured by this memory recorder have values which correspond to time, that is the signals are functions of time.
  • Page 464 APPENDIX 20 ──────────────────────────────────────────────────── Application of Fourier transform (transfer function, unit-impulse response) As an application of Fourier transform, this section describes a steady-state response in a static linear system. fin(t) h(t) fout(t) Input Output H( ω ) Fin( ω ) Fout( ω ) fin(t): time function of input (source signal) fout(t): time function of output (response function) h(t): unit impulse response of linear system...
  • Page 465 1/2 of the sampling frequency. Such a low-pass filter is called an anti-aliasing filter. ・The input unit incorporates an anti- aliasing filter and therefore allows the 8841/42 to perform FFT analysis without being subject to aliasing. ──────────────────────────────────────────────────── Appendix 3 Reference...
  • Page 466 APPENDIX 22 ──────────────────────────────────────────────────── When an anti-aliasing filter is not used. This is a spectral artifact that occurs as a result of aliasing of the high frequency component of a signal with the A/D converter sampling rate. Although visible during measurement, it does not exist in reality. Because no anti-aliasing filter is present, fine square waves are monitored through the high-frequency amplifier, so the corners of square waves include high-frequency components.
  • Page 467 APPENDIX 23 ──────────────────────────────────────────────────── Window processing Fourier transform is defined as the integration from negative infinity to positive infinity, but in actual measurement this calculation is not possible. Therefore only a limited segment of the continuous signal is taken for processing. This is called window processing. The FFT algorithm assumes that the data of that limited segment are repeated and defines the input signal using a periodic function for determining the frequency spectrum.
  • Page 468 ・To minimize the leakage error, a suitable window should be chosen which matches the type of input signal. ・Possible window types include rectangular, Hanning, exponential, flat-top, minimum, force, etc. In the 8841/42, three window functions (rectangular, Hanning, exponential) are available. ・Generally, the rectangular window function is most useful for single waveforms, the Hanning window function for continuous waveforms, and the exponential window function for attenuated waveforms.
  • Page 469 APPENDIX 25 ──────────────────────────────────────────────────── Hanning window Input waveform Waveform assumed by FFT processing Hanning window Waveform after window processing Exponential window Input waveform Waveform assumed by FFT processing Exponential window Waveform after window processing ──────────────────────────────────────────────────── Appendix 3 Reference...
  • Page 470 APPENDIX 26 ──────────────────────────────────────────────────── Appendix 4 Size of a Waveform File (Binary data) In the memory recorder function (Binary data) Size of a file = header + data Size of a header = 512×{3 + number of analog channels to be saved + 3×(number of analog channels +7)/ 8+number of logic channels to be saved} Size of a data = (2×number of analog channels to be saved + (number of logic channels to be saved +1)/2)×...
  • Page 471 APPENDIX 27 ──────────────────────────────────────────────────── In the recorder and RMS recorder functions (Binary data) Size of a file = header + data Size of a header = 512×{3 + number of analog channels to be saved + 3×(number of analog channels +7)/ 8+number of logic channels to be saved} Size of a data = (4×number of analog channels to be saved + number of logic channels to be saved)×...
  • Page 472 APPENDIX 28 ──────────────────────────────────────────────────── Appendix 5 Size of a Waveform File (Reference value of text data) In the memory recorder function (text data) (Reference value) Size of a file = header + data Size of a header = 170+27× number of analog channels+64×number of logic probes Size of a data = (14+13×number of analog channels+9×number of logic probes)×(recording length[DIV]×...
  • Page 473 APPENDIX 29 ──────────────────────────────────────────────────── In the Recorder and RMS recorder functions (text data) (bytes) Size of a file = header + data Size of a header = 170 + 64×number of analog channels + 165×number of logic probes Size of a data = (14+26×number of analog channels+18×number of logic probes)×(recording length[DIV]× 100+1) (Truncates the decimal portion of the quotient of division.
  • Page 474 APPENDIX 30 ──────────────────────────────────────────────────── Appendix 6 FFT File Size ■ Binary Data Size Unit: Byte Average：OFF Average：ON Number of points 1 ch FFT 2 ch FFT* 1 ch FFT 2 ch FFT* 1000 15,632 26,144 17,636 40,156 2000 25,632 46,144 29,636 74,156 5000 55,632...
  • Page 475 APPENDIX 31 ──────────────────────────────────────────────────── Appendix 7 Real-Time Save Files Size (Memory data) Size of a file = header + data Size of a header = 512×(9 + number of analog channels + number of logic probes) Size of a data= 2×number of analog channels×(recording length (DIV)×100 + 1) Saved channel number: When saving channels, each analog channel (up to 8) has a corresponding logic channel, and such pairs are regarded as single...
  • Page 476 APPENDIX 32 ──────────────────────────────────────────────────── Appendix 8 Waveform Viewer (Wv) The waveform viewer provides a simplified view of data transferred to a PC by remote control or data acquisition. The viewer has a CSV conversion function. Converted files may be read by a spreadsheet program. System requirements For a PC running Windows 95, 98, Me, Windows NT4.0 SP3 or later, Windows 2000, or Windows XP...
  • Page 477 APPENDIX 33 ──────────────────────────────────────────────────── Appendix 8.1 Starting the Waveform Viewer In the Windows Start menu, select [Programs] - [HIOKI] - [Wv]. This starts the waveform viewer application. To close the waveform viewer application, in the [File] menu select [Exit]. You can also click the Close button at the top right corner of the window.
  • Page 478 APPENDIX 34 ──────────────────────────────────────────────────── Appendix 8.2 Waveform Viewer Menus The following is the complete menu tree of the waveform viewer application. File Open Save All Save Between Cursors Batch Conversion Exit View Toolbar Status Bar Wave Control Panel Properties Trace Block List Zoom In Zoom Out Set Magnification...
  • Page 479 APPENDIX 35 ──────────────────────────────────────────────────── Right-click with the mouse in the waveform display screen for the following functions. Right-click with Wave Control Panel the mouse Properties Trace Block List Zoom In Zoom Out Set Magnification Jump Trig A Cursor B Cursor Time Notation Point Trig Date...
  • Page 480 APPENDIX 36 ──────────────────────────────────────────────────── Appendix 8.3 Using the Waveform Viewer Waveform display To display a waveform it is first necessary to select the file to be displayed. In the [File] menu, select [Open], to display the file selection dialog box. Select a waveform file, and click Open to read in the file, and display the waveform.
  • Page 481 APPENDIX 37 ──────────────────────────────────────────────────── Changing waveform scale and position (Waveform Control Panel) You can adjust the display for each channel separately. In the [View] menu, select [Wave Control Panel] to display a dialog box. This indicate the list of channel. When a check mark is present the corresponding channel is displayed.
  • Page 482 APPENDIX 38 ──────────────────────────────────────────────────── Waveform jump function Select [View], then [Jump] to jump to the trigger position or the positions of the A or B cursors. Time Notation Select [View], then [Time Notation]. You can select the time notation on the waveform display screen.
  • Page 483 APPENDIX 39 ──────────────────────────────────────────────────── Appendix 8.4 Conversion to CSV Format You can convert displayed waveform data to a CSV format file. Once in CSV format, the file can be loaded into spreadsheet or other software for further processing. You can either convert the whole data file or a range selected with the cursors.
  • Page 484 APPENDIX 40 ──────────────────────────────────────────────────── Appendix 8.5 Batch Conversion You can convert multiple waveform files CSV files. 1. Select [File] from the menu bar, then select [Batch Conversion] from the File menu. 2. Select the desired files from the file list. To select two or more files, left- click on the desired files while holding down the Shift or Control key.
  • Page 485 INDEX 1 _____________________________________________________________________________________________ Index - A - - B - A/B cursor Back light saver 4,247 Beep sound 361,364,APPENDIX16 Accessories Binary 48,76,94,109,111,141,324,326,328,334 ACOS Blank panel Aliasing Block diagram 124,199,214,216,APPENDIX20 Block display 256,257,350 all clr 293,323,326 All out Bridge voltage Ambient conditions Analog trigger 219,226 - C -...
  • Page 486 INDEX 2 _____________________________________________________________________________________________ Cross Correlation (CCR) 129,158 - F - Cross Power Spectrum (CSP) 129,156 Cursor key 4,32,383 Custom Fall time 356,APPENDIX14 Cut-off frequency FEED key 214,216 4,31,307 119,199,326,372,APPENDIX19 - D - FFT ANALOG UNIT 28,199 File contents DC power adapter File name 5,10,13 76,94,110,141,189,325,328...
  • Page 487 INDEX 3 _____________________________________________________________________________________________ - I - - M - Impulse response [IMP] Magnification/compression ratio along time axis 129,159 171,253 Index file 115,326,APPENDIX37 Manual print INFO Manual trigger 4,34,219,244 INITIALIZE screen Maximum input voltage v,26-28,379,402 Input coupling 170,210,214 Maximum rated voltage v,26,379,402 Input level monitor Maximum recording length...
  • Page 488 INDEX 4 _____________________________________________________________________________________________ Reverse - P - Ripple components Rise time 356,APPENDIX14 Paint RM DIR Parallel RMS level trigger 361,364,376,APPENDIX16 219,236 Parallel operation RMS recorder function 240,380 RMS Spectrum [RMS] Partial print 129,148 Partial saving RMS value 88,219,236,APPENDIX11,APPENDIX13 Partial X-Y plot 55,252 Roll mode PC card...
  • Page 489 INDEX 5 _____________________________________________________________________________________________ STRAIN UNIT Vernier function 16,28,200 Subdirectory Version 279,APPENDIX33 Summing averaging VIEW function 52,137,APPENDIX12 System reset Voltage drop trigger 219,231 - T - - W - WARNING 361,364 APPENDIX2 Target WAVE DATA CLEAR 270,319 Text Waveform GO/NG evaluation 324,326,329 Time axis range Waveform parameter calculation...
  • Page 490 INDEX 6 _____________________________________________________________________________________________ ______________________________________________________________________________________________ Index...
  • Page 493 • In the interests of product development, the contents of this manual are subject to revision without prior notice. • The content of this manual is protected by copyright. No reproduction, duplication or modification of the content is permitted without the authorization of Hioki E.E. Corporation.
  • Page 494 HEAD OFFICE 81 Koizumi, Ueda, Nagano 386-1192, Japan TEL +81-268-28-0562 / FAX +81-268-28-0568 E-mail: os-com@hioki.co.jp / URL http://www.hioki.com/ HIOKI USA CORPORATION 6 Corporate Drive, Cranbury, NJ 08512, USA TEL +1-609-409-9109 / FAX +1-609-409-9108 8841A981-12 07-12H Printed on recycled paper...

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