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Fluke 8845A User Manual

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July 2006, Rev. 2, 6/08
© 2006, 2007, 2008 Fluke Corporation. Specifications subject to change without notice. All rights reserved.
All product names are trademarks of their respective companies.
8845A/8846A

Digital Multimeter

Users Manual
®

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Summary of Contents for Fluke 8845A

  • Page 1: Digital Multimeter

    ® 8845A/8846A Digital Multimeter Users Manual July 2006, Rev. 2, 6/08 © 2006, 2007, 2008 Fluke Corporation. Specifications subject to change without notice. All rights reserved. All product names are trademarks of their respective companies.
  • Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.

  • Page 3: Table Of Contents

    Table of Contents Chapter Title Page Introduction and Specifications............1-1 Introduction......................1-3 Manual Set ......................1-3 About this Manual ..................... 1-4 Safety Information ..................... 1-4 General Safety Summary................1-4 Symbols ......................1-6 Instrument Security Procedures ................. 1-6 Volatile Memory ................... 1-6 Non Volatile Memory..................
  • Page 4 Measurement Rates (IEEE488[4])..............1-22 Preparing the Meter for Operation ............. 2-1 Introduction......................2-3 Unpacking and Inspecting the Meter ..............2-3 Contacting Fluke....................2-3 Storing and Shipping the Meter ................. 2-3 Power Considerations ..................2-3 Selecting the Line Voltage ................2-4 Replacing the Fuses..................
  • Page 5 (continued) Contents Controlling System-Related Operations ............3-23 Identifying Meter Errors................3-23 Querying the Firmware for Revision Level........... 3-24 Adjusting Display Brightness................ 3-24 Setting the Meter’s Date and Time..............3-24 USB Operation ....................3-24 USB Storage Capacity and Write Time............3-24 USB Memory Device Compatibility and Special Instruction .......
  • Page 6 8845A/8846A Users Manual...
  • Page 7 Non-volatile Memory Space .................. 1-7 1-5. Accessories......................1-7 2-1. Line Voltage to Fuse Rating................... 2-5 2-2. Line Power Cord Types Available from Fluke ............2-7 3-1. Front-Panel Controls and Connectors ..............3-4 3-2. Display Elements ....................3-6 3-3. Rear-Panel Connectors................... 3-7...
  • Page 8 8845A/8846A Users Manual...
  • Page 9 Page 2-1. Replacing the Line Fuse..................2-5 2-2. Replacing the Current Input Fuses ................. 2-6 2-3. Line Power Cords Types Available from Fluke............. 2-7 2-4. Bail Adjustment and Removal ................2-8 3-1. TrendPlot Display ....................3-15 3-2. Histogram Display ....................3-16 4-1.
  • Page 10 8845A/8846A Users Manual viii...

  • Page 11: Introduction And Specifications

    Chapter 1 Introduction and Specifications Title Page Introduction......................1-3 Manual Set ......................1-3 About this Manual ..................... 1-4 Safety Information ..................... 1-4 General Safety Summary................1-4 Symbols ......................1-6 Instrument Security Procedures ................. 1-6 Volatile Memory ................... 1-6 Non Volatile Memory..................1-7 Media Memory (8846A Only)...............
  • Page 12 8845A/8846A Users Manual Diode Test ..................... 1-22 Measurement Rates (IEEE488[4])..............1-22...

  • Page 13: Introduction

    Introduction and Specifications Introduction Introduction The 8845A and 8846A are 6-1/2 digit, dual-display multimeters designed for bench-top, field service, and system applications. Their full complement of measurement functions plus its RS-232, IEEE 488, and Ethernet Remote Interfaces makes these multimeters ideal candidates for precision manual measurements and use in automated systems.

  • Page 14: About This Manual

    8845A/8846A Users Manual About this Manual This is the Users Manual for the 8845A and 8846A Digital Multimeters (hereafter referred to as the Meter). It contains all of the information a new user will need to operate the Meter effectively. The manual is divided into the following chapters: Chapter 1 “Introduction and Specifications”...
  • Page 15 Introduction and Specifications Safety Information Table 1-1. Safety Information XW Warning To avoid possible electric shock, personal injury, or death, read the following before using the Meter: Use the Meter only as specified in this manual, or the protection provided by the Meter might be impaired.

  • Page 16: Symbols

    Recycle Static awareness. Static discharge Do not dispose of this product as unsorted can damage part(s) municipal waste. Go to Fluke’s website for recycling information. Instrument Security Procedures This section describes the Meter’s memory elements and the procedures for clearing them.

  • Page 17: Non Volatile Memory

    2. Press the MANAGE MEMORY soft key. 3. Press the ERASE USB MEMORY soft key. Accessories Table 1-5 lists the available accessories for the 8845A and 8846A. Table 1-5. Accessories Model/Fluke PN Description TL71 Premium Test Lead Set 6303 Kelvin Probes...
  • Page 18 8845A/8846A Users Manual Table 1-5. Accessories (cont) Model/Fluke PN Description 884X-Case Black plastic case TL910 Precision Electronic Probe Set TL910 Precision Electronic Probe Set TL80A Basic Electronic DMM Test Set TL2X4W-PTII 2X4 Wire Ohms Test Lead TL2X4W-TWZ 2X4 Wire Ohms SMD Test Tweezer...

  • Page 19: General Specifications

    Introduction and Specifications General Specifications Table 1-5. Accessories (cont) Model/Fluke PN Description 1259340 Agreement, Calibration, Accredited 2441827 Agreement, Calibration, primary standards lab 1540600 Agreement, Calibration, artifact General Specifications Power Voltage 100 V Setting ............90 V to 110 V 120 V Setting ............108 V to 132 V 220 V Setting ............

  • Page 20: Memory

    8845A/8846A Users Manual Trigger Delay ............0 s to 3600 s; in 10 S increments External Trigger Delay ........<1 mS External Trigger Jitter ......... <500 S Trigger Input ............TTL Levels Trigger Output............. 5 V maximum (open collector) Memory 8845A..............

  • Page 21: Ac Voltage Specifications

    Introduction and Specifications Electrical Specifications Input Characteristics Resolution Range Resolution Input Impedance 4½ Digits 5½ Digits 6½ Digits 100 mV 100.0000 mV 100 nV 10 V 10 M or >10 G 1.000000 V 100 V 10 V 10 M or >10 G 10 V 10.00000 V 1 mV...

  • Page 22: Input Characteristics

    8845A/8846A Users Manual Additional Crest Factor Errors (<100 Hz).... Crest factor 1-2, 0.05 % of full scale Crest factor 2-3, 0.2 % of full scale Crest factor 3-4, 0.4 % of full scale Crest factor 4-5, 0.5 % of full scale Input Characteristics Resolution Range...
  • Page 23 Introduction and Specifications Electrical Specifications 8845A Accuracy Accuracy is given as (% measurement + % of range) Temperature 24 Hour 90 Days 1 Year Frequency Range Coefficient/ C (Hz) (23 1 C) (23 5 C) (23 5 C) Outside 18 to 28 C 100 mV 3 –...

  • Page 24: Resistance

    8845A/8846A Users Manual Resistance Specifications are for 4-wire resistance function, 2 x 4-wire resistance, or 2-wire resistance with zero. If zero is not used, add 0.2 for 2-wire resistance plus lead resistance, and add 20 m for 2 x 4-wire resistance function. Measurement Method ..........

  • Page 25: Dc Current

    Introduction and Specifications Electrical Specifications 8845A Accuracy Accuracy is given as (% measurement + % of range) Temperature 24 Hour 90 Days 1 Year Range Coefficient/ C (23 1 C) (23 5 C) (23 5 C) Outside 18 to 28 C 0.003 + 0.003 0.008 + 0.004 0.01 + 0.004...

  • Page 26: Ac Current

    8845A/8846A Users Manual Accuracy (8846A) Accuracy is given as (% measurement + % of range) Temperature 24 Hour 90 Days 1 Year Range Coefficient/ C (23 1 C) (23 5 C) (23 5 C) Outside 18 to 28 C 100 A 0.01 + 0.02 0.04 + 0.025 0.05 + 0.025...
  • Page 27 Introduction and Specifications Electrical Specifications Fast ..............200 Hz to 10 kHz Crest Factor Error (applies to non-sinusoidal waveforms only) Maximum Crest Factor ........5:1 at full scale Additional Crest Factor Errors (<100 Hz).... Crest factor 1-2, 0.05 % of full scale Crest factor 2-3, 0.2 % of full scale Crest factor 3-4, 0.4 % of full scale Crest factor 4-5, 0.5 % of full scale...
  • Page 28 8845A/8846A Users Manual 8846A Accuracy Accuracy is given as (% measurement + % of range) Temperature 24 Hour 90 Days 1 Year Frequency Range Coefficient/ C (Hz) (23 1 C) (23 5 C) (23 5 C) Outside 18 to 28 C 3 –...

  • Page 29: Frequency

    Introduction and Specifications Electrical Specifications 8845A Accuracy Accuracy is given as (% measurement + % of range) Temperature 24 Hour 90 Days 1 Year Frequency Range Coefficient/ C (Hz) (23 1 C) (23 5 C) (23 5 C) Outside 18 to 28 C 10 mA 3 –...
  • Page 30 8845A/8846A Users Manual 8846A Accuracy Accuracy is given as % measurement Temperature 24 Hour 90 Days 1 Year Range Frequency Coefficient/ C (23 1 C) (23 5 C) (23 5 C) Outside 18 to 28 C 100 mV to 3 – 5 Hz 0.005 [1][2] 1000 V...

  • Page 31: Capacitance (8846A Only)

    Introduction and Specifications Electrical Specifications Capacitance (8846A Only) Accuracy is stated as (% of measurement + % of range) 1 Year Accuracy Temperature Coefficient/ C Range Resolution (23 5 C) Outside 18 to 28 C 1 nF 1 pF 0.05 + 0.05 2.5 % 10 nF 10 pF...

  • Page 32: Diode Test

    8845A/8846A Users Manual Diode Test Test Current ............100 A or 1 mA Response Time............300 samples/sec with audible tone. Accuracy is given as (% measurements + % of range) Temperature 24 Hour 90 Days 1 Year Range Coefficient/ C (23 1 C) (23 5 C) (23 5 C)

  • Page 33: Preparing The Meter For Operation

    Preparing the Meter for Operation Title Page Introduction......................2-3 Unpacking and Inspecting the Meter ..............2-3 Contacting Fluke....................2-3 Storing and Shipping the Meter ................. 2-3 Power Considerations ..................2-3 Selecting the Line Voltage ................2-4 Replacing the Fuses..................2-4 Line-Power Fuse ..................
  • Page 34 8845A/8846A Users Manual...

  • Page 35: Introduction

    Fluke immediately. Save the container and the packing material in case you have to return the Meter. Contacting Fluke To order accessories, receive operating assistance, or get the location of the nearest Fluke distributor or Service Center, call: USA:...

  • Page 36: Selecting The Line Voltage

    3. Remove the fuse and replace with one rated appropriately for the selected line-power voltage. See Table 2-1. 4. Replace the selector block back into the fuse holder. XW Warning To avoid electric shock or fire, do not use makeshift fuses or short-circuit the fuse holder. Use only Fluke fuses...

  • Page 37: Current-Input Fuses

    The 400 mA input is protected by a fuse (F2) rated at 440 mA, 1000 V (fast blow), 10,000 A minimum breaking capacity (Fluke Part No. 943121). The 10 A input is protected by a fuse (F1) rated at 11 A, 1000 V (fast blow), 10,000 A minimum breaking capacity (Fluke Part No.
  • Page 38 8845A/8846A Users Manual If the fuse is good, the Meter will read less than 1 . If the fuse is blown, the Meter will read overload. To replace the Current Input fuses, 1. Turn the Meter off, unplug the power cord from the Meter, and remove all test leads.

  • Page 39: Connecting To Line Power

    First verify that the line voltage selection is set to the correct position, and then that the correct fuse for that line voltage is installed. Connect the Meter to a properly grounded three-prong outlet. Table 2-2. Line Power Cord Types Available from Fluke Type Voltage/Current...

  • Page 40: Turning Power-On

    8845A/8846A Users Manual Turning Power-On XW Warning To avoid electric shock, connect the Meter’s power cord to a power receptacle with proper earth ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation. With the proper line voltage selected and the appropriate power cord connected to the Meter, connect the power cord to a power outlet and switch rear-panel power switch so the “I”...

  • Page 41: Cleaning The Meter

    Preparing the Meter for Operation Cleaning the Meter Cleaning the Meter XW Warning To avoid electric shock or damage to the Meter, never get water inside the meter. W Caution To avoid damaging the Meter’s housing, do not apply solvents to the Meter.
  • Page 42 8845A/8846A Users Manual 2-10...

  • Page 43: Front-Panel Operation

    Chapter 3 Front-Panel Operation Title Page Introduction......................3-3 Controls and Indicators ..................3-4 Front-Panel Feature Descriptions ..............3-4 Display Panel....................3-5 Rear-Panel Connectors .................. 3-7 Adjusting the Meter’s Range................. 3-8 Navigating the Front-Panel Menu..............3-8 Configuring the Meter for a Measurement ............3-8 Setting the Beeper State.................
  • Page 44 8845A/8846A Users Manual Identifying Meter Errors................3-23 Querying the Firmware for Revision Level........... 3-24 Adjusting Display Brightness................ 3-24 Setting the Meter’s Date and Time..............3-24 USB Operation ....................3-24 USB Storage Capacity and Write Time............3-24 USB Memory Device Compatibility and Special Instruction ....... 3-25 Configuring the Remote Interface ..............

  • Page 45: Introduction

    Front-Panel Operation Introduction Introduction The Meter can be controlled either by sending commands through one of its communication interfaces or by manually operating its front panel controls. This chapter explains the function and use of the controls and indicators located on the front and rear panels of the Meter.

  • Page 46: Controls And Indicators

    8845A/8846A Users Manual Controls and Indicators Front-Panel Feature Descriptions Table 3-1 shows the Meter’s front-panel controls and connectors. Table 3-1. Front-Panel Controls and Connectors 6-1/2 DIGIT PRECISION MULTIMETER 8846A INPUT SENSE 2W/4W 1000 V CAT I 300V 600V CAT II FUSED BACK MEMORY...

  • Page 47: Display Panel

    Front-Panel Operation Controls and Indicators Table 3-1. Front-Panel Controls and Connectors (cont.) Item Description Memory key for accessing internal and external memory containing meter setups and measurements. See the “Accessing and Controlling Memory” section for more information. USB Port. Connection for optional memory device to store meter readings. Standby key to turn off the display.
  • Page 48 8845A/8846A Users Manual Table 3-2. Display Elements 100.0002 -0.4561 123.123. 123.123. ENTER caw02f.eps Item Description Primary display. Secondary display. Indicates PASS, HIGH or LOW for limits testing. Math function selected. Error detected. Memory enabled for storing readings. Extinguishes when last sample is stored. Softkey labels.

  • Page 49: Rear-Panel Connectors

    RS-232 400 mA TRIG I/O WARNING: N10140 SERIAL TAG TO AVOID ELECTRIC SHOCK GROUNDING CONNECTOR FLUKE CORPORATION MADE IN USA IN POWER CORD NO INTERNAL USER SERVICEABLE PARTS www.fluke.com REFER SERVICE TO QUALIFIED SERVICE PERSONNEL MUST BE CONNECTED caw05.eps Item...

  • Page 50: Adjusting The Meter's Range

    8845A/8846A Users Manual Adjusting the Meter’s Range The range keys, (URV), switch the Meter between auto and manual ranging. The presence or absence of MAN in the display indicates the Meter’s ranging mode. All functions utilize these keys to control the Meter’s range except continuity, diode test, temperature (8846A only), frequency and period, which only have a single range.

  • Page 51: Setting The Display Resolution

    Front-Panel Operation Configuring the Meter for a Measurement The beeper state is stored in non-volatile memory and does not change when the Meter is turned off or after a remote interface reset. The beeper is enabled when the Meter is shipped from the factory.

  • Page 52: Setting Continuity Resistance Threshold And Diode Test Parameters

    8845A/8846A Users Manual Note The 20 Hz filter is the power-up default selection. Setting Continuity Resistance Threshold and Diode Test Parameters The threshold resistance value for the continuity function and the amount of current and voltage used for Diode testing are adjustable. Continuity resistance threshold can be set to four different values: 1 , 10 , 100 and 1 k .

  • Page 53: Using The Analyze Functions

    Front-Panel Operation Using the Analyze Functions 2. Press the MORE soft key. 3. Press the HIGH INPUT Z soft key. The soft key label becomes highlighted to indicate high input Z is activated. Press the soft key again to disable the function. Using the Analyze Functions The Meter is capable of performing mathematical operations with measured values, as well as tracking a series of measurements.

  • Page 54: Testing Using Limits

    8845A/8846A Users Manual Stopping Measurement Collection There are two methods of stopping the collection of measurements for the statistics function. To manually stop the measurement collection, press the STOP soft key from the statistics menu. The display will update with the final set of statistical data. The process can also be stopped automatically by entering the number of samples on which you want to calculate statistics.

  • Page 55: Setting An Offset Value

    Front-Panel Operation Using the Analyze Functions With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character. The right most character is the multiplier. This character can be set to p, n, , m, k, M, or G. 5.

  • Page 56: Using Trendplot

    8845A/8846A Users Manual To make an mX+B calculation: 1. Press J. 2. Press the MATH soft key. 3. Press the €X+B soft key. To enter the M value: 4. Press the €X soft key To select the digit to adjust, press either <-- or -->. With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character.

  • Page 57: Using The Histogram Function

    Front-Panel Operation Using the Analyze Functions plot point. Previously laid down plot marks are adjusted down in size proportionally to the new vertical axis. The left section of the Meter’s display indicates the highest (maximum) and lowest (minimum) reading taken since the start of a TrendPlot session. In addition, the length of the TrendPlot session is displayed in hours, minutes, and seconds (hh:mm:ss).

  • Page 58: Controlling Trigger Functions

    8845A/8846A Users Manual caw056.eps Figure 3-2. Histogram Display In addition to the bar graph, the left third of the display also displays the number of samples, the average, and standard deviation values. To start a histogram session: 1. Set up the Meter for the desired measurement by selecting the function, and connecting the signal to the Meter’s input.

  • Page 59: Setting The Trigger Delay

    Front-Panel Operation Controlling Trigger Functions Note Setting the Meter to trigger via a remote command is only accessible through the remote interface. See the “Triggering” section in the Programmers Manual for more information on remote triggering. Auto Triggering In auto trigger mode, the Meter’s measurements are triggered by internal circuitry. These triggers are continuous and occur as fast as the configuration will allow.

  • Page 60: Setting The Number Of Samples

    USB port on the front panel of the Meter. Optional Memory in various storage capacities is available from Fluke. See the “Options and Accessories” section in Chapter 1 for Fluke part numbers. In addition to storing and recalling readings and configurations, a memory management function is available to delete files.
  • Page 61 Front-Panel Operation Controlling Trigger Functions 0.5993 caw032.eps 2. Press the STORE READINGS soft key shown above. 3. If not already highlighted, press the INTERNAL MEMORY soft key. 4. Press the #SAMPLES soft key. 5. To adjust the number of samples, press either <-- or --> to select a digit. With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character.

  • Page 62: Recalling Readings From Memory

    8845A/8846A Users Manual Note Each memory file will store up to 10000 readings. If the number of samples is set to a value greater than 10000, consecutive memory files will be used to store all the samples. If the readings fill the last file (999), reading storage will stop.

  • Page 63: Storing The Power-Up Configuration

    Front-Panel Operation Controlling Trigger Functions 4. To store the present Meter configuration in one of the first four memory locations, press the appropriate soft key. If you want to store the present Meter configuration in a location other than the first four locations, press the MORE soft key. The display indicates the next available memory location.

  • Page 64: Removing The Power-Up Configuration

    8845A/8846A Users Manual Removing the Power-up Configuration To remove the Meter’s stored power-up configuration: 4. Press M. 5. Press the STORE CONFIG softkey. 6. Press the REMOVE POWER-UP softkey. After removing the power-up configuration, power the Meter down and back up using the rear-panel power switch to restore factory default settings.

  • Page 65: Controlling System-Related Operations

    Front-Panel Operation Controlling System-Related Operations To copy the last or interrupted readings file from internal memory to an already-inserted USB memory device: 1. Press M. 2. Press the INIT MEAS TO USB soft key. The copy process will take several seconds. To erase USB memory, refer to the “Media Memory”...

  • Page 66: Querying The Firmware For Revision Level

    8845A/8846A Users Manual Querying the Firmware for Revision Level The Meter makes available the hardware version, software version, and serial number of the instrument. To view the versions and serial number: 1. Press I. 2. Press the soft key under SYSTEM. 3.

  • Page 67: Usb Memory Device Compatibility And Special Instruction

    Front-Panel Operation Configuring the Remote Interface If STOP is selected during storage to the USB device, readings in internal memory will be written directly to the device. Note that this may take several seconds. A USB memory device should never be removed while a write is occurring. The data is initially stored in internal memory and then transferred to the USB memory device.

  • Page 68: Resetting The Meter's Default Settings

    8845A/8846A Users Manual 0.5993 caw034.eps 3. Press the CAL DATE soft key to display the date the Meter was last calibrated. 4. Press B to go back to the previous menu. Note UNLOCK CAL allows entry of a password so authorized personnel can calibrate the Meter or change the (CAL) USER STRING.

  • Page 69: Making Measurements

    Chapter 4 Making Measurements Title Page Introduction......................4-3 Selecting Function Modifiers................4-3 Activating the Secondary Display ..............4-3 Measuring Voltage..................... 4-4 Measuring DC Voltage.................. 4-4 Measuring AC Voltage.................. 4-5 Measuring Frequency and Period ..............4-7 Measuring Resistance ..................4-7 Making a Two-wire Resistance Measurement ..........4-8 Making a Four-wire Resistance Measurement ..........
  • Page 70 8845A/8846A Users Manual...

  • Page 71: Introduction

    Making Measurements Introduction Introduction XW Warning To avoid possible electrical shock, and/or damage to the Meter, Read the safety information found in Chapter 1 before operating this meter. Do not apply more than 1000 volts between any terminal and earth ground. This chapter covers the steps for making a measurement with each of the Meter’s functions.

  • Page 72: Measuring Voltage

    8845A/8846A Users Manual Measuring Voltage The Meter is capable of measuring up to 1000 V dc, 750 V ac (8845A) or 1000 V ac (8846A). W Caution To avoid blowing the current fuses and possible damage to other equipment, do not apply voltage to the meter’s input until the test leads are properly connected to the input, and the proper voltage function selected.

  • Page 73: Measuring Ac Voltage

    Making Measurements Measuring Voltage is only available for dc functions at rates slower than 1 PLC. The number of readings averaged by the digital filter varies with dc function and range. A 3-pole analog filter for improving noise immunity. The filter is A FLTR active when this soft key label is highlighted and will increase stabilization time of the measurement.
  • Page 74 8845A/8846A Users Manual Function modifiers: Displays the filter menu. For best accuracy and stable readings, Filter choose a filter based on the lowest frequency to be measured and the performance needed. 3HZ SLOW Provides higher measurement accuracy on ac signals between 3 Hz and 20 Hz.

  • Page 75: Measuring Frequency And Period

    Making Measurements Measuring Frequency and Period Measuring Frequency and Period The Meter measures the frequency, or period of ac signals between 3 Hz and 1 MHz, applied between the Meter’s HI and LO connectors. The G key not only activates the Meter’s Frequency/Period function, but also toggles the Meter’s primary display between the signal’s frequency and period measurement.

  • Page 76: Making A Two-Wire Resistance Measurement

    8845A/8846A Users Manual will source current through the INPUT HI and LO terminals and use the SENSE HI and LO to measure the resistance. Making a Two-wire Resistance Measurement To make a two-wire resistance measurement: 1. Connect the test leads to the Meter’s input connectors as shown in Figure 4-1. 2.
  • Page 77 FRONT caw023.eps Figure 4-2. Input Connections for 4-wire Resistance Measurements To make a four-wire resistance measurement using Fluke’s 2X4 test leads: 1. Connect the test leads to the Meter’s input connectors as show in Figure 4-3. 2. Press N. 3. If not already highlighted, press the 2X4WIRE soft key.

  • Page 78: Measuring Current

    8845A/8846A Users Manual INPUT SENSE 2W/4W 1000 V CAT I 300V 600V CAT II FUSED Ground tab REAR FRONT caw060.eps Figure 4-3. Input Connections for 4-wire Ohms Using 2x4 Wire Leads Function modifiers: A filter for quieting noisy measurments. This filter averages readings D FLTR to reduce reading noise when in immedicate trigger mode or when in trigger mode with an unending number of triggers selected.

  • Page 79: Measuring Dc Current

    Making Measurements Measuring Current Current measurements expecting to be between 400 mA and 10 A are made using the Input LO and 10A input connectors as shown in Figure 4-5. I < 400 mA INPUT SENSE 2W/4W 1000 V CAT I 300V 600V CAT II FUSED...

  • Page 80: Measuring Ac Current

    8845A/8846A Users Manual 0.0086 caw09f.eps 3. With the test leads connected to the 400 mA and Input LO connectors, press the€A soft key as shown above, if not already highlighted. If the test leads are connected to the 10A and Input LO connectors, then press the 10A soft key. 4.

  • Page 81: Measuring Capacitance (8846A Only)

    (Input Lo and 400 ma or 10A) connectors. Measuring Capacitance (8846A only) The Fluke 8846A is capable of measuring capacitance from 1 pF to 100 mF (0.1 F). To make a capacitance measurement: 1. Press C. An example of the capacitance display is shown below.

  • Page 82: Measuring Rtd Temperature (8846A Only)

    Refer to the “Range Keys” section in Chapter 3 of this manual for information on how to adjust the measurement range. Measuring RTD Temperature (8846A only) The Fluke 8846A is capable of measuring temperatures between -200 C and 600 C using Resistance Temperature Detectors (RTDs). To make a temperature measurement: 1.

  • Page 83: Testing Continuity

    Making Measurements Testing Continuity - 246.645 º caw11f.eps To change the temperature scale, refer to the “Setting the Default Temperature Scale” section in Chapter 3 of this manual. Available scales are Celsius, Fahrenheit, and Kelvin. Refer to the “Adjusting the Meter’s Range” section in Chapter 3 of this manual for information on how to adjust the measurement range.

  • Page 84: Checking Diodes

    8845A/8846A Users Manual None Checking Diodes The diode function sends a current through a semiconductor junction while the Meter measures the voltage drop across the junction (or junctions). Measurements are displayed in the 10 V range at a relatively fast measurement rate. "OPEN" is displayed for voltages 10 % above the compliance voltage setting.

  • Page 85: Making A Triggered Measurement

    Making Measurements Making a Triggered Measurement Four soft keys allow changing the test voltage and current applied to the diode through the test leads. The compliance voltage is set to either 5 volts or 10 volts. The compliance current is set to either 1 mA or 0.1 mA. Press the appropriate soft key to select the desired voltage and current setting.

  • Page 86: Connecting An External Trigger

    8845A/8846A Users Manual 1. Press Lto display the measurement setup menu. 2. Press the TRIGGER soft key. 3. Press the soft key labeled #SAMPLES. 4. Use the soft keys to set the number of samples between 1 and 50,000. Select the digit in the value by pressing either <-- or -->. With the digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character.

  • Page 87: Appendices

    Appendices Appendix Title Page 2X4 Test Leads ....................A-1 Errors........................B-1 RS-232 Port Connections ..................C-1 Analog Filter Applications .................. D-1...
  • Page 88 8845A/8846A Users Manual...

  • Page 89: A 2X4 Test Leads

    2X4 Test Leads Introduction The optional Fluke TL2X4W test leads simplify making 4-wire ohms measurements by integrating the HI+HI Sense and LO+LO Sense test leads into one cable. The Meter’s Input HI and LO jacks consist of two contacts. One contact is connected to HI or LO input circuits and the other contact is connected to the Sense input circuits.
  • Page 90 8845A/8846A Users Manual...

  • Page 91: B Errors

    Appendix B Errors Introduction Listed below are the error messages the Meter uses to indicate a problem. AC Line frequency too high Invalid calibration step number *TRG/GET received but was ignored 488.2 I/O deadlock 488.2 interrupted query 488.2 query after indefinite response 488.2 unterminated command A fatal error occurred configuring the serial port A fatal error occurred opening the serial port...
  • Page 92 Error occurred when purging memory Error opening GPIB Controller Error setting GPIB Primary Address Error setting the RTC/System date Error setting the RTC/System time Ethernet port not available in Fluke 45 emulation mode Function/2nd func mismatch Function/math mismatch Function/range mismatch Generic Execution Error...
  • Page 93 Appendices Errors Incorrect packet size from inguard Info packet rec'd; link not active Inguard Calibration Constant write failed Inguard not responding (recv) Inguard not responding (send) INITiate received but was ignored Instrument configuration load failed Instrument configuration store failed Insufficient memory Invalid dimensions in a channel list Invalid parameter Invalid parameter...
  • Page 94 8845A/8846A Users Manual Serial buffer full Someone forgot to call begin (cal) Someone forgot to call begin (ICONF) Someone forgot to call begin (MCONF) Store reading to file failed String size is beyond limit Suffix Error. Wrong units for parameter Syntax error Time out while taking data Timeout error during calibration...

  • Page 95: Rs-232 Port Connections

    The Meter’s RS-232 control lines can be rewired to an alternate pairing instead of the RTS/CTS control pair. This alteration should be done by a trained technician at Fluke service center. Opening the cover of the Meter to make this alteration may void the...
  • Page 96 8845A/8846A Users Manual...

  • Page 97: D Analog Filter Applications

    Appendix D Analog Filter Applications Introduction The Meter’s analog filter is intended to reduce the presence of external ac when making dc measurements. Most applications do not require the use of this filter, but in some situations it can be utilized to improve DC measurements. A good example of this is using the filter when measuring the DC value of a signal with AC content, such as a DC power supply voltage that has significant AC line ripple present.
  • Page 98 8845A/8846A Users Manual Table D-2. Ohms Analog Filter Errors Range NPLC Additional Analog Filter Error 10, 100 0.5 m <10 1.9 m 10, 100 1.5 m <10 9.0 m 100 k 10, 100 <10 Table D-3. DC Current Analog Filter Errors Range NPLC Additional Analog Filter Error...
  • Page 99 DC Voltage, 4-4, 4-8, 4-10, 4-12 Clock Resistance, 4-8 setting date and time, 3-24 Firmware Configurations checking revision, 3-24 recalling, 3-22 Fluke storing, 3-20 contacting of, 2-3 Configure for Measurements, 3-8 Frequency meausrements, 4-7 Continuity Front Panel, 3-4 Setting of threshold, 3-10...
  • Page 100 8845A/8846A Users Manual —H— —O— Historgram, 3-15 Offset, setting of, 3-13 Options and Accessories, 1-7 —I— —P— Input Impedance, Automatic, 3-10 Inspecting Meter, 2-3 Period measurements, 4-7 Product Description, 1-3 —K— —R— Keys Range, 3-8 Range Key, 3-8 Soft, 3-4 Readings Soft, labels for, 3-6 recalling, 3-20...
  • Page 101 (continued) Index —U— Unpacking Meter, 2-3 User documentation, 1-3 —V— Voltage AC measurements, 4-5 DC measurements, 4-4...
  • Page 102 8845A/8846A Users Manual...
  • Page 103 8845A/8846A Users Manual This page is for holding the Reference Document (RD) fields. Do not remove from this master document. All RD fields will be placed after this text.

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