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digimess DS25 User Manual

Portable colour digital storage oscilloscope
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DS25 Colour Digital Storage Oscilloscope User Manual
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digimess
DS25
Portable Colour Digital Storage Oscilloscope
User's Manual
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  • Page 1 DS25 Colour Digital Storage Oscilloscope User Manual ® digimess DS25 Portable Colour Digital Storage Oscilloscope User's Manual...
  • Page 2 DS25 Colour Digital Storage Oscilloscope User Manual www.digimessinstruments.co.uk...
  • Page 3 DS25 Colour Digital Storage Oscilloscope User Manual Copyright 2006 Änderungen und Irrtümer vorbehalten. Nachdruck, auch auszugsweise, nur mit schriftlicher Genehmigung des Herstellers. Alle Rechte vorbehalten. Subject to alterations, errors excepted. Reprints, also in extracts, are only allowed with written permission of the manufacturer.
  • Page 4 DS25 Colour Digital Storage Oscilloscope User Manual WARRANTY The perfect working order of the oscilloscope is guaranteed for 12 months as from delivery. There is no warranty for faults arising from improper operation or from changes made to the oscilloscope or from inappropriate application.

  • Page 5: Table Of Contents

    General Safety Requirements ______________________________________________ 7 Safety Terms and Symbols_________________________________________________ 8 General Characteristics of the DS25 Colour Digital Storage Oscilloscope __________ 9 Junior User’s' Guidebook ________________________________________________ 10 Introduction to the Front Panel and the User's Interface of the DS series Oscilloscope __ 11...
  • Page 6 DS25 Colour Digital Storage Oscilloscope User Manual Persist ____________________________________________________________________ 50 XY Format ____________________________________________________________________ 50 How to Save and Recall a Wave Form __________________________________________ 52 Save and Recall the Wave Form _______________________________________________ 53 How to Carry out the Auxiliary System Function Setting __________________________ 54...

  • Page 7: General Safety Requirements

    DS25 Colour Digital Storage Oscilloscope User Manual General Safety Requirements Before operating, please read the following safety precautions to avoid any possible injury and prevent this product or any other products connected from damage. In order to avoid any contingent danger, this product is only to be used within the range specified.

  • Page 8: Safety Terms And Symbols

    DS25 Colour Digital Storage Oscilloscope User Manual Safety Terms and Symbols Terms in this manual. The following terms may appear in this manual: Warning. A warning statement indicates the conditions and actions which may endanger the life safety. Note. A note statement indicates the conditions and actions which may cause damage to this product or other property.

  • Page 9: General Characteristics Of The Ds25 Colour Digital Storage Oscilloscope

    DS25 Colour Digital Storage Oscilloscope User Manual General Characteristics of the DS25 Colour Digital Storage Oscilloscope Bandwidth of 25MHz; Record length of 6,000 points for each channel; Sampling rates of 100MS/s for each channel; Read-out with the cursor; Five automatic measurement functions;...

  • Page 10: Junior User's' Guidebook

    DS25 Colour Digital Storage Oscilloscope User Manual Junior User’s' Guidebook This chapter deals with the following topics mainly: Introduction to the front panel and the user’s interface of the DS series oscilloscope How to carry out general inspection How to carry out functional inspection...
  • Page 11 DS25 Colour Digital Storage Oscilloscope User Manual Introduction to the Front Panel and the User's Interface of the DS series Oscilloscope When you get a new-type oscilloscope, you should get acquainted with its front panel at first and the DS series digital storage oscilloscope is no exception. This chapter...
  • Page 12 DS25 Colour Digital Storage Oscilloscope User Manual Fig. 1 The Front Panel of a DS series Oscilloscope Function Buttons Adjustment Horizontal Trigger Back-light Vertical Control Connector Menu Selection Control Control Fig. 2 Explanatory Drawing for Operation of the DS series Oscilloscope...
  • Page 13 DS25 Colour Digital Storage Oscilloscope User Manual Fig. 3 Illustrative Drawing of Display Interfaces The Trigger State indicates the following information: Auto: The oscilloscope is under the Automatic mode and is collecting the waveform under the non-trigger state. Trig' d: The oscilloscope has already detected a trigger signal and is collecting the after-triggering information.
  • Page 14 DS25 Colour Digital Storage Oscilloscope User Manual It indicates the operation options for the current function menu, which changes with the function menus. The purple pointer shows the trigger level position. The reading shows the trigger level value. 10. The reading shows the trigger source.

  • Page 15: How To Carry On The General Inspection

    If it is found that there is damage to the appearance of the instrument, or the instrument does not work normally, or fails in the performance test, please get in touch with the digimess distributor responsible for this business. If there is damage to the instrument caused by the transportation, please keep the package.

  • Page 16: How To Carry Out The Function Inspection

    DS25 Colour Digital Storage Oscilloscope User Manual How to Carry out the Function Inspection Make a quick function check to verify the normal operation of the instrument, according to the following steps: 1. Connect the Instrument to the Power and Push down the Power Switch Button.
  • Page 17 DS25 Colour Digital Storage Oscilloscope User Manual Probe comp Fig. 5 Connection of the Probe 3. Press the AUTOSET Button. The square wave of 1 KHz frequency and 5V peak-peak value will be displayed in several seconds (see Fig. 6).

  • Page 18: How To Implement The Probe Compensation

    DS25 Colour Digital Storage Oscilloscope User Manual How to Implement the Probe Compensation When connecting the probe with any input channel for the first time, perform this adjustment to match the probe with the input channel. A probe which is not compensated or presents a compensation deviation will result in a measuring error or mistake.

  • Page 19: How To Set The Probe Attenuation Coefficient

    DS25 Colour Digital Storage Oscilloscope User Manual How to Set the Probe Attenuation Coefficient The probe has several attenuation coefficients, which will influence the vertical scale factor of the oscilloscope. If it is required to change (check) the set value of the probe attenuation coefficient, press the function menu button of the channels used, then push down the selection button corresponding to the probe till the correct set value is shown.

  • Page 20: How To Use The Probe Safely

    DS25 Colour Digital Storage Oscilloscope User Manual How to Use the Probe Safely The safety guard ring around the probe body protects your finger against the electric shock, shown as Fig. 10. Fig. 10 Finger Guard Warning: In order to avoid suffering from an electric shock, please keep your finger behind the safety guard ring of the probe body during operation.

  • Page 21: How To Implement Auto-Calibration

    DS25 Colour Digital Storage Oscilloscope User Manual How to Implement Auto-calibration The auto-calibration application can make the oscilloscope reach the optimum condition rapidly to obtain the most accurate measurement value. You can carry out this application program at any time, but when the range of variation of the ambient temperature is up to or over 5C, this program must be executed.

  • Page 22: Introduction To The Vertical System

    DS25 Colour Digital Storage Oscilloscope User Manual Introduction to the Vertical System Shown as Fig.11, there are a series of buttons and knobs in VERTICAL CONTROLS. The following practices will gradually direct you to be familiar with the use of the vertical setting.

  • Page 23: Introduction To The Horizontal System

    DS25 Colour Digital Storage Oscilloscope User Manual Introduction to the Horizontal System Shown as Fig.12, there are a button and two knobs in the “HORIZONTAL CONTROLS”. The following practices will gradually direct you to be familiar with the setting of the horizontal time base.

  • Page 24: Introduction To The Trigger System

    DS25 Colour Digital Storage Oscilloscope User Manual Introduction to the Trigger System Shown as Fig.13, there are a knob and four buttons in the “TRIGGER CONTROLS”. The following practices will direct you to be familiar with the setting of the trigger system gradually.

  • Page 25: Advanced User's Guidebook

    DS25 Colour Digital Storage Oscilloscope User Manual Advanced User's Guidebook You should already be familiar with the initial operations of “VERTICAL CONTROLS”, “HORIZONTAL CONTROLS” and “TRIGGER CONTROLS”, and the functions of the function areas, buttons and knobs in the front panel of the DS series oscilloscope.

  • Page 26: How To Set The Vertical System

    DS25 Colour Digital Storage Oscilloscope User Manual How to Set the Vertical System The VERTICAL CONTROLS includes three menu buttons such as CH1 MENU, CH2 MENU and MATH MENU, and four knobs such as VERTICAL POSITION , VOLTS/DIV ( one group for each of the two channels ).
  • Page 27 DS25 Colour Digital Storage Oscilloscope User Manual The description of the Channel Menu is shown in the following list: Function Menu Setting Description Coupling Block the AC component in the input signal. Unblock the AC and DC components in the input signal.
  • Page 28 DS25 Colour Digital Storage Oscilloscope User Manual Fig. 15 AC Coupling Fig. 16 DC Coupling...
  • Page 29 DS25 Colour Digital Storage Oscilloscope User Manual Setting the Channel “ON/OFF” Taking the Channel 1 for example, the operation steps are shown as below: (1). Press the CH1 MENU button and call out the CH1 SETUP menu. (2). Press the F2 menu selection button and select the Channel as OFF, with Channel 1 switched off.
  • Page 30 DS25 Colour Digital Storage Oscilloscope User Manual A List of the Attenuation Coefficients of Probes and the Corresponding Menu Settings. Attenuation Coefficient of the Probe Corresponding Menu Setting 10:1 100:1 100X 1000:1 1000X Setting of Wave Form Inverted Wave form inverted: the displayed signal is turned 180 degrees against the phase of the earth potential.
  • Page 31 DS25 Colour Digital Storage Oscilloscope User Manual Fig. 18 Wave Form not Inverted Fig. 19 Wave Form Inverted...

  • Page 32: Implementation Of Mathematical Manipulation Function

    DS25 Colour Digital Storage Oscilloscope User Manual Implementation of Mathematical Manipulation Function The Mathematical Manipulation function is used to show the results of the additive and subtraction operations between Channel 1 and Channel 2. Taking the additive operation between Channel 1 and Channels 2 for example, the operation steps are as follows: Press the MATH MENU button and call out the WAVE MATH menu.

  • Page 33: Application Of Vertical Position And Volts/Div Knobs

    DS25 Colour Digital Storage Oscilloscope User Manual Application of VERTICAL POSITION and VOLTS/DIV Knobs The .VERTICAL POSITION knob is used to adjust the vertical positions of the wave forms of all Channels (including those resulted from the mathematical operation). The analytic resolution of this control knob changes with the vertical division.

  • Page 34: How To Set The Horizontal System

    DS25 Colour Digital Storage Oscilloscope User Manual How to Set the Horizontal system The HORIZONTAL CONTROLS includes the HORIZONTAL MENU button and such knobs as HORIZONTAL POSITION and SEC/DIV. HORIZONTAL POSITION knob: this knob is used to adjust the horizontal positions of all channels (include those obtained from the mathematical manipulation), the analytic resolution of which changes with the time base.

  • Page 35: Main Time Base

    DS25 Colour Digital Storage Oscilloscope User Manual Main Time Base Press the F1 menu selection button and choose the Main Time Base. In this case, the HORIZONTAL POSITION and SEC/DIV knobs are used to adjust the main window. The display in the screen is shown as Fig. 23.

  • Page 36: Window Setting

    DS25 Colour Digital Storage Oscilloscope User Manual Window Setting Press the F2 menu selection button and choose Set Window. The screen will show a window area defined by two cursors. In this case, the HORIZONTAL POSITION and SEC/DIV knobs can be used to adjust the horizontal position and size of this window area (see Fig.

  • Page 37: Window Expansion

    DS25 Colour Digital Storage Oscilloscope User Manual Window Expansion Press the F3 menu selection button and choose Zone Window. As a result, the window area defined by two cursors will be expanded to the full screen size (see Fig. 25).

  • Page 38: How To Set The Trigger System

    DS25 Colour Digital Storage Oscilloscope User Manual How to Set the Trigger System When the oscilloscope begins to collect the data and display the wave form depends on a trigger. Once it is set correctly, the trigger can transfer the unstable display into a meaningful wave form.

  • Page 39: Trigger Control

    DS25 Colour Digital Storage Oscilloscope User Manual Trigger Control There are two trigger modes: Edge Trigger and Video Trigger. Each trigger mode uses different function menu. The switching between two modes can be implemented by pressing the F1 menu selection button.
  • Page 40 DS25 Colour Digital Storage Oscilloscope User Manual The Edge Trigger Menu is described as below: Function Menu Setting Description Slope Rising Set a trigger on the rising edge of the signal. Falling Set a trigger on the falling edge of the signal.
  • Page 41 DS25 Colour Digital Storage Oscilloscope User Manual Fig. 28 Wave Form Triggered on the Rising Edge Fig. 29 Wave Form Triggered on the Falling Edge...

  • Page 42: Video Trigger

    DS25 Colour Digital Storage Oscilloscope User Manual Video Trigger After choosing “Video Trigger”, a trigger is possible in field or line of NTSC, PAL or SECAM standard video signal. The operation menu of Video Trigger is shown as Fig. 30.
  • Page 43 DS25 Colour Digital Storage Oscilloscope User Manual Press the TRIG MENU button and get access to the trigger menu. Press the F1 menu selection button and choose Video for Type. Press the F2 menu selection button and choose Normal for Polarity.
  • Page 44 DS25 Colour Digital Storage Oscilloscope User Manual Fig. 31 Wave Form Triggered in the Video Field Fig. 32 Wave Form Triggered in the Video Line...

  • Page 45: How To Operate The Function Menu

    DS25 Colour Digital Storage Oscilloscope User Manual How to Operate the Function Menu The function menu control zone includes 6 function menu buttons and 3 immediate-execution buttons: SAVE/REL, MEASURE, ACQUIRE, UTILITY, CURSOR, DISPLAY, AUTOSET, RUN/STOP and HARDCOPY. How to Implement Sampling Setup Press the ACQUIRE button and the menu is displayed in the screen, shown as Fig.
  • Page 46 DS25 Colour Digital Storage Oscilloscope User Manual Change the ACQU Mode settings and observe the consequent variation of the wave form displayed. Fig. 34 Peak Detect mode, under which the burrs on the falling edge of the square wave can be detected and the noise is heavy.
  • Page 47 DS25 Colour Digital Storage Oscilloscope User Manual Fig. 35 Common ACQU Mode display, in which no burr can be detected. Fig. 36 The displayed wave form after the noise is removed under the Average Mode, in which the average number of 64 is set.

  • Page 48: How To Set The Display System

    DS25 Colour Digital Storage Oscilloscope User Manual How to Set the Display System Push down the DISPLAY button and the menu displayed in the screen is shown as Fig. 37. Fig. 37 Display Set Menu The description of the Display Set Menu is shown as follows:...
  • Page 49 DS25 Colour Digital Storage Oscilloscope User Manual Display Type: With the F1 menu selection button pushed down, you can shift between Vectors and Dots types. The differences between the two display types can be observed through the comparison between Fig. 38 and Fig.39.

  • Page 50: Persist

    DS25 Colour Digital Storage Oscilloscope User Manual Persist When the Persist function is used, the persistence display effect of the picture tube oscilloscope can be simulated: the reserved original data is displayed in fade color and the new data is in bright color. With the F2 menu selection button, different persistence time can be chosen: 1sec, 2sec, 5sec, Infinite and Closed.
  • Page 51 DS25 Colour Digital Storage Oscilloscope User Manual The following functions can not work in the XY Format: Reference or digital wave form Cursor Auto Set Time base control Trigger control Operation steps: Press the DISPLAY button and call out the Display Set Menu.

  • Page 52: How To Save And Recall A Wave Form

    DS25 Colour Digital Storage Oscilloscope User Manual How to Save and Recall a Wave Form Press the SAVE/REL button, you can save and call out the wave forms in the instrument. The menu displayed in the screen is shown as Fig. 42.

  • Page 53: Save And Recall The Wave Form

    DS25 Colour Digital Storage Oscilloscope User Manual Save and Recall the Wave Form The DS series oscilloscope can store four wave forms, which can be displayed with the current wave form at the same time. The stored wave form called out can not be adjusted.

  • Page 54: How To Carry On The Auxiliary System Function Setting

    DS25 Colour Digital Storage Oscilloscope User Manual How to Carry on the Auxiliary System Function Setting Press the UTILITY button and the menu is displayed in the screen as Fig. 45. Fig. 45 Function Menu The description of the Auxiliary Function Menu is shown as the following table.

  • Page 55: Do Self Cal (Self-Calibration)

    DS25 Colour Digital Storage Oscilloscope User Manual Do Self Cal (Self-Calibration) The self-calibration procedure can improve the accuracy of the oscilloscope under the ambient temperature to the greatest extent. If the change of the ambient temperature is up to or exceeds 5C, the self-calibration procedure should be executed to obtain the highest level of accuracy.
  • Page 56 DS25 Colour Digital Storage Oscilloscope User Manual The “SYS STAT” menu is described as the following table: Function Menu Setting Description Horizontal Show the horizontal parameter of the channel. Vertical Show the vertical parameter of the channel. Trigger Show the parameters of the trigger system.

  • Page 57: How To Conduct Automatic Measurement

    DS25 Colour Digital Storage Oscilloscope User Manual How to Conduct the Automatic Measurement With the Measure button pressed down, an automatic measurement can be implemented. There are 5 types of measurements and 4 measurement results can be displayed simultaneously. Press the F1 menu selection button to choose Source or Type menu. You can choose the channel to be measured from the Source menu and choose the measurement Type (Freq, Cycle, Mean, PK–PK, RMS and None).
  • Page 58 DS25 Colour Digital Storage Oscilloscope User Manual RMS of the Channel CH2, according the following steps: Press the F1 menu selection button and choose Source. Press the F2 menu selection button and choose CH1. Press the F3 menu selection button and choose CH1.

  • Page 59: How To Carry On The Cursor Measurement

    DS25 Colour Digital Storage Oscilloscope User Manual How to Carry on the Cursor Measurement Press the CURSOR button to display the cursor measurement function menu (CURS MEAS) in the screen, which includes Voltage Measurement and Time Measurement, shown as Fig. 50.

  • Page 60: Cursor Measurement

    DS25 Colour Digital Storage Oscilloscope User Manual Cursor Measurement When carrying out the cursor measurement, the position of Cursor 1 can be adjusted with the CURSOR 1 (VERTICAL POSITION) knob of Channel 1, and that of Cursor 2 can be adjusted with the CURSOR 2 (VERTICAL POSITION) knob of Channel 2.
  • Page 61 DS25 Colour Digital Storage Oscilloscope User Manual Carry out the following operation steps for the time cursor measurement of the channel CH1: Press “CURSOR” and recall the CURS MEAS menu. Press the F1 menu selection button and choose Time for Type, with two purple dotted lines displayed along the vertical direction of the screen, which indicating Cursor 1 and Cursor 2.

  • Page 62: How To Use Executive Buttons

    DS25 Colour Digital Storage Oscilloscope User Manual How to Use Executive Buttons The executive buttons include AUTOSET, RUN/STOP and HARDCOPY. AUTOSET This button is used for the automatic setting of all control values of the instrument to generate the wave form suitable for observation. Press the AUTOSET button and the oscilloscope will perform the fast automatic measurement of the signal.

  • Page 63: Examples Of Application

    DS25 Colour Digital Storage Oscilloscope User Manual Examples of Application Example 1: Measurement of Simple Signals Observe an unknown signal in the circuit, and display and measure rapidly the frequency and peak-to-peak value of the signal. Carry out the following operation steps for the rapid display of this signal: Set the probe menu attenuation coefficient as 10X and that of the switch in the probe switch as 10X.

  • Page 64: Example 2: Gain Of The Amplifier In The Metering Circuit

    DS25 Colour Digital Storage Oscilloscope User Manual Fig. 53 Waveform of Automation Measurement Example 2: Gain of the Amplifier in the Metering Circuit Set the probe menu attenuation coefficient as 10X and that of the switch in the probe as 10X.

  • Page 65: Example 3: Capture A Single Signal

    DS25 Colour Digital Storage Oscilloscope User Manual Press the F3 menu selection button and choose Pk-Pk. 10. Read the peak-to-peak values of Channel 1 and Channel 2 from the displayed menu (see Fig. 54). 11. Calculate the amplifier gain with the following formulas.
  • Page 66 DS25 Colour Digital Storage Oscilloscope User Manual of it in advance under the automatic or ordinary mode to determine the trigger level and the trigger edge. The operation steps are as follows: Set the probe menu attenuation coefficient to 10X and that of the switch in the probe to 10X.

  • Page 67: Example 4: Analyze The Details Of A Signal

    DS25 Colour Digital Storage Oscilloscope User Manual Fig. 55 Capture the Single Signal Example 4: Analyze the Details of a Signal Observe the Signal Containing Noises If the signal is interfered by the noise, the noise may cause a failure in the circuit. For...
  • Page 68 DS25 Colour Digital Storage Oscilloscope User Manual Fig. 56 Wave Form of the Signal Containing Noises Separate Noises from the Signal When analyze the wave form of a signal, you should remove the noise contained in it. For the reduction of the random noise in the oscilloscope display, please operate the instrument according to the following step: Press the ACQUIRE button to show the ACQU MODE menu.

  • Page 69: Example 5: Application Of X-Y Function

    DS25 Colour Digital Storage Oscilloscope User Manual Fig. 57 Wave Form of the Noise-Removed Signal Example 5: Application of X-Y Function Examine the Phase Difference between Signals of two Channels Example: Test the phase change of the signal after it passes through a circuit network.
  • Page 70 DS25 Colour Digital Storage Oscilloscope User Manual Push down the DISPLAY button and recall the DISP SET menu. Press the F3 menu selection button and choose XY for Format. The oscilloscope will display the input and terminal characteristics of the network in the Lissajous graph form.

  • Page 71: Example 6: Video Signal Trigger

    DS25 Colour Digital Storage Oscilloscope User Manual Example 6: Video Signal Trigger Observe the video circuit of a television, apply the video trigger and obtain the stable video output signal display. Video Field Trigger For the trigger in the video field, carry out operations according to the following steps: Press the TRIG MENU button to display the trigger menu.
  • Page 72 DS25 Colour Digital Storage Oscilloscope User Manual Push down the TRIG MENU button to display the trigger menu. Press the F1 menu selection button and choose Video. Press the F2 menu selection button and choose Normal for Polarity. Press the F3 menu selection button and choose CH1 for Source.

  • Page 73: Fault Treatment

    Check whether the power switch is pushed down to the designated position. Restart the instrument after complete the checks above. If the product still does not work normally, please contact your digimess representative. 2. After acquiring the signal, carry out the following operations if the wave form of the signal is not displayed in the screen.

  • Page 74: Appendix A: Technical Specifications

    DS25 Colour Digital Storage Oscilloscope User Manual automatically. 6. After the AVERAGE value sampling is set in the ACQU MODE or the a longer duration is set in the DISP MODE, the display rate is slowed down. It is a normal phenomenon.
  • Page 75 DS25 Colour Digital Storage Oscilloscope User Manual...
  • Page 76 DS25 Colour Digital Storage Oscilloscope User Manual Vertical A/D Converter Resolution of 8 bits, with the sampling carried out in two channels at the same time. Sensitivity (Volt/division) 5mV/div- 5V/div (at the input BNC) Range (V/div ) Displacement Range ± 10div (5mV- 5V )
  • Page 77 DS25 Colour Digital Storage Oscilloscope User Manual Trigger Trigger Sensitivity DC Coupling Channel 1 and Channel 2: 1div (DC to Full (Edge Trigger) Bandwidth ) 100mV(DC to Full Bandwidth) EXT/5 500mV(DC to Full Bandwidth) AC Coupling It is the same as the DC coupling in case of 50Hz or more.
  • Page 78 DS25 Colour Digital Storage Oscilloscope User Manual General Technical Specifications Display Display Type 7.8 inch Color LCD (Liquid Crystal Display) Display Resolution 640 (Horizontal) × 480 (Vertical) Pixels Display Colors 256 Colors Output of the Probe Compensator Output Voltage Approx 5V, with the Peak-to-Peak value equal to or (Typical ) greater than 1M of load.

  • Page 79: Appendix B: Enclosure

    DS25 Colour Digital Storage Oscilloscope User Manual Appendix B: Enclosure Standard Accessories: Passive probe: 2 pcs, 1.2 m, 1:1 (10:1) CDROM software USB cable Mains power cord. User's manual Options: DS25-BATT – Lithium battery Appendix C: Maintenance, Cleaning and Repair...

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