DS25 USER MANUAL - Digimess Instruments Ltd
Contents
1. Set Level to 50 Operation under the condition of input signal frequency gt Typical 50Hz Trigger Sensitivity Internal Peak to peak value of 2 divisions Video trigger typical EXT 400mV EXT 5 2V Signal System and Supports the NTSC PAL and SECAM broadcast systems Line Field Frequency for any field frequency of line frequency Video Trigger Type Measurement Cursor Measurement Voltage difference AV and time difference AT between cursors Automatic Peak to Peak Value Average RMS Frequency and Measurement Cycle Probe 1X Position 10X Position Bandwidth DC up to 4 MHz DC up to full bandwidth Attenuation Ratio 1 1 10 1 Compensation Range 10pf to 35pf Input Resistance IMQ 2 10MQ 2 Input Electric Capacity 85pf 115pf 14 5pf 17 5pf Input Voltage 150 V DC 300 V DC 77 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 x 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 1MQ of load Frequency Typical Square wave of IKHz Power Mains Voltage 100 240 VAC RMS 50Hz CAT II Power Consumption lt 15W Fuse 1A T grade 250V Environm2. Trig d M Pos 0 000ns TIME MODE Main TimeBase Set Window Zone Window CH1 10v CHZ 50 0mu M 500us CH1 400mu Fig 23 Main Time Base 35 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 24 Tin d M Pos 0 000ns U 0 000ns TIME MODE Main TimeBase Set Window Zone Window CH1 10v CH2 50 0mu 1 500us U 20 us CH1 400mu Fig 24 Window Setting 36 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 MIT M Pos 0 000ns W 0 000ns TIME MODE Main TimeBase Set Window Zone indow CH1 10u CH2 50 0mu M 500us W 20 us CH1 400mu Fig 25 Zone Window 37 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 When beginning to collect data the oscilloscope will collect adequate data
3. 2 Press the F1 menu selection button and select the Coupling item as AC to set the channel coupling as ac mode under which the direct current component in the signal will be blocked Then press the F1 menu selection button again and select the Coupling item as DC setting the channel coupling as dc mode under which both dc and ac components in the signal will be unblocked The wave forms are shown as Fig 15 and Fig 16 27 DS25 Colour Digital Storage Oscilloscope User Manual Trig a M Pos 0 000ns CH1 SETUP Coupling hom Channel ON Probe 1X Lnverted OFF CH1 2 0007 CH2 50 0mu M 500us CH1 2 484 Fig 15 AC Coupling Irig d M Pos 0 000ns CH1 SETUP Coupling bd Channel ON Probe 1X Lnverted OFF CH1 2 00u CH2 50 0mu MN 500us CH1 2 48v Fig 16 DC Coupling 28 DS25 Colour Digital Storage Oscilloscope User Manual 2 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 3 Press F2 menu selection button again select the channel as ON with Channel 1 is switched on Regulate the Attenuation Ratio of the Probe In order to match the attenuation coefficient of the probe it is required to adjust the attenuation ratio coefficient of the
4. 50ms the horizontal time base can be expanded for 4 divisions downwards HARDCOPY Press the HARDCOPY button and the oscilloscope will transmit the current screen display to the computer connected with it The receiving software should be installed in the superior computer which should be connected the through the RS232 interface 62 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 1 Carry out the following operation steps for the rapid display of this signal 1 Set the probe menu attenuation coefficient as 10X and that of the switch in the probe switch as 10X 2 Connect the probe of Channel 1 to the measured point of the circuit 3 Push down the AUTOSET button The oscilloscope will implement the AUTOSET to make the wave form optimized based on which you can further regulate the vertical and horizontal divisions till the waveform meets your requirement 2 Perform Automatic Measurement The oscilloscope can measure most displayed signals automatically Complete the following operations for the measurement of frequency cycle mean and peak to peak value 1 Press the MEASURE button to show the automatic measurement function menu 2 Press the Fl menu selection button and choose Source with the Source menu displayed
5. Type Time Source CH1 Delta 1 163KHZ 0 860ns Cursor 1 0 000ns Cursor 2 0 860ns CH1 10u CH2 50 0mu M 500us CH1 400mu Fig 52 Wave Form of Cursor Measurement 61 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 The function items of AUTOSET are shown as the following table Function Items Setting Acquisition Mode Current Vertical Coupling DC Vertical Scale Adjust to the proper division Bandwidth Full Horizontal Level Middle Horizontal Sale Adjust to the proper division Trigger Type Current Trigger Source Show the minimum number of channels Trigger Coupling Current Trigger Slope Current Trigger Level Mid point Setting Trigger Mode Auto Display Format YT RUN STOP Enable or disable the waveform sampling Notice Under the Stop state the vertical division and the horizontal time base of the wave form can be adjusted within a certain range in other words the signal can be expanded in the horizontal or vertical direction When the horizontal time base equal to or is less than
6. measurement functions Color liquid crystal display with high resolution and high contrast including adjustable back light Store and recall waveforms Automatic setting function provides fast set up Multiple waveform calculation function Detect average and peak values of a waveform Digital real time oscilloscope Edge and video triggering function USB communication ports Different continuous display times User interface in two languages 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 How to make a probe compensation How to set the probe attenuation coefficient How to use the probe safely How to implement an auto calibration Introduction to the vertical system Introduction to the horizontal system Introduction to the trigger system 10 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 makes a simple description of the operation and function of the front panel of the DS series oscilloscope enabling you t
7. probe or testing wire freely Product Grounding This product is grounded through the power lead grounding conductor In order to prevent any electric shock the grounding conductor must be connected to the ground It requires guarantee that this product has been already grounded correctly before any connection with its input or output terminal Connect the probe correctly The grounding end of the probe corresponds to the grounding phase Please don t connect the grounding end to the positive phase Pay attention to the nominal values of all terminals In order to prevent any fire or electric shock risks please pay attention to all the nominal values and marks of this product Before implement any connections for this product please read the user s manual of this product to understand the information about the rated values further Do not operate without the instrument cover installed If the cover or panel has already been removed please don t operate this product Use the proper fuse Only the fuse complying with the specified type and nominal value for this product can be used Avoid touching any exposed circuit When the product is on power please don t touch the uncovered contacts and parts Please do not operate if a fault is suspected If suspecting damage to this product please contact the qualified maintenance personnel for check Keep a good ventilation condition Please consult the detailed installation instruction in the us
8. probe through the operating menu of the Channel accordingly If the attenuation coefficient of the probe is 1 1 that of the oscilloscope input channel should also be set to 1X to avoid any errors presented in the displayed scale factor information and the measured data Take the Channel 1 as an example the attenuation coefficient of the probe is 1 1 the operation steps is shown as follows 1 Press the CH1 MENU button access CH1 SETUP menu 2 Press the F3 menu selection button and select 1X for the probe The Figure 17 illustrates the setting and the vertical scale factor when the probe of the attenuation coefficient of 1 1 is used Trig d M Pos 0 000ns CH1 SETUP Coupling AC Channel ON Probe E Lnverted OFF CH1 2 0007 CH2 50 0mu M 500us CH1 2 48v Fig 17 Regulation of the Attenuation Ratio of the Probe 29 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 1 1 IX 10 1 10X 100 1 100X 1000 1 1000X 5 Setting of Wave Form Inverted Wave form inverted the displayed signal is turned 180 degrees against the phase of the earth potential Taking the Channel 1 for example the operation steps are shown as follows 1 Press the CH1 MENU button and get access to the CH1 SETUP menu 2 Press the F4 menu select
9. to 10X and that of the switch in the probe to 10X Adjust the VOLTS DIV and SEC DIV knobs to set up a proper vertical and horizontal ranges for the signal to be observed Press the button ACQUIRE to display the ACQUIRE Mode menu Press the F2 menu selection button and choose Peak Detect Press the TRIG MENU button to display the Trigger Mode menu Press the F1 menu selection button and choose Edge as the trigger type Press the F4 menu selection button and choose Single as the trigger mode Press the F2 menu selection button and choose Rising as the slope Rotate the LEVEL knob and adjust the trigger level to the mid value of the signal to be measured If the Trigger State Indicator at the top of the screen does not indicate Ready push down the RUN STOP button and start Acquire waiting the emergence of the signal in conformity with the trigger conditions If a signal reaches to the set trigger level one sampling will be made and then displayed in the screen With this function any random occurrence can be captured easily Taking the burst burr of larger amplitude for example set the trigger level to the value just greater than the normal signal level and then push down the RUN STOP button and wait When there is a burr occurring the instrument will trigger automatically and record the wave form generated during the period around the trigger time With the HORIZONTAL POSITION knob in the horizontal control area in the panel rotated
10. to draw the wave form at the left side of the trigger point at first It will continuously perform the data acquisition while waiting for the trigger condition After a trigger is detected the oscilloscope will continuously collect data enough to draw the wave form at the right side of the trigger point One knob and four function menu buttons are included in the trigger control zone LEVEL Trigger the level control knob and set the signal voltage corresponding to the trigger point SET TO 50 Set the trigger level as the vertical mid point value of the amplitude of the trigger signal FORCE TRIG It is a force trigger button for the generation of a trigger signal which is mainly used in the Normal and Single triggering modes TRIG VIEW Trigger the resetting of the horizontal position TRIG MENU It is a trigger menu button When it is pressed an operation menu will be presented in the screen shown as Fig 26 TRIG MODI Fig 26 Trigger Mode Menu 38 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 Edge Trigger It happens when the trigger input passes through a given level along the set direction Video Trigger Carry out the field or line video trigger of the standard video signal
11. you can change the horizontal position of the trigger position to obtain the negative delay making an easy observation of the waveform before the burr occurs see Fig 55 66 DS25 Colour Digital Storage Oscilloscope User Manual STOP M Pos 0 000ns TRIG MODE i i Tyne Edge Slope Rising Source CH1 Coupling DC CH1 Zu CH2 1 00u M 1 0ns CH1 256my 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 the analyzing of the noise in detail please operate the instrument according to the following steps 1 Press the ACQUIRE button to display the ACQU MODE menu 2 Press the F2 menu selection button and choose Peak Detect In this case the screen display contains the wave form of a random noise Especially when the time base is set as Low Speed then noise peak and burr contained in the signal can be observed with the peak detection See Fig 56 67 DS25 Colour Digital Storage Oscilloscope User Manual Trig d M Pos 280 0us ACQU MODE Sample Peaki etect Average Averages 16 CH1 500mu CH2 20v M 500us CH1 1 34v 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 oscillos
12. 3 Press the F2 F3 F4 and F5 menu selection buttons and choose CH1 4 Press the Fl menu selection button again and choose Type with the Type menu displayed Press the F2 menu selection button and choose Freq Press the F3 menu selection button and choose Period Press the F4 menu selection button and choose Mean 9o En ON eA Press the F5 menu selection button and choose Pk Pk Then the frequency cycle mean and peak to peak value will present in the menu and change periodically see Fig 53 63 DS25 Colour Digital Storage Oscilloscope User Manual Trig d M Pos 0 000ns MEASURE Source Type CH1 Freq 1 169KHZ CH1 Period 0 856ns CHZ Mean OFF CH2 PK PK CH1 10u CHZ 50 Omu M 500us gt CH1 400nu 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 Connect the oscilloscope CH1 channel with the circuit signal input end and the CH2 channel to the output end Operation Steps 1 Push down the AUTOSET button and the oscilloscope will automatically adjust the waveforms of the two channels into the proper display state Push down the MEASURE button to show the MEASURE menu 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 CH2 Press the F1 menu selectio
13. DS25 Colour Digital Storage Oscilloscope User Manual Jiai DS25 Portable Colour Digital Storage Oscilloscope User s Manual DS25 Colour Digital Storage Oscilloscope User Manual www digimessinstruments co uk DS25 Colour Digital Storage Oscilloscope User Manual OCopyright 2006 nderungen und Irrt mer 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 All rights reserved 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 If a fault occurs please contact or send your oscilloscope to Agents details The oscilloscope should be sent in appropriate packing if possible in the original packing Please enclose a detailed fault report functions working incorrectly deviating specifications and so on including unit type and serial number Would you also kindly verify warranty cases by enclosing your supply delivery note Any repairs carried out without reference to a valid warranty will initially be at the owner s expense Should the warranty have expired we will of course be g
14. L POSITION knob to adjust the horizontal position of the signal in the waveform window The HORIZONTAL POSITION knob is used to control the triggering displacement of the signal or for other special applications If it is applied to triggering the displacement it can be observed that the wave form moves horizontally with the knob when you rotate the Horizontal Position knob 3 With the HORIZONTAL MENU button pushed down you can set and initiate the Window Expansion 23 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 Fig 13 Trigger Control Zone 1 Press the TRIG MENU button and call out the trigger menu With the operations of the 5 menu selection buttons the trigger setting can be changed 2 Use the LEVEL knob to change the trigger level setting With the rotation of the LEVEL knob it can found that the trigger indicator in the screen will move up and down with the rotation of the knob With the movement of the trigger indicator it can be observed that the trigger level value displayed in the screen changes 3 Press the button SET TO 50 to set the trigger level as the vertical mid point values of the amplitude of the trigger signal 4 Press the FORCE TRIG bu
15. S DIV VERTICAL POSITION and SEC DIV knobs to obtain the proper wave form display see Fig 60 M Pos 0 000ns 1 R G MC l Nr CH1 All Fig 60 Wave Form Obtained from the Video Line Trigger 72 DS25 Colour Digital Storage Oscilloscope User Manual Fault Treatment 1 In the case of that the oscilloscope is still in the black screen state without any display after the power is switch on implement the following fault treatment procedure Check whether the power connection is connected properly 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 Check whether the probe is properly connected to the signal connecting wire Check whether the signal connecting wire is correctly connected to the BNC namely the channel connector Check whether the probe is properly connected with the object to be measured Check whether there is any signal generated from the object to be measured the trouble can be shot by the connection of the channel from which there is a signal generated with the channel in fault Make the signal acquisition operation again 3 The measured voltage amplitude value is 10 times greater or smaller than the actual
16. Slop Auto for Mode and DC for Coupling The operation steps are as follows 1 Press the TRIG MENU button and call out the trigger menu Press the F1 menu selection button and select Edge for Type Press the F2 menu selection button and select Rising for Slope Press the F4 menu selection button and choose Auto for Mode 2 3 4 Press the F3 menu selection button and choose CHI for Source 5 6 Press the F5 menu selection button and choose AC for Coupling The display in the screen is as Fig 28 7 Press the F2 menu selection button again and choose Falling for Slope For the screen display see Fig 29 40 DS25 Colour Digital Storage Oscilloscope User Manual Trig d M Pos 0 000ns TRIG MODE Type Edge Source CH1 Mode Auto Coupling DC CH1 10v CHZ 50 0mu M 500us CH1 400nu CH1 0 00 divs 0 0mv Fig 28 Wave Form Triggered on the Rising Edge Irig d M Pos 0 000ns TRIG MODE Type Edge Slone ar Source CH1 Mode Auto Coupling AC CH1 10u CHZ 50 0mu M 500us CH1 400mu Fig 29 Wave Form Triggered on the Falling Edge 41 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 Fig 30 Video Trigger Menu The description of the Video Trigger menu is shown the following t
17. The Edge and Video Trigger menus are described respectively as below Edge Trigger Under the Edge Trigger mode a trigger happens in the trigger threshold value of the input signal edge When the Edge Trigger is selected a trigger will occur in the rising or falling edge of the input signal The Edge Trigger Menu is shown as Fig 27 Fig 27 Edge Trigger Menu 39 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 Source CHI Set Channel 1 as the trigger signal of the source CH2 Set Channel 2 as the trigger signal of the source EXT Set the external trigger channel as the trigger signal of the source EXT 5 Divide the External Trigger Source by 5 to expand the external trigger level range Mode Auto Collect the wave form even if there is not trigger condition is detected Normal Collect the wave form only when the trigger condition is fulfilled Single Collect a wave form when a trigger is detected then stop sampling Coupling DC Block the direct current component AC Unblock all components HF Rjc Block the high frequency signal and only unblock the high frequency component LF Rjc Block the low frequency signal and only unblock the low frequency component Make such settings in Channel 1 as Rising for
18. User Manual Trig a M Pos 280 0us ACQU MODE Peak Detect Average Averages 16 CH1 500mu CH2 20v M 500us 2 CHI 1 3540 Fig 35 Common ACQU Mode display in which no burr can be detected Trig d M Pos 280 0us ACQU MODE Sample Peak Detect Q4 o Averages fl CH1 500mu CH2 20v M 500us CH1 1 34v Fig 36 The displayed wave form after the noise is removed under the Average Mode in which the average number of 64 is set 47 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 Function Menu Setting Description Type Vectors The space between the adjacent sampling points in the display is filled with the vector form Dots Only the sampling points are displayed Persist OFF Set the persistence time for each sampling point I sec 2sec 5sec Infinite Format YT Show the relative relation between the vertical voltage and the horizontal time XY Channel 1 is displayed on the horizontal axis and Channel 2 on the vertical axis Carry Bitmap The data transmitted in communication are in the bitmap form Vectors The data transmitted in communication are in the vector form 48 DS25 Colour Digital Storage Oscilloscope User Manual Display Type With the F1 men
19. WE GE CH1 2 00u CH2 2 00v M 50 us CH1 80 0mu Fig 20 Wave Form resulted from CH1 CH2 Mathematical Manipulation The corresponding FCL Functional Capabilities List of the Wave Form Calculation Setting Description CH1 CH2 Subtract the Channel 2 wave form from the Channel 1 wave form CH2 CHI Subtract the Channel 1 wave form from the Channel 2 wave form CH1 CH2 Add the Channel 1 wave form to the Channel 2 32 DS25 Colour Digital Storage Oscilloscope User Manual Application of VERTICAL POSITION and VOLTS DIV Knobs 1 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 2 The VOLTS DIV knob is used to regulate the vertical resolution of the wave forms of all channels including those obtained from the mathematical manipulation which can determine the sensitivity of the vertical division with the sequence of 1 2 5 The vertical sensitivity goes up when the knob is rotated clockwise and goes down when the knob is rotated anticlockwise 3 When the vertical position of the channel wave form is adjusted the screen shows the information concerning the vertical position at the lower left corner see Fig 21 Trig d M Pos 0 000ns MEASURE Source Type CH1 Freq 1 168KHZ CH1 PK PK 51 36v CHZ Me
20. able Function Menu Setting Description Polarity Normal Applicable to the video signal of low black level Inverted Applicable to the video signal of high black level Source CHI Set Channel 1 as the trigger signal of the source CH2 Set Channel 2 as the trigger signal of the source EXT Set the external input channel as the trigger signal of the source EXT 5 Divide the external trigger source by 5 and expand the external trigger level range Sync Line Set a trigger synchronization in the vide line Field Set a trigger synchronization in the video field The operation steps for setting Channel 1 in Video Trigger Mode are as below 42 DS25 Colour Digital Storage Oscilloscope User Manual 1 Press the TRIG MENU button and get access to the trigger menu 2 Press the F1 menu selection button and choose Video for Type 3 Press the F2 menu selection button and choose Normal for Polarity 4 Press the F3 menu selection button and choose CHII for Source 5 Press the F4 menu selection button and choose Field for Sync The screen display is shown as Fig 31 6 Press the F4 menu selection button again and choose Line for Slope The screen display is shown as Fig 32 43 DS25 Colour Digital Storage Oscilloscope User Manual E Mig d M Pos 280 0us TRIG MODE Type Video Polarity Normal Source CH1 Sync CH1 5u CH2 20v M 200us CH1 0 72divs 3 60v Fig 31 Wave Form Triggered in the Vi
21. an OFF CHZ Cyc RMS OFF CH1 20u CHZ 50 Omu M 500us CH1 24 80 CH1 1 00 divs 20 00v Fig 21 Information about Vertical Position 33 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 1 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 2 SEC DIV knob it is used to set the horizontal scale factor for setting the main time base or the window 3 HORIZONTAL MENU button with this button pushed down the screen shows the operating menu see Fig 22 Main Fig 22 Time Base Mode Menu The description of the Horizontal Menu is as follows Function Menu Setting Description Main Time Base The setting of the horizontal main time base is used to display the wave form Window Setup A window area is defined by two cursors Window The defined window area for display is Expansion expanded to the full screen 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
22. ange of variation of the ambient temperature is up to or over 5C this program must be executed For the performing of the self calibration all probes or wires should be disconnected with the input connector first Then press the UTILITY button to call out the FUNCTION menu push down the F3 menu selection button to choose the option Do Self Cal finally run the program after confirming that everything is ready now 21 DS25 Colour Digital Storage Oscilloscope User Manual Introduction to the Vertical System Shown as Fig ll 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 Fig 11 Vertical Control Zone 1 Use the button VERTICAL POSITION knob to show the signal in the center of the waveform window The VERTICAL POSITION knob functions the regulating of the vertical display position of the signal Thus when the VERTICAL POSITION knob is rotated the pointer of the earth datum point of the channel is directed to move up and down following the wave form Measuring Skill If the channel is in the DC coupling mode you can rapidly measure the DC component of the signal through the observation of the difference between the wave form and the signal ground If the channel is in the AC mode the DC component will be removed by filtration This mode helps you display the AC component of the signal with a h
23. annel Only if the wave form channel is in the ON state can the measurement be carried out No automatic measurement can be made for the saved or the mathematically manipulated wave form or in the XY or Scan format Measure the frequency the peak to peak value of the Channel CH1 and the mean the 57 DS25 Colour Digital Storage Oscilloscope User Manual RMS of the Channel CH2 according the following steps 1 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 Press the F4 menu selection button and choose CH2 Press the F5 menu selection button and choose CH2 2 3 4 5 6 Press the Fl menu selection button and choose Type 7 Press the F2 menu selection button and choose Freq 8 Press the F3 menu selection button and choose Pk Pk 9 Press the F4 menu selection button and choose Mean 10 Press the F5 menu selection button and choose Cyc RMS The measured value will be displayed in the reading window automatically see Fig 49 Irig d M Pos 0 000ns MEASURE Source Type CH1 Freq 1 182KHZ CH1 PK PK 52 00v CHZ Mean 240 Omu CHZ Cyc RMS 1 6220 CH1 20u CHZ 2 00u M 500us CH1 24 00 CH1 1 04 divs 20 80v Fig 49 Automatic Measurement 58 DS25 Colour Digital Storage Oscilloscope User Manual How to Carry on the Cursor Measurement Press the CURSOR button to display the cursor measuremen
24. ase carry out the following steps 1 Set the attenuation coefficient of the probe in the menu as 10X and that of the switch in the probe as 10X and connect the oscilloscope probe with the CHI channel If a probe hook tip is used ensure that it keeps in close touch with the probe Connect the probe tip with the signal connector of the probe compensator and connect the reference wire clamp with the ground wire connector of the probe connector and then press the button AUTOSET see Fig 5 2 Check the displayed wave forms and regulate the probe till a correct compensation is achieved see Fig 7 and Fig 8 Overcompensated Compensated correctly Under compensated Fig 7 Displayed Wave Forms of the Probe Compensation 3 Repeat the steps mentioned if necessary Fig 8 Adjust Probe 18 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 This setting will be valid all the time before it is changed again AN Note The attenuation coefficient of the probe in the menu is preset to 10X when the oscilloscope is delivered from the fac
25. cope display please operate the instrument according to the following step Press the ACQUIRE button to show the ACQU MODE menu 2 Press the F3 menu selection button and choose Average 3 Press the F4 menu selection button and observe the wave form obtained from averaging the wave forms of different average number After the averaging the random noise is reduced and the detail of the signal is easier to be observed Shown as follows after the noise is removed the burrs on the rising and falling edges appears see Fig 57 68 DS25 Colour Digital Storage Oscilloscope User Manual Trig d M Pos 280 0us ACQU MODE Sample Peak Detect Averages m CH1 500mu CH2 20v NM 500us CH1 1 34v 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 Connect the oscilloscope with the circuit and monitor the input and output signals of the circuit For the examination of the input and output of the circuit in the form of X Y coordinate graph please operate according to the following steps 1 Set the probe menu attenuation coefficient for 10X and that of the switch in the probe for 10X 2 Connect the probe of channel 1 to the input of the network and that of Channel 2 to the output of the network 3 Push down the AUTOSET button wit
26. d by transportation If it is found that the packaging carton or the foamed plastic protection cushion has suffered serious damage do not throw it away until the complete device and its accessories satisfy the electrical and mechanical property tests 2 Check the Accessories The supplied accessories have been already described in the Appendix B Accessories of this Manual You can check whether there is any loss of accessories with reference to this description If it is found that there is any accessory lost or damaged please get in touch with the distributor of digimess responsible for this service 3 Check the Complete Instrument 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 15 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 The instrument carries out all self check items and shows the prompt Press any Key Enter the Operating Mode Press the UTILITY button to get access to the FUNCTION menu and push down F2 the
27. deo Field 0 Trig a M Pos 0 000ns TRIG MODE Type Video Polarity Normal Source CH1 Sync Line CH1 5v CH2 20v M 20 us Nr CH1 All REO Fig 32 Wave Form Triggered in the Video Line 44 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 33 Fig 33 ACQU MODE Menu The description of the Sampling Setup Menu is shown as follows Function Menu Setting Description Sampling General sampling mode Peak Detection It is used for the detection of the jamming burr and the possibility of reducing the confusion Average value It is used to reduce the random and don t care noises with the optional number of averages Averages 4 16 64 Choose the number of averages 128 45 DS25 Colour Digital Storage Oscilloscope User Manual Change the ACQU Mode settings and observe the consequent variation of the wave form displayed M Pos 280 0us A C U NK l 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 46 DS25 Colour Digital Storage Oscilloscope
28. e with two purple dotted lines displayed along the horizontal direction of the screen which indicating CURSOR 1 and CURSOR 2 3 Press the F2 menu selection button and choose CH1 for Source 4 Adjust the positions of CURSOR 1 and CURSOR 2 according to the measured wave form with the absolute value of the voltage amplitude difference between Cursor 1 and Cursor 2 displayed in the increment window The current position of Cursor 1 is displayed in the Cursor 1 window and that of Cursor 2 is displayed in the Cursor 2 window see Fig 51 lrig d M Pos 0 000n CURS MEAS CH1 400mv Fig 51 Wave Form of Voltage Cursor Measurement 60 DS25 Colour Digital Storage Oscilloscope User Manual Carry out the following operation steps for the time cursor measurement of the channel CH1 1 Press CURSOR and recall the CURS MEAS menu 2 Press the Fl 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 3 Press the F2 menu selection button and choose CH1 for Source 4 Adjust the positions of CURSOR 1 and CURSOR 2 according to the measured wave form with the cycle and frequency of Cursor 1 and Cursor 2 displayed in the increment window The current position of Cursor 1 is displayed in the Cursor 1 window and that of Cursor 2 is displayed in the Cursor 2 window see Fig 52 Trig d M Pos 0 000ns CURS MEAS
29. ent Temperature Working temperature 0 to 40 C Storage temperature 20 to 60 C Relative Humidity lt 90 Height Operating 3 000 m Non operating 15 000 m Cooling Method Natural convection Mechanical Specifications Dimension 350mmx 157mmx120mm Weight 1 kilogram without battery option Interval Period of Adjustment One year is recommended for the calibration interval period 78 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 Users manual Options DS25 BATT Lithium battery Appendix C Maintenance Cleaning and Repair General Maintenance Please don t store or put the instrument in the place where the liquid crystal display will be directly exposed to the sunlight for a long time Caution The instrument or probe should not be stained with the spraying agent liquid and solvent to avoid any damage to it Cleaning Check the probe and instrument regularly according to their operating state Clean the external surface of the instrument following the steps shown as below 1 Please wipe the dust from the instrument and probe surface with a soft cloth Do not make any scuffing on the transparent LCD protection screen when clean the LCD screen 2 Clean the instrument with a wet soft cloth not dripping wate
30. er s manual so that this product can be erected correctly keeping it under a good ventilation condition Do not operate in a moist environment Do not operate in an explosive environment Keep the product s surface clean and dry DS25 Colour Digital Storage Oscilloscope User Manual Safety Terms and Symbols Terms in this manual The following terms may appear in this manual AN Warning A warning statement indicates the conditions and actions which may endanger the life safety A damage to this product or other property Note A note statement indicates the conditions and actions which may cause Terms on the product The following terms may appear on this product Danger It indicates that there may be an immediate injury to you when you encounter this mark Warning It indicates that there may not be an immediate injury to you when you encounter this mark Note It indicates that there may be damage to this product or other property Symbols on the products The following symbol may appear on the products A A mh High Voltage Please Consult the Manual Protective Ground End Grounding End for Measurement Earth End on the Shell 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
31. gger state Trig d The oscilloscope has already detected a trigger signal and is collecting the after triggering information Ready All pre triggered data have been captured and the oscilloscope has been already ready for accepting a trigger Scan The oscilloscope captures and displays the waveform data continuously in the scan mode Stop The oscilloscope has already stopped the waveform data acquisition 2 Waveform Viewing Area 3 The purple pointer indicates the horizontal trigger position which can be adjusted by the horizontal position control knob 4 The reading shows the time deviation between the horizontal trigger position and the screen centre line which equals 0 in the screen center 5 This reading shows the time deviation between the horizontal trigger position and the window centre line which is regarded as 0 in the window center 6 It indicates the current function menu 13 DS25 Colour Digital Storage Oscilloscope User Manual 10 11 12 13 14 15 16 17 18 19 20 21 22 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 The reading shows the trigger source It shows the selected trigger type I Rising edge triggering Falling edge triggering aN Video line synchronous triggering wil video field synchronous tr
32. h the oscilloscope turning on the signals of the two channels and displaying them in the screen 5 Adjust the VOLTS DIV knob making the amplitudes of two signals equal in the rough 69 DS25 Colour Digital Storage Oscilloscope User Manual 6 Push down the DISPLAY button and recall the DISP SET menu 7 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 8 Adjust the VOLTS DIV and VERTICAL POSITION knobs optimizing the wave form 9 With the elliptical oscillogram method adopted observe and calculate the phase difference see Fig 58 The signal must be centered and kept in the horizontal direction Fig 58 Lissajous Graph Based on the expression sing A B or C D where q is the phase difference angle and the definitions of A B C and D are shown as the graph above As a result the phase difference angle can be obtained namely q arcsin A B or arcsin C D If the principal axis of the ellipse is in the I and III quadrants the determined phase difference angel should be in the I and IV quadrants that is in the range of 0 x 2 or 3x 2 2n If the principal axis of the ellipse is in the II and IV quadrants the determined phase difference angle is in the II and III quadrants that is within the range of 7 2 7 or n 37 2 70 DS25 Col
33. iggering The reading shows the window time base set value The reading shows the main time base set value The two yellow dotted lines indicate the size of the viewing expanded window The icon shows the coupling mode of the CH2 channel indicates the direct current coupling indicates the AC coupling The reading shows the vertical scale factor the Voltage Division of the CH2 channel The icon indicates the coupling mode of the CH1 channel The icon indicates the direct current coupling NA The icon indicates the AC coupling The reading indicates the vertical scale factor the Voltage Division of the CHI channel The information shows the zero point positions of CH1 or CH2 channel The yellow pointer shows the grounding datum point zero point position of the waveform of the CH2 channel If the pointer is not displayed it shows that this channel is not opened The red pointer indicates the grounding datum point zero point position of the waveform of the CHI channel If the pointer is not displayed it shows that the channel is not opened The positions of two purple dotted line cursors measurements 14 DS25 Colour Digital Storage Oscilloscope User Manual How to Carry on the General Inspection After you receive a new DS series oscilloscope it is recommended that you should make a check of the instrument according to the following steps 1 Check whether there is any damage cause
34. igher sensitivity 2 Change the Vertical Setting and Observe the Consequent State Information Change With the information displayed in the status bar at the bottom of the waveform window you can determine any changes in the channel vertical scale factor Rotate the vertical VOLTS DIV knob and change the Vertical Scale Factor Voltage Division it can be found that the scale factor of the channel corresponding to the status bar has been changed accordingly Press buttons of CH1 MENU CH2 MENU and MATH MENU the operation menu symbols wave forms and scale factor status information of the corresponding channel will be displayed in the screen 22 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 POSITION b ORITONT L Hinu Fig 12 Horizontal Control Zone 1 Use the horizontal SEC DIV knob to change the horizontal time base setting and observe the consequent status information change Rotate the horizontal SEC DIV knob to change the horizontal time base and it can be found that the Horizontal Time Base display in the status bar changes accordingly The horizontal scanning speed steps from 5ns up to 5s in the sequence of 1 2 5 2 Use the HORIZONTA
35. ion button and select ON in the Inverted The wave form inverted function is initiated 3 Press the F4 menu selection button again and select OFF for Inverted item The function of wave form inverted is closed off For the screen display see Fig 18 and Fig 19 30 DS25 Colour Digital Storage Oscilloscope User Manual Irig 0 M Pos 0 000ns CH1 SETUP Coupling DC Channel ON Probe 1X Lnverted CH1 2 00u CHZ 50 0mu M 200us CHI 2 48v Fig 18 Wave Form not Inverted Irig d M Pos 0 000ns CH1 SETUP Coupling DC Channel ON Probe 1X Lnverted CH1 2 00u CH2 50 0mu M 2Z00us CH1 2 480 Fig 19 Wave Form Inverted 31 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 1 Press the MATH MENU button and call out the WAVE MATH menu 2 Press the F3 menu selection button and choose CH1 CH2 The green calculated wave form M is displayed in the screen press the F3 menu selection button again the wave form M is closed off see Fig 20 maismaa Irig d M Pos 0 000ns WAVE MATH CH1 CH2 ae VN HAL EB OY CH2 CH1 PST Men p cnp gg pede pete EEE a rais 238 i
36. l DS25 Colour Digital Storage Oscilloscope User Manual A D Converter Resolution of 8 bits with the sampling carried out in two channels at the same time Sensitivity Volt division Range V div 5mV div 5V div at the input BNC Displacement Range 10div 5mV 5V Simulative Bandwidth 25MHz Single Bandwidth Full Bandwidth Low frequency respond AC Saale gt P gt 5Hz at BNC Rising Time Typical at lt 17 5ns BNC DC Gain Accuracy 5 DC Measuring Accuracy Average for ACQU MODE The voltage difference AV between any two points on the wave form after averaging the captured wave forms of more than 16 5 Reading 0 05 divisions 76 DS25 Colour Digital Storage Oscilloscope User Manual Trigger Trigger Sensitivity DC Coupling Channel 1 and Channel 2 1div DC to Full Edge Trigger Bandwidth EXT 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 Trigger Level Range Internal 6 divisions from the screen center EXT 600mV EXT 5 3V Trigger Level Inside 0 3 div Accuracy Typical It EXT 40mV 6 of Set Value is applicable to the EXT 5 200mV 6 of Set Value signal with the rising and falling time gt 20ns Trigger Displacement Preliminary Trigger 655 divisions Post Trigger 4 divisions
37. lad to repair your oscilloscope as per our General Terms Of Assembly And Service DS25 Colour Digital Storage Oscilloscope User Manual Table of Contents General Safety Requirements Safety Terms and Symbols General Characteristics of the DS25 Colour Digital Storage Oscilloscope Junior User s Guidebook Introduction to the Front Panel and the User s Interface of the DS series Oscilloscope __ How to Carry out the General Inspection How to Carry out the Function Inspection How to Implement Probe Compensation How to Set the Probe Attenuation Coefficient How to Use the Probe Safely How to Implement Auto calibration Introduction to the Vertical System Introduction to the Horizontal System Introduction to the Trigger System Advanced User s Guidebook How to Set the Vertical System Implementation of Mathematical Manipulation Function Application of VERTICAL POSITION and VOLTS DIV Knobs How to Set the Horizontal system Main Time Base Window Setting Window Expansion How to Set the Trigger System Trigger Control Edge Trigger Video Trigger How to Operate the Function Menu How to Implement Sampling Setup How to Set the Display System 9 10 11 15 16 18 19 20 21 22 23 24 25 26 32 33 34 35 36 37 38 39 39 42 45 45 48 DS25 Colour Digital Storage Oscilloscope User Manual Persist XY Format 50 50 How to Save and Recall a Wave Form Save and Recall the Wave Form How to Carr
38. menu selection button to call out the function Recall Factory The default attenuation coefficient set value of the probe in the menu is 10X shown as Fig 4 Press any key enter system Fig 4 Power on the Instrument 2 Set the Switch in the Oscilloscope Probe as 10X and Connect the Oscilloscope with CH1 Channel Align the slot in the probe with the plug in the CH1 connector BNC and then tighten the probe with rotating it to the right side Connect the probe tip and the ground clamp to the connector of the probe compensator shown as Fig 5 16 DS25 Colour Digital Storage Oscilloscope User Manual Probe comp CHI 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 Trig d M Pos 0 000ns TRIG MODE Type Edge Slope Rising Source CH1 Mode Auto Coupling DC CH1 2 00u CHZ 50 0mu M 500us CH1 2 48v Fig 6 Autoset Check CH2 by repeating Step 2 and Step 3 17 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 For adjusting the probe compensation ple
39. n button again and choose Type ao wee YS ES Press the F2 menu selection button and choose Pk Pk 64 DS25 Colour Digital Storage Oscilloscope User Manual 8 Press the F3 menu selection button and choose Pk Pk 10 Read the peak to peak values of Channel I and Channel 2 from the displayed menu see Fig 54 11 Calculate the amplifier gain with the following formulas Gain Output Signal Input signal Gain db 20xlog gain Trio d M Pos 0 000ns MEASURE Source Type 0 000mu CH2 PK PK 52 00u CH1 Zu CHZ 20u M 500us 7 CH1 0 00my Fig 54 Wave Form of Gain Measurement Example 3 Capture the Single Signal The digital storage oscilloscope takes the lead in providing the convenience capturing of such non periodic signals as pulse and burr etc If you intent to capture a single signal you can not set the trigger level and the trigger edge unless you have a particular priori knowledge of this signal For example if the pulse is the logic signal of a TTL level the trigger level should be set to 2 volts and the trigger edge be set as the rising edge trigger If it is uncertain as to the signal you can make an observation 65 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 1 RE EN SR a Set the probe menu attenuation coefficient
40. nel Vertical Show the vertical parameter of the channel Trigger Show the parameters of the trigger system Misc Adjust the Date and Time After entering into the SYS STAT menu choose the corresponding function with the corresponding parameters shown in the screen If press the Fl menu selection button and choose the function item Horizontal the Horizontal System State will be displayed in the screen Press any other function button and exit from the SYS STAT menu see Fig 47 Trig M Pos 0 000ns SYS STAT HORIZONTAL SYSTEM STATUS TIME BASE MAIN TIME BASE MAIN SCALE 500us WINDOW SCALE 25 us ere MAIN POSITION 0 000ns USER WINDOW POSITION Os DISPLAY FORMAT YT ACQUIRE MODE SAMPLE Trigger Misc CH1 20v CHZ 50 0mu M 500us CH1 0 00nu Fig 47 Horizontal System State 56 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 The menu is displayed as Fig 48 MEASURI Fig 48 Measure Menu Measure Four automatic measured values can be shown one time at maximum for the wave form of each ch
41. nu The description of the Auxiliary Function Menu is shown as the following table Function Menu Setting Description System Status Display the system function menu Recall Factory Call out the factory settings Do Self Cal Carry out the self calibration procedure Language Chinese Choose the display language of the ENGLISH operating system 54 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 Before executing the self calibration procedure disconnect the probe or wire and the input connector Then press the F3 menu selection button and choose Do Self Cal After confirming it is all set push down F3 button and choose Do Self Cal entering the self calibration procedure of the instrument SYS STAT System State Press the F1 menu selection button and choose SYS STAT item The menu pops up in the screen as Fig 46 Fig 46 SYS STAT Menu 55 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 chan
42. o be familiar with the use of the DS series oscilloscope in the shortest time The DS series oscilloscope offers a simple front panel with distinct functions for completing basic operations in which the knobs and function pushbuttons are included The knobs have the functions similar to other oscilloscopes The 5 buttons in the column on the right side of the display screen are menu selection buttons defined as F1 to F5 from top to bottom respectively through which you can set the different options for the current menu The other pushbuttons are function buttons through which you can enter different function menus or obtain a specific function application directly 11 DS25 Colour Digital Storage Oscilloscope User Manual Fig 1 The Front Panel of a DS series Oscilloscope Function Buttons Rube TOP POSITION LEVEL POLDOFF TRIO HE KU ST TO sn FORCE TRIG TR MEW MAX TV ee Back light Adjustment Vertical Control Connector Horizontal Trigger Control Control Menu Selection Fig 2 Explanatory Drawing for Operation of the DS series Oscilloscope DS25 Colour Digital Storage Oscilloscope User Manual 3 4 5 6 SECUN s 0 000ns U 0 000n Fig 3 Illustrative Drawing of Display Interfaces 1 The Trigger State indicates the following information Auto The oscilloscope is under the Automatic mode and is collecting the waveform under the non tri
43. our 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 1 2 3 4 5 6 Press the TRIG MENU button to display 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 Press the F3 menu selection button and choose CH1 for Source Press the F4 menu selection button and choose Field for Sync Adjust the VOLTS DIV VERTICAL POSITION and SEC DIV knobs to obtain a proper wave form display see Fig 59 mig d M Pos 280 0us TRIG MODE Type Video Polarity Normal Source CH1 Sync CH1 5v CH2 20v M 200us CH1 All CH1 0 72divs 3 60v Fig 59 Wave Form Obtained from Video Field Trigger Video Line Trigger For the trigger in the video line please operate according to the following steps 71 DS25 Colour Digital Storage Oscilloscope User Manual NSR 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 Press the F4 menu selection button and choose Line for Sync Adjust the VOLT
44. r during the period of which please pay attention to the disconnection of power It is recommended to scrub with soft detergent or fresh water Please don t apply any corrosive chemical cleaning agent to prevent the instrument or probe from damage esse Before power on again for operation it is required to confirm that the instrument has already been dried completely avoiding any electrical short circuit or bodily injury resulting form the moisture 79
45. s oscilloscope 25 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 Setting of CH1 and CH2 Every channel has an independent vertical menu and each item is set respectively based on the channel With the CH1 MENU or CH2 MENU menu button pushed down the system shows the operation menu of the corresponding channel see Fig 14 Fig 14 Channel Setting Menu 26 DS25 Colour Digital Storage Oscilloscope User Manual The description of the Channel Menu is shown in the following list 1 Function Menu Setting Description Coupling AC Block the AC component in the input signal DC Unblock the AC and DC components in the input signal Channel OFF Close the measurement channel ON Open the measuring channel Probe 1X Choose one according to the probe attenuation factor to make the vertical scale 10X reading accurate 100X 1000X Inverted OFF The wave form is displayed normally ON Initiate the wave form inverted function Setting Channel Coupling Taking the Channel 1 for example the measured signal is a square wave signal containing the direct current bias The operation steps are shown as below 1 Press the CH1 MENU button and call out the CH1 SETUP menu
46. se the wave form to be saved CH2 MATH WAVE A B Choose the address in or from which the C D waveform is saved or can be get access to Save Save the wave form of the source in the selected address CHA OFF Switch on or off the display of the stored ON wave form 52 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 In order to save the wave form of the channel CH1 into the address A the operation steps should be followed 1 2 3 4 Press the F1 menu selection button and choose CH1 for Source Press the F2 menu selection button and choose A for Wave Press the F3 menu selection button and save the wave form Press the F4 menu selection button and choose ON for CHA The stored wave form A will be displayed in the screen The voltage level and time base level will also be shown at the upper left corner of the display area at the same time see Fig 43 Irig d M Pos 0 000ns WAVE SAVE Sourec CH1 CH1 20v CHZ 50 Onu M 500us 7 CH1 0 00mu CH1 1 60 divs 32 00v Fig 43 Wave Saving 53 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 Me
47. t function menu CURS MEAS in the screen which Measurement shown as Fig 50 includes Voltage Measurement and Time Fig 50 CURS MEAS Menu The description of the cursor measurement menu is shown as the following table Function Menu Setting Description Type OFF Voltage Time Switch off the cursor measurement Display the voltage measurement cursor and menu Show time measures the cursor and menu Source CH1 CH2 Choose the channel generating the wave form to which the cursor measurement will be applied Delta Read the difference between cursors Cursor 1 Read the position of Cursor 1 the Time is read with reference to the horizontal trigger position and the Voltage is to the ground point Cursor 2 Read the position of Cursor 1 the Time is read with reference to the horizontal trigger position and the Voltage is to the ground point 59 DS25 Colour Digital Storage Oscilloscope User Manual Cursor Measurement When carrying out the cursor measurement the position of Cursor I 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 Perform the following operation steps for the voltage cursor measurement of the channel CH1 1 Press CURSOR and recall the Curs Meas menu 2 Press the F1 menu selection button to choose Voltage for Typ
48. the un triggered sample mode the data are displayed as bright spots and the sampling rate is IMS s and can not be changed The operations of all control knobs are as follows m The Vertical VOLTS DIV and the Vertical POSITION knobs of Channel 1 are used to set the horizontal scale and position B The Vertical VOLTS DIV and the Vertical POSITION knobs of Channel 2 are used to set the vertical scale and position continuously 50 DS25 Colour Digital Storage Oscilloscope User Manual The following functions can not work in the XY Format M Reference or digital wave form B Cursor B Auto Set B Time base control B Trigger control Operation steps 1 Press the DISPLAY button and call out the Display Set Menu 2 Press the F3 menu selection button and choose the form as XY The display format is changed to be XY mode see Fig 41 Irig d M Pos 0 000ns DISP SET Type Vectors Persist Infinite Format lx Y Carry Bitmap CH1 10u CHZ 1 00u M 500ns CHZ 80 0mu Fig 41 XY Display Mode 51 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 Fig 42 Wave Form Save Menu The description of the Wave Form Save Menu is shown as the following table Function Menu Setting Description Source CH1 Choo
49. tion switch setting 10X and the DS series digital oscilloscope Only if the oscilloscope fulfills the following two conditions at first can these specification standards be reached M This instrument should run for more than 30 minutes continuously under the specified operating temperature W If the change range of the operating temperature is up to or exceeds 5C open the system function menu and execute the Auto calibration procedure All specification standards can be fulfilled except the one s marked with the word Typical Sampling ACQU Mode Sample Peak Detection Average Sampling Rate 100 MS s Input Input Coupling DC AC Input Impedance IMQ 2 connected with 20pF 3pF in parallel Probe attenuation coefficient 1X 10X 100X 1000X Max Input Voltage 300V Peak Value Level Sampling Rate Range 10S s to 100MS s Waveform interpolation sinx x Record Length 6000 sampling points per channel Scanning Speed Range 5ns div to 5s div according to the stepping mode of S div 1 2 5 5 Accuracy of Sampling Rate 100ppm for any time interval equal to or greater and Delay Time than 1ms Measuring Accuracy of Time Single One Sampling Interval Time 100ppm x Interval AT Full Reading 0 6ns Bandwidth gt Averages of 16 One Sampling Interval Time 100ppmx Reading 0 4ns 74 DS25 Colour Digital Storage Oscilloscope User Manual 75 Vertica
50. tory Make sure that the set value of the attenuation switch in the T5100 probe is the same as the menu selection of the probe in the oscilloscope The set values of the probe switch are 1X and 10X see Fig 9 RL N Ka Fig 9 Attenuation Switch IN Note When the attenuation switch is set to 1X the T5100 probe will limit the bandwidth of the oscilloscope in 5MHz If it is needed to use the whole bandwidth of the oscilloscope the switch must be set to 10X 19 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 A 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 In order to protect you from suffering an electric shock during your use of the probe do not touch the metal part of the probe tip when the probe is connected to the signal source Before making any measurements please connect the probe to the instrument and connect the ground terminal to the earth 20 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 r
51. tton to force a trigger signal which is mainly applied to the Normal and Single trigger modes 5 The TRIG VIEW button is used to reset the trigger horizontal position 24 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 Based on the introduction of the previous Chapter the user should have an intimate knowledge of the determination of the change of the oscilloscope setting through observing the status bar If you have not been familiar with the above mentioned operations and methods yet we advise you to read the section of Chapter One Junior Users Guidebook This chapter will deal with the following topics mainly How to Set the Vertical System How to Set the Horizontal System How to Set the Trigger System How to Carry on the Sampling Setup How to Set the Display System How to Implement the Storage and Call out Operations How to Carry out the Auxiliary Function Setting How to Carry out the Automatic Measurement How to Carry out the Cursor Measurement How to Use Executive Buttons It is recommended that you read this chapter carefully to get acquainted with the various measurement functions and other operating methods of the DS serie
52. u 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 Mig d M Pos 0 000ns DISP SET Persist OFF Format YT Carry Bitmap CH1 2 00u CHZ 20 0mu M 200us Ne CH1 640nu Fig 38 Display in the Vector Form Irig d M Pos 0 000ns DISP SET Type Persist OFF Format YTI Carry Bitmap CH1 2 00u CHZ 20 Omu M 200us No CH1 640mu Fig 39 Display in Dots form 49 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 Isec 2sec 5sec Infinite and Closed When the Infinite option is set for Persist time the measuring points will be stored until the controlling value is changed see Fig 40 Irig d M Pos 0 000ns DISP SET Type Vectors Persist Format Carry Bitmap CH1 500mu CHZ 20 0mu M 500us m CH1 All Fig 40 Infinite Persistence Display XY Format This format is only applicable to Channel 1 and Channel 2 After the XY display format is selected Channel 1 is displayed in the horizontal axis and Channel 2 in the vertical axis the oscilloscope is set in
53. value Check whether the channel attenuation coefficient conforms with the attenuation ration of the probe used in practical application 4 There is wave form displayed but it is not stable Check whether the Source item in the TRIG MODE menu is in conformity with the signal channel used in the practical application Check on the trigger Type item The common signal chooses the Edge trigger mode for Type and the video signal the Video Only if a proper trigger mode is applied the wave form can be displayed steadily Try to change the trigger coupling into the high frequency suppress and the low frequency suppress to smooth the high frequency or low frequency noise triggered by the interference 5 No Display Responses to the Push down of RUN STOP Check whether Normal or Signal is chosen for Polarity in the TRIG MODE menu and the trigger level exceeds the wave form range If it is make the trigger level is centered in the screen or set the trigger mode as Auto In addition with the AUTOSET button pressed the setting above can be completed 73 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 Appendix A Technical Specifications Unless otherwise specified the technical specifications applied are applicable to the probe with the attenua
54. y out the Auxiliary System Function Setting Do Self Cal Self Calibration SYS STAT System State How to Conduct Automatic Measurement Measure How to Carry out Cursor Measurement Cursor Measurement How to Use Executive Buttons AUTOSET Examples of Application Example 1 Measurement of Simple Signals Example 2 Gain of the Amplifier in the Metering Circuit Example 3 Capture a Single Signal Example 4 Analyze the Details of a Signal Example 5 Application of X Y Function Example 6 Video Signal Trigger Fault Treatment Appendix A Technical Specifications Appendix B Enclosure Appendix C Maintenance Cleaning and Repair 52 53 54 55 55 57 57 59 60 62 62 63 63 64 65 67 69 71 73 74 79 79 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 Only qualified technicians should implement maintenance procedures Prevention of Fire or Bodily Injury Use the correct power line Only use the power cord specially provided for this product or one which has been approved Connect or Disconnect Correctly When the probe or testing wire is connected to the power lead please do not connect and disconnect the
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