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Example 2: View a signal delay caused by a circuit

This example is to test the input and output signals of a circuit and observe the
signal delay. First, set the probe and the channel attenuation to 10X and connect
CH1 probe to the input, CH2 to the output of the circuit.

Do these steps as follow:

1. Display the signals (CH1 and CH2):

1) Pressing the AUTO button
2) Adjust the vertical and the horizontal scale by turning the SCALE knobs to

appropriate ranges for display.

3) Press the CH1 button to select CH1, and turn the vertical POSITION knob to

adjust the vertical position of CH1’s waveform.

4) Press the CH2 button to select CH2, and turn the vertical POSITION knob to

adjust the vertical position of CH2’s waveform.

．

Measure the delay time when a signal going through the circuit

Auto-measuring the delay:
Press MEASURE

→

Source

→

CH1

to set measurement source

Press Time

to select measurement Type

Press Time3/3 to select measurement page.
Press Delay1

→

2 to display the result on the screen.

Figure 3-1: Delay of the signals

3-2

User Manual for DS5000 Series

Содержание DS 5000C

Страница 1: ...User Manual RIGOL Publication number DS5 040501 May 2004 DS 5000 Series Digital Storage Oscilloscope DS 5000CA DS 5000C DS 5000MA DS 5000M Copyright Rigol Electronic Co Ltd 2004 All Rights Reserved...

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Страница 3: ...a and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specification and price change privileges reserved NOTE RIGOL is registere...

Страница 4: ...y grounded Connect the probe properly The probe ground lead is at ground potential Do not connect the ground lead to an elevated voltage Observe All Terminal Ratings To avoid fire or shock hazard obse...

Страница 5: ...product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazar...

Страница 6: ...5062MA DS5062M 40 MHz DS5042M 25 MHz DS5022M 4K Channel Memory Depth Mono Color LCD Display 320 240 resolution Real time Sample Rate 1GSa s DS5000CA series DS5000MAseries 250MSa s DS5000C series DS500...

Страница 7: ...ries already included in the package Two 1 5 meter 1 1 and 10 1 probes Power cable for country of destination User Manual Warranty and Registration Form Options available EM5 CM Communications functio...

Страница 8: ...et Up the Sampling System 2 33 How to Set Up the Display System 2 37 How to Store and Recall Waveforms or Setups 2 39 How to Set Up the Utility 2 41 How to Measure Automatically 2 51 How to measure wi...

Страница 9: ...ages 4 1 T oubleshooting 4 3 CHAPTER 5 SUPPORT SERVICE 5 1 CHAPTER 6 REFERENCE 6 1 Appendix A Specifications 6 1 Appendix B DS5000 Series Accessories 6 6 Appendix C General Care and Cleaning 6 7 Index...

Страница 10: ......

Страница 11: ...ont panel and user interface To inspect the instrument To take a functional check To compensate probes To display a signal automatically To set up the vertical window To set up the horizontal system T...

Страница 12: ...nd menus associated with channels math and reference or instant action features Figuer1 1 DS 5000 Series Oscilloscope s Front Panel DS5000 series oscilloscopes provide an easy to use front panel the d...

Страница 13: ...Trigger control Horizontal control Vertical control ProbeCompensator EXT trigger input Figure 1 2 Front Panel Controls Throughout this book a box around the name of the key denotes the front panel key...

Страница 14: ...s CH1 status CH2 status Timebase status The position of current window in memory Trigger p in memory osition Trigger position in current window Waveform display Trigger position Figure 1 3 User Interf...

Страница 15: ...ssories available in the front of this manual If the contents are incomplete or damaged notify your RIGOL sales office 3 Inspect the instrument If there is mechanical damage or defect or if the instru...

Страница 16: ...e top menu box and push the Factory menu box STORAGE ON OFF Figure 1 4 WARNNING To avoid electric shock be sure the oscilloscope is properly grounded 2 Input a signal to a channel of the oscilloscope...

Страница 17: ...hen 50 input impedance is selected Probe comp Figure 1 6 Set the probe attenuation to 10X To do this push CH1 Probe 10X Figure 1 7 Probe attenuation Push the AUTO button Within a few seconds you could...

Страница 18: ...nd the reference lead to the PROBE COMP Ground connector turn on channel 1 and then press AUTO 2 Check the shape of the displayed waveform Overcompensated Correctly Compensated Under Compensated Figur...

Страница 19: ...sed on the trigger source The trigger source selected is the lowest numbered input that has a signal applied The DS5000 series are two channel oscilloscopes with an external trigger input In this exer...

Страница 20: ...it is calibrated Notice that as you turn the POSITION knob a voltage value is displayed for a short time indicating how far the ground reference is located from the center of the screen Also notice t...

Страница 21: ...f the soft buttons and notice which button cause the status bar to change Channels 1 and 2 have a venire soft button that allows the SCALE knob to change the vertical step size in smaller increments T...

Страница 22: ...splayed in the status bar The time base ranges of the DS5000 series are listed as follows From 1 ns div to 50 s div and they can reach 10ps div in Delayed Scan mode NOTE This characteristic varies by...

Страница 23: ...ormat and set the horizontal POSITION knob to Trig Offset or Holdoff mode Horizontal position control Trig Offset In this setting the trigger s position will be changed horizontally when you turn the...

Страница 24: ...lloscopes as you turn the LEVEL knob or press the 50 menu button for a short time two things happen on the display First the trigger level value is displayed at the bottom left of the screen If the tr...

Страница 25: ...ect trigger source choices Press the trigger Mode button to select these three trigger mode choices Set the Coupling and notice that they affect the waveform display differently NOTE The trigger type...

Страница 26: ......

Страница 27: ...on hints by reading this guide We recommend you perform all of the following exercises so you become familiar with the powerful measurement capabilities of the oscilloscope This chapter covers the fol...

Страница 28: ...to reduce display noise To set OFF will get full bandwidth Probe 1X 10X 100X 1000X Set this to match your probe attenuation factor to make the vertical scale readout correct Digital filter Setup digit...

Страница 29: ...he DC component of the input signal The waveform is displayed as Figure 2 1 Set to AC Coupling Figure 2 1 AC status Press CH1 Coupling DC to set CH1 s coupling as DC In this setting it passes both AC...

Страница 30: ...GND to set CH1 s coupling as GND In this setting it disconnects the input signal The screen displays as Figure 2 3 Copyright 2004 Rigol Electronic 2 4 Set to GND Coupling Figure 2 3 GND status User M...

Страница 31: ...ponent in the signal and the oscilloscope is set to full bandwidth The waveform is displayed as Figure 2 4 Set off bandwidth Figure 2 4 Press CH1 BW Limit ON to set up bandwidth limit to ON status It...

Страница 32: ...s the CH1 or CH2 button according to which channel you are using toggle the Probe soft button to change the attenuation factor to match the probe you are using This setting remains in effect until cha...

Страница 33: ...high and low limit of frequency Figure 2 7 Set filter Off The waveform before filtered Set filter ON Figure 2 8 The waveform after filtered Table2 3 Copyright 2004 Rigol Electronic 2 7 Menu Settings...

Страница 34: ...arse It is the default setting of Volts Div and it makes the vertical scaling in a 1 2 5 step sequence from 2mV div 5mV div 10mV to 5 V div Fine This setting changes the vertical scale to small steps...

Страница 35: ...he inverted signal the trigger is also inverted Push the CH1 or CH2 button and then press the Invert button to invert the waveform on this activated channel Figure 2 10 and 2 11 show the changes after...

Страница 36: ...age at BNC does NOT exceed the maximum voltage 5Vrms to avoid damaging channel input components Do not use 50 with the standard probe Figure 2 12 1M Impedance Table2 4 50 Models Provided DC5202CA DS51...

Страница 37: ...om 0 1 to 1000 such as0 1 0 2 0 5 1000 The scale will be displayed on the status bar Figure 2 13 MATH scale Table2 5 Menu Settings Comments Operation A B A B A B A B FFT Add source A to source B Subtr...

Страница 38: ...ndow Rectangle Hanning Hamming Blackman Select window for FFT Display Split Full screen Display FFT waveform on half screen Display FFT waveform on full screen Scale Vrms dBVrms Set Vrms as vertical u...

Страница 39: ...frequency poorer magnitude accuracy than Rectangular Hamming has slightly better frequency resolution than Hanning Sine periodic and narrow band random noise Transients or bursts where the signal lev...

Страница 40: ...nonvolatile memory Press REF button to display reference waveform menu Table2 8 Menu Settings Comments Source CH1 CH2 Select channel for REF Save Select reserved waveform as resource of REF Invert ON...

Страница 41: ...ou want 3 Revolving vertical position and vertical scale to change positions 4 Press save to save the currently displayed waveform as REF NOTE 1 The reference function is not available in X Y mode 2 Y...

Страница 42: ...OFF button to remove the selected waveform from the screen Table2 9 Symbol Channel Status DS5000M DS5000C Channel 1 CH1 Selected ON OFF No status symbol No status symbol Channel 2 CH2 Selected ON OFF...

Страница 43: ...changed The waveform display will contract or expand about the ground level If the Volts Div is set to Coarse the waveform scales in a 1 2 5 step sequence from 2 mV to 5 V If the Volts Div is set to F...

Страница 44: ...ION The horizontal POSITION knob adjusts the horizontal position of all channels and math or REF waveforms The resolution of this control varies with the time base The oscilloscope digitizes waveforms...

Страница 45: ...vertical voltage and horizontal time Show CH1 value at X axis CH2 value at Y axis Trig offset Holdoff Adjust horizontal position in memory Adjust Holdoff time Trig offset Reset Adjust to the center Ho...

Страница 46: ...on the vertical axis as it varies over time on the horizontal axis X Y XY format displays channel 1 in the horizontal axis and channel 2 in the vertical axis Time Div Horizontal scale If the waveform...

Страница 47: ...n 1 Connect a signal to the oscilloscope and obtain a stable display 2 Press horizontal MENU Delayed ON or press horizontal SCALE knob to enter Delayed Scan mode The screen is divided into two parts T...

Страница 48: ...st turn off the Delayed Scan mode Since both the main and Delayed Scan are displayed there are half as many vertical divisions so the vertical scaling is doubled Notice the changes in the status bar D...

Страница 49: ...he oscilloscope uses the untriggered sample acquisition mode and data displays as dots The sampling rate can vary from 4 KS s to 100 MS s and the default sampling rate is 1 MS s Figure 2 17 X Y displa...

Страница 50: ...ds Trigger Positiion Holdoff Holdoff Time Figure 2 18 Trigger Holdoff To use trigger Holdoff 1 Push TIME display time base menu 2 Push 3rd function key select trigger Holdoff function 3 Adjust horizon...

Страница 51: ...fter it detects a trigger the oscilloscope continues to acquire enough data so that it can draw the waveform to the right of the trigger point The trigger control area on the front panel includes a kn...

Страница 52: ...ss the trigger slope control press the MENU button select Edge and use the Slope button to select Rising or Falling Table 2 11 Menu Settings Comments Source CH1 CH2 EXT EXT 5 AC Line EXT 50 Selects CH...

Страница 53: ...iggers on the positive edge of the sync pulse All Lines Line Num Trigger on all lines Trigger on an appointed line Sync Odd field Even field Select to trigger on odd field or even field Standard PAL S...

Страница 54: ...igure 2 19 and 2 20 display the waveforms with Line and Field synchronization Figure 2 19 Line synchronization Copyright 2004 Rigol Electronic 2 28 Figure 2 20 Field synchronization User Manual for DS...

Страница 55: ...e width equal to Negative pulse width less than Negative pulse width larger than Negative pulse width equal to Setting Width Adjust pulse width Mode Auto Normal Single Acquire waveform even no trigger...

Страница 56: ...gnal by 5X which extends the trigger level range from 8 V to 8 V This allows the oscilloscope to trigger on a larger signal EXT 50 sets the input impedance to 50 It is normally used for high frequency...

Страница 57: ...e oscilloscope go to the rolling mode without trigger Normal The Normal mode allows the oscilloscope to acquire a waveform only when it is triggered If no trigger occurs the oscilloscope keeps waiting...

Страница 58: ...4div of pretrigger and 1s delayed trigger can be surveyed by adjusting the horizontal POSITION This feature is very useful because you can see the events that led up to the trigger point Everything to...

Страница 59: ...log Peak Detect Normal Acquisition mode Average Acquisition mode Analog Acquisition mode Peak Detect Acquisition mode Sampling Real Time Equal Time Realtime sampling mode Equivalent sampling mode Aver...

Страница 60: ...average sampling Copyright 2004 Rigol Electronic 2 34 Figure 2 25 Display signal after average sampling Note Select Real time acquisition to observe the single shot or pulse signals Select Equal Time...

Страница 61: ...ows you to see dynamic changes like adjusting a potentiometer on low frequency signals Two frequently used applications are transducer monitoring and power supply testing The oscilloscope is untrigger...

Страница 62: ...accuracy Reduces random or uncorrelated noise in the signal display The averaged waveform is a running average over a specified number of acquisitions from 2 to 256 Analog acquisition The oscilloscope...

Страница 63: ...Grid Display grids and coordinates on the screen Turn off the grids Turn off the grids and coordinates Press to increase display contrast Press to decrease display contrast Figer2 29 Table2 17 Menu S...

Страница 64: ...n is suitable for Real time sampling and will be more effective at 20ns or faster timabase Refresh rate It is an important performance of digital oscilloscopes It means times of oscilloscopes refreshi...

Страница 65: ...system Figure 2 31 Table 2 18 Menu Settings Comments Storage Waveforms Factory Setups Store or recall waveforms Recall factory setups Store or recall instrument setups Waveform No 1 No 2 No 3 No10 Se...

Страница 66: ...ault the oscilloscope saves the setup each time it is powered off The oscilloscope automatically recalls this setup the next time it is powered on Load The stored waveforms setups and factory setup ca...

Страница 67: ...omments I O settings Setup I O configuration Sound ON OFF Switch beeper sound on off Counter OFF ON Turn off Frequency Counter Turn on Frequency Counter Language Simplified Chinese Traditional Chinese...

Страница 68: ...ess This function is only available when EM5 CM or EM5 COM is attached to the instrument USB unconnected Figure 2 36 Table 2 22 Menu Settings Comments RS 232 Baud 300 38400 Set RS 232 baud rate as 300...

Страница 69: ...re changes by 5 C or more Before running this procedure do these steps 1 Disconnect any probes or cables from all channel inputs otherwise failure or damage to the oscilloscope may occur Copyright 200...

Страница 70: ...l test stopped press to run Pass fail test running press to stop Msg display On Off Turn on pass fail information display Turn off pass fail information display Figure 2 39 Table 2 24 Menu Settings Co...

Страница 71: ...eform 0 04div 4 00div Y Mask y div Set vertical clearance to the waveform 0 04div 4 00div Create Mask Create a test mask according to the above clearance Save Store created test mask NOTE Pass fail fu...

Страница 72: ...ord mode Select play back mode Select storage mode Turn off all recorder functions Source CH1 CH2 Select record source channel Interval 1 00ms 1000s Set time interval between record frames End Frames...

Страница 73: ...1 1000 Set End frame Note the RUN STOP button can also control playback run stop Storage Store recorded waveforms to non volatile memory according to setup frames Figure 2 44 Table2 29 Menu Settings C...

Страница 74: ...st Press this soft button to run Screen Test program Fellow the prompt message on the screen Press RUN Key to Continue the Test The screen of DS5000M series turns black or white in sequence Mono and t...

Страница 75: ...e blocks will reverse its color to red Color models or black Mono models when the corresponding key or knob get pressed and the color will keep reversed during the test 3 You could follow the promptin...

Страница 76: ...Language The DS5000 series oscilloscopes have multi language user menu choose as your desire Copyright 2004 Rigol Electronic 2 50 Press UTILITY Language to select the language User Manual for DS5000 S...

Страница 77: ...measurement including Vpp Vmax Vmin Vtop Vbase Vamp Vavg Vrms Overshoot Preshoot Freq Period Rise Time FallTime Delay1 2 Delay1 2 Width Width Duty Duty include 10 voltage and 10 time measurements Fig...

Страница 78: ...eform Vavg Measure average voltage of a waveform Page 2 for voltage measurements Figure 2 49 Table 2 33 Menu Settings Comments Voltage 2 3 Page 2 for voltage parameters measurements Vamp Measure volta...

Страница 79: ...shoot Measure preshoot in percentage of a square waveform Page 1 for time measurements Figure 2 51 Table 2 35 Menu Settings Comments Time 1 3 Page 1 for time parameters measurement Freq Measure Freque...

Страница 80: ...2 37 Copyright 2004 Rigol Electronic 2 54 Menu Settings Comments Time 3 3 Page 3 for time parameters measurement Delay1 2 Measure the signals delay between two channels at the rising edge Delay1 2 Me...

Страница 81: ...parameters pages by pressing soft button as follows MEASURE Voltage or time Voltage1 3 Voltage2 3 4 To gain the measured value on the screen You could select the parameters you are interested in by p...

Страница 82: ...voltage measured over the entire waveform Vmin The minimum amplitude The most negative peak voltage measured over the entire waveform Vamp Voltage between Vtop and Vbase of a waveform Vtop Voltage of...

Страница 83: ...at the leading edge of the first pulse in the waveform takes to rise from 10 to 90 of its amplitude Fall Time Time that the falling edge of the first pulse in the waveform takes to fall from 90 to 10...

Страница 84: ...k In this mode the screen displays two cross cursors The cross cursor sets the position on the waveform automatically You could adjust cursor s horizontal position on the waveform by turning the horiz...

Страница 85: ...e increment between the two cursors To do manual Cursor Measurements follow these steps 1 Select the Manual mode for cursor measurement by pressing soft button as CURSOR Mode Manual 2 Select channel S...

Страница 86: ...Voltage cursor centered around channel ground level Display Cursor 2 same as above Display horizontal space between cursor 1 and 2 X Time between cursors Display 1 X units in Hz kHz MHz GHz Display ve...

Страница 87: ...axis increment and its reciprocal between the cursors Increment Y Display the Y axis increment between the cursors You can switch the value display between X or Y bypressing the key beside this menu...

Страница 88: ...centered around the midpoint of screen Voltage cursor centered around channel ground level Display Cursor 2 same as above Display horizontal space between cursor 1 and 2 X Time between cursors Display...

Страница 89: ...ic measuring See the following figure Copyright 2004 Rigol Electronic 2 63 Figure 2 61 Auto Measure Mode of Cursor Measurement There will be no cursor display if no parameter were chosen in MEASURE me...

Страница 90: ...nts Multi cycle Press to display multi cycle waveform on the screen Single cycle Press to display single cycle waveform on the screen Rise edge Press to display the waveform s rising edge and measure...

Страница 91: ...Adjust to right position Trigger type Edge Trigger source Measure the channel with input signal automatically Trigger coupling DC Trigger voltage Midpoint setting Trigger mode Auto POS knob Trigger o...

Страница 92: ......

Страница 93: ...Automatic Measurements The oscilloscope could take automatic measurements on most signals To measure the frequency and peak to peak amplitude do these steps as follow 1 Measure peak to peak amplitude...

Страница 94: ...opriate ranges for display 3 Press the CH1 button to select CH1 and turn the vertical POSITION knob to adjust the vertical position of CH1 s waveform 4 Press the CH2 button to select CH2 and turn the...

Страница 95: ...trol area to display the menu Press Edge to select trigger mode Press Slope to select Rising Press Source to select CH1 Press Mode to select Single Press Coupling to select DC Turn the vertical and ho...

Страница 96: ...ain a stable display 2 Remove the noise from the trigger path by turning on HF Reject HF Reject High frequency reject adds a low pass filter with the 3 dB point at 150 kHz Use HF reject to remove high...

Страница 97: ...iminates the noise from the displayed waveform The higher the number of averages is the more noise that is removed from the display However the higher number of averages the slower the displayed wavef...

Страница 98: ...re the ring frequency at the rising edge of a signal do these steps 1 Press CURSOR key to see the Cursor menu 2 Press Mode to set Manual mode 3 Press Type to select Time measurement 4 Rotate vertical...

Страница 99: ...POSITION knob to place cursor A on the top of the first positive peak of the ring 5 Rotate horizontal POSITION knob to place cursor B on the bottom of the first negative peak of the ring You can see...

Страница 100: ...output 3 If the channels are not displayed press the CH1 and CH2 buttons 4 Press the AUTO button 5 Adjust the vertical SCALE knob to display approximately the same amplitude signals on each channel 6...

Страница 101: ...two signals From the formula above you could get arcsine A B or arcsine C D If the main axis of the ellipse is at I and III quadrant must be in the range of 0 2 or 3 2 2 If the main axis is at I and I...

Страница 102: ...elds do these steps 1 Press the MENU key in the Trigger control area to see the Trigger menu 2 Press Mode to select Video mode 3 Press Source to select CH1 as trigger source 4 Press Polarity to select...

Страница 103: ...select Video mode 3 Press Source to select CH1 as trigger source 4 Press Polarity to select 5 Press Sync to select Line Num 6 Turn LEVEL to trigger on a specified line number 7 Turn the horizontal SC...

Страница 104: ...Frequency measurement Hz Do these steps as follow 1 Press CURSOR key to display menu 2 Press Type to select Time or Voltage 3 Press Source to select FFT 4 Turn vertical and horizontal POSITION to a in...

Страница 105: ...tput module it could output fail pulse signals open collector output Do the steps as following 1 Press UTILITY key to show the UTILITY menu 2 Press Enable Test and select ON to open the test 3 Press L...

Страница 106: ......

Страница 107: ...ge for detecting while pressing the AUTO button No zoom at this Time Div Prompts that under some time bases or X Y mode the Delayed Scan function is not available Position at limit Prompts that the ch...

Страница 108: ...Volts Div at limit Prompts that the Volts Div is at full range while turning the vertical SCALE knob Delay scale at limit Prompts that it is at the full range of horizontal resolution under the Delaye...

Страница 109: ...than the value expected Check if the probe attenuation is the same as the channel attenuation 4 If the oscilloscope does not get a stable waveform display please check according to the following steps...

Страница 110: ...7 The signal is displayed as ladder like waveform The time base maybe is too slow You should turn the horizontal SCALE knob to increase horizontal resolution to improve the display Maybe the display...

Страница 111: ...of shipment from an authorized RIGOL distributor If a product or LCD proves defective within the respective period RIGOL will provide repair or replacement as described in the complete warranty statem...

Страница 112: ......

Страница 113: ...al Specifications Acquisition Sampling Modes Real Time Equivalent Sampling Rate 1GSa s DS5000CA DS5000MA 250MSa s DS5000C DS5000M 50GS s Averages N time acquisitions all channels simultaneously N is s...

Страница 114: ...S5062C DS5102MA DS5102M DS5062MA DS5062M DS5042M DS5022M Horizontal Sample Rate Range 10S s 1GS s Real Time 50GS s Equivalent DS5000CA MA 10S s 250MS s Real time 50GS s Equivalent DS5000C M Waveform I...

Страница 115: ...40M 25M DC Gain Accuracy 2mV div 5mV div 4 Sample or Average acquisition mode 10mV div 5V div 3 Sample or Average acquisition mode DC Measurement Accuracy Average Acquisition Mode Average of 16 Wavefo...

Страница 116: ...Typical Operates with input signals 50 Hz Default Settings Video Trigger Trigger mode is Auto and Coupling is AC Internal Pk pk amplitude of 2 divisions EXT 400mV Sensitivity Video Trigger Type typica...

Страница 117: ...100 240 VACRMS 50Hz CATII Power Consumption Less than 50VA Fuse 2 A T rating 250 V Power Cable IEC60245 IEC60227 250V 10A Environmental Operating 10 40 Temperature Nonoperating 20 60 Cooling Method F...

Страница 118: ...in the 10X position Power Cable that fits the standard of destination country User Manual User Registration Form Optional Accessories EM5 CM integration Communication module RS232 GPIB Pass Fail outpu...

Страница 119: ...t with a mild detergent and water Make sure the instrument is completely dry before reconnecting it to a power source To clean the exterior surface perform the following steps 1 Remove loose dust on t...

Страница 120: ......

Страница 121: ...2 36 Ext and Ext 5 2 30 F Factory Setup 2 40 FFT 2 12 FORCE 1 15 2 25 Front panel 1 2 Functional check 1 6 G GND Coulping 2 4 H Hamming Window 2 13 Hanning Window 2 13 HF Reject 2 31 Horizontal 6 2 H...

Страница 122: ...Screen Test 2 48 Self test 2 48 Single Trigger 2 31 STORAGE 2 39 Sync Pulses 2 27 T Trig Offset 1 13 Trigger 6 4 Trigger Control 1 14 Trigger System 2 25 Troubleshooting 4 3 U UltraZoom 1 12 2 8 UTILI...

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