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Performance Tests

1–86

TDS 500B, TDS 600B & TDS 700A Performance Verification and Specifications

Equipment
Required

Sine wave generator (Item 19)

Level meter and power sensor (Item 20)

Two male N to female BNC adapters (Item 23)

Two precision coaxial cables (Item 5)

Prerequisites

See page 1–15

1. Install the test hookup: Connect the equipment as shown in Figure 1–42

(start with the sine wave generator connected to the digitizing oscilloscope).

Digitizing Oscilloscope

Level

Meter

Power

Sensor

Sine Wave

Generator

Output

Input

Connect the sine wave

generator to the

oscilloscope and the

power sensor as

directed in the text.

Figure 1–42: Equipment Setup for Maximum Amplitude

2. Set the Generator:

Set the sine wave generator to a reference frequency of 10 MHz.

Adjust the sine wave generator amplitude to the required number of
divisions as measured by the digitizing oscilloscope.

3. Record the reference level:

Disconnect the sine wave generator from the digitizing oscilloscope.

Connect the sine wave generator to the power sensor.

Note the level meter reading.

Содержание TDS 500B

Страница 1: ...Technical Reference TDS 500B TDS 600B TDS 700A Digitizing Oscilloscopes Performance Verification and Specifications 070 9720 01 ...

Страница 2: ...patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Printed in the U S A Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc ...

Страница 3: ...o any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improp...

Страница 4: ......

Страница 5: ...1 19 TDS 500B 700A Test Record 1 23 Signal Acquisition System Checks 1 27 Time Base System Checks 1 43 Trigger System Checks 1 45 Output Signal Checks 1 58 Option 05 Video Trigger Checks 1 67 Sine Wave Generator Leveling Procedure 1 84 Specifications Product Description 2 1 User Interface 2 2 Signal Acquisition System 2 2 Horizontal System 2 3 Trigger System 2 4 Acquisition Control 2 5 On Board Us...

Страница 6: ...Table of Contents ii TDS 500B TDS 600B TDS 700A Performance Verification and Specifications ...

Страница 7: ...tage to a terminal that is outside the range specified for that terminal This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded To avoid electric shock or fire hazard do not opera...

Страница 8: ...ms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injur...

Страница 9: ...ER High Voltage Protective Ground Earth Terminal ATTENTION Refer to Manual Double Insulated Certifications and Compliances CSA Certification includes the products and power cords appropriate for use in the North America power network All other power cords supplied are approved for the country of use Symbols on the Product CSA Certified Power Cords ...

Страница 10: ...General Safety Summary vi TDS 500B TDS 600B TDS 700A Performance Verification and Specifications ...

Страница 11: ... also contains the technical specifications for these oscilloscopes Related Manuals The following documents are related to the use or service of the digitizing oscilloscope H The TDS 500B 600B 700A User Manual Tektronix part number 070 9719 XX H The TDS Family Programmer Manual Tektronix part number 070 9556 XX describes using a computer to control the digitizing oscillo scope through the GPIB int...

Страница 12: ...Preface viii TDS 500B TDS 600B TDS 700A Performance Verification and Specifications ...

Страница 13: ...Performance Verification Procedures ...

Страница 14: ......

Страница 15: ...do the brief procedures under Functional Tests that begin on page 1 7 Advantages These procedures require minimal additional time to perform require no additional equipment other than a standard accessory probe and more completely test the internal hardware of the oscilloscope They can be used to quickly determine if the oscilloscope is suitable for putting into service such as when it is first re...

Страница 16: ...B 724A and 782A Ch 1 Ch 2 Aux 1 and Aux 2 Conventions Throughout these procedures the following conventions apply H Each test procedure uses the following general format Title of Test Equipment Required Prerequisites Procedure H Each procedure consists of as many steps substeps and subparts as required to do the test Steps substeps and subparts are sequenced as follows 1 First Step a First Substep...

Страница 17: ...The symbol at the left is accompanied by information you must read to do the procedure properly H Refer to Figure 1 1 Main menu refers to the menu that labels the seven menu buttons under the display side menu refers to the menu that labels the five buttons to the right of the display Pop up menu refers to a menu that pops up when a main menu button is pressed Brief status information Position of ...

Страница 18: ...Performance Verification Procedures 1 4 TDS 500B TDS 600B TDS 700A Performance Verification and Specifications ...

Страница 19: ... doing this procedure 1 Verify that internal diagnostics pass Do the following substeps to verify passing of internal diagnostics a Display the System diagnostics menu H Press SHIFT then press UTILITY H Repeatedly press the main menu button System until Diag Err is highlighted in the pop up menu b Run the System Diagnostics H First disconnect any input signals from all four channels H Press the ma...

Страница 20: ...al path compensation Press the main menu button Signal Path then press the side menu button OK Compensate Signal Paths g Wait Signal path compensation may take five minutes on the TDS 500B 700A and fifteen minutes on the 600B to run While it progresses a clock icon shown at left is displayed on screen When compensation completes the status message will be updated to Pass or Fail in the main menu S...

Страница 21: ...ecommended probe STOP These procedures verify functions that is they verify that the oscilloscope features operate They do not verify that they operate within limits Therefore when the instructions in the functional tests that follow call for you to verify that a signal appears on screen that is about five divisions in amplitude or has a period of about six horizontal divisions etc do NOT interpre...

Страница 22: ...obe tip to PROBE COMPENSATION SIGNAL on the front panel connect the probe ground typically black to PROBE COMPENSA TION GND If using a P6243 or P6245 probe you may want to attach a Y lead connector and two SMD KlipChips as shown in Figure 1 3 Signal Gnd Figure 1 3 Universal Test Hookup for Functional Tests TDS 600B Shown b Initialize the oscilloscope H Press save recall SETUP H Press the main menu...

Страница 23: ...Set the horizontal SCALE to 200 ms Press CLEAR MENU to remove any menu that may be on the screen d Verify that the channel is operational Confirm that the following statements are true H The vertical scale readout for the channel under test shows a setting of 200 mV and a square wave probe compensation signal about 2 5 divisions in amplitude is on screen See Figure 1 1 on page 1 3 to locate the re...

Страница 24: ...ugh e until all four input channels are verified 3 Remove the test hookup Disconnect the probe from the channel input and the probe compensation terminals Equipment Required One probe such as the P6243 P6245 or P6139A Prerequisites None 1 Install the test hookup and preset the oscilloscope controls a Hook up the signal source Install the probe on CH 1 Connect the probe tip to PROBE COMPENSATION SI...

Страница 25: ...and the probe compensation terminals Equipment Required One probe such as the P6243 P6245 or P6139A Prerequisites None 1 Install the test hookup and preset the oscilloscope controls a Hook up the signal source Install the probe on CH 1 Connect the probe tip to PROBE COMPENSATION SIGNAL on the front panel connect the probe ground to PROBE COMPENSATION GND See Figure 1 3 on page 1 8 b Initialize the...

Страница 26: ...Delayed Triggerable then press the side menu button Delayed Only H Set the horizontal SCALE for the D delayed time base to 200 ms b Select the delayed trigger level menu H Press SHIFT then press DELAYED TRIG H Press the main menu button Level then press the side menu button Level c Confirm that the following statements are true H The trigger level readout for the delayed trigger system changes as ...

Страница 27: ... Install the probe on CH 1 Connect the probe tip to PROBE COMPENSATION SIGNAL on the front panel connect the probe ground to PROBE COMPENSATION GND See Figure 1 3 on page 1 8 b Insert the test disk Insert the disk in the disk drive to the left of the monitor H Position the disk so the metal shutter faces the drive H Position the disk so the stamped arrow is on the top right side In other words pla...

Страница 28: ...ton Recall Factory Setup and the side menu button OK Confirm Factory Init to restore the 500 ms time base and the five cycle waveform H Press the main menu button Recall Saved Setup then press the side menu button From File H Turn the general purpose knob to select the file to recall For example if you followed the instructions above and used a blank disk you had the oscilloscope assign the name T...

Страница 29: ... an extensive valid confirmation of perform ance and functionality when the following requirements are met H The cabinet must be installed on the Digitizing Oscilloscope H You must have performed and passed the procedures under Self Tests found on page 1 5 and those under Functional Tests found on page 1 7 H A signal path compensation must have been done within the recommended calibration interval...

Страница 30: ... 6 Connector Dual Banana two required Female BNC to dual banana Tektronix part number 103 0090 00 Various Accuracy Tests 7 Connector BNC T Male BNC to dual female BNC Tektronix part number 103 0030 00 Checking Trigger Sensitivity 8 Coupler Dual Input Female BNC to dual male BNC Tektronix part number 067 0525 02 Checking Delay Between Channels 9 Generator DC Calibra tion Variable amplitude to 104 V...

Страница 31: ...vity 21 Splitter Power Frequency range DC to 1 GHz Tracking 2 0 Rohde Schwarz RVZ3 Checking Analog Bandwidth 22 Generator Function Frequency range 5 MHz to 10 MHz Square wave transition time v25 ns Amplitude range 0 to 10 Vp p into 50 W Tektronix CFG280 Checking External Clock 23 Adapter four required Male N to female BNC Tektronix 103 0045 00 Checking Analog Bandwidth 24 Adapter Female N to male ...

Страница 32: ...Performance Tests 1 18 TDS 500B TDS 600B TDS 700A Performance Verification and Specifications ...

Страница 33: ... __________ __________ __________ 1 45 mV 69 1 mV 691 mV DC Voltage Measurement Accuracy Averaged CH1 5 mV Vert scale setting 5 Div position setting 1 V offset 1 0329 V __________ __________ 1 0471 V CH1 5 mV Vert scale setting 5 Div position setting 1 V offset 1 0471 V __________ __________ 1 0329V CH1 200 mV Vert scale setting 5 Div position setting 10 V offset 11 4165 V __________ __________ 11...

Страница 34: ...____ 11 4165 V CH3 1 V Vert scale setting or AX1 5 Div position setting 10 V offset 17 2425 V __________ __________ 18 7575 V CH3 1 V Vert scale setting or AX1 5 Div position setting 10 V offset 18 7575 V __________ __________ 17 2425 V CH4 5 mV Vert scale setting or AX2 5 Div position setting 1 V offset 1 0329 V __________ __________ 1 0471 V CH4 5 mV Vert scale setting or AX2 5 Div position sett...

Страница 35: ..._________ 10 137 V Main Trigger DC Coupled Negative Slope 9 863 V __________ __________ 10 137 V Delayed Trigger DC Coupled Positive Slope 9 863 V __________ __________ 10 137 V Delayed Trigger DC Coupled Negative Slope 9 863 V __________ __________ 10 137 V CH1 Sensitivity 50 MHz Main Pass Fail __________ __________ Pass Fail CH1 Sensitivity 50 MHz Delayed Pass Fail __________ __________ Pass Fai...

Страница 36: ...of Calibration Technician TDS 600B Performance Test Maximum Outgoing Incoming Minimum CH 3 or AX1 SIGNAL OUTPUT 1 MW Pk Pk 80 mV __________ __________ Pk Pk 120 mV CH 3 or AX1 SIGNAL OUTPUT 50 W Pk Pk 40 mV __________ __________ Pk Pk 60 mV Probe Compensator Output Signal Frequency CH1 Freq 950 Hz __________ __________ 1 050 kHz Voltage difference 495 mV __________ __________ 505 mV ...

Страница 37: ...______ __________ __________ __________ 1 6 mV 25 1 mV 251 mV DC Voltage Measurement Accuracy Averaged CH1 5 mV Vert scale setting 5 Div position setting 1 V offset 1 0355 V __________ __________ 1 0445 V CH1 5 mV Vert scale setting 5 Div position setting 1 V offset 1 0445 V __________ __________ 1 0355 V CH1 200 mV Vert scale setting 5 Div position setting 10 V offset 11 5195 V __________ _______...

Страница 38: ..._________ 11 5195 V CH3 1 V Vert scale setting or AX1 5 Div position setting 10 V offset 17 7575 V __________ __________ 18 2425 V CH3 1 V Vert scale setting or AX1 5 Div position setting 10 V offset 18 2425 V __________ __________ 17 7575 V CH4 5 mV Vert scale setting or AX2 5 Div position setting 1 V offset 1 0355 V __________ __________ 1 0445 V CH4 5 mV Vert scale setting or AX2 5 Div position...

Страница 39: ...7 V Main Trigger DC Coupled Negative Slope 9 9393 V __________ __________ 10 1147 V Delayed Trigger DC Coupled Positive Slope 9 9393 V __________ __________ 10 1147 V Delayed Trigger DC Coupled Negative Slope 9 9393 V __________ __________ 10 1147 V CH1 Sensitivity 50 MHz Main Pass Fail __________ __________ Pass Fail CH1 Sensitivity 50 MHz Delayed Pass Fail __________ __________ Pass Fail CH1 AUX...

Страница 40: ...f Calibration Technician TDS 500B 700A Performance Test Maximum Outgoing Incoming Minimum CH 3 or AX 1 SIGNAL OUTPUT 1 MW Pk Pk 88 mV __________ __________ Pk Pk 132 mV CH 3 or AX 1 SIGNAL OUTPUT 50 W Pk Pk 44 mV __________ __________ Pk Pk 66 mV Probe Compensator Output Signal Frequency CH1 Freq 950 Hz __________ __________ 1 050 kHz Voltage difference 495 mV __________ __________ 505 mV ...

Страница 41: ... from the screen b Modify the default settings H Press SHIFT then press ACQUIRE MENU H On the TDS 600B press the main menu button Mode then press the side menu button Average 16 H On the TDS 500B and 700A press the main menu button Mode then press the side menu button Hi Res H Press CURSOR H Press the main menu button Function then press the side menu button H Bars H Press CLEAR MENU H Be sure to ...

Страница 42: ... 756 mV 251 mV 1 Vertical position is set to 0 divisions and vertical offset to 0 V when the oscilloscope is initialized in step 1 c Display the test signal The waveform position and offset were initialized for all channels in step 1 and are displayed as you select each channel and its vertical scale d Measure the test signal Align the active cursor over the waveform by rotating the general purpos...

Страница 43: ...required WARNING The generator is capable of outputting dangerous voltages Be sure to set the DC calibration generator to 0 volts before connecting disconnecting and or moving the test hookup during the performance of this procedure Equipment Required Two dual banana connectors Item 6 One BNC T connector Item 7 One DC calibration generator Item 9 Two precision coaxial cables Item 5 Prerequisites T...

Страница 44: ...ble to the other side of the BNC T connector Now connect the BNC T connector to CH 1 See Figure 1 5 DC Calibrator 50 W Coaxial Cables Dual Banana to BNC Adapters BNC T Connector Digitizing Oscilloscope Output Sense Figure 1 5 Initial Test Hookup b Initialize the oscilloscope H Press save recall SETUP H Press the main menu button Recall Factory Setup H Press the side menu button OK Confirm Factory ...

Страница 45: ...l SCALE to one of the settings listed in Table 1 3 that is not yet checked Start with the first setting listed Table 1 3 DC Voltage Measurement Accuracy Scale Setting Position Set ting Divs Offset Setting Generator Setting TDS 600B Accuracy Limits TDS 500B 700A Accuracy Limits 5 mV 5 1 V 1 040 V 1 0329 V to 1 0471 V 1 0355 V to 1 0445 V 5 V 1 V 1 040 V 1 0471 V to 1 0329 V 1 0445 V to 1 0355 V 200...

Страница 46: ... Measure the test signal Press CLEAR MENU Read the measurement results at the Mean measurement readout See Figure 1 6 Turn on the measurement called mean and read the results here Figure 1 6 Measurement of DC Accuracy at Maximum Offset and Position f Check against limits H CHECK that the readout for the measurement Mean readout on screen is within the limits listed for the current vertical scale a...

Страница 47: ...em 23 Two 50 W precision cables Item 5 Two 10X attenuators Item 1 Optional One high frequency leveled sine wave generator and its leveling head Item 26 replaces items 19 20 21 23 24 and 5 Prerequisites See page 1 15 1 Install the test hookup and preset the instrument controls a Initialize the oscilloscope H Press save recall SETUP Press the main menu button Recall Factory Setup then press the side...

Страница 48: ...sine wave generator with a leveling head item 26 see Figure 1 8 and if using this optional setup with the example Tektronix SG 504 set the generator output to 6 MHz Digitizing Oscilloscope Sine Wave Generator Output Figure 1 7 Initial Test Hookup High Frequency Sine Wave Generator example Tek SG 504 Digitizing Oscilloscope Output Leveling Head Figure 1 8 Optional Initial Test Hookup 2 Confirm the ...

Страница 49: ... Re ere ce Ampli e ri al Test Frequency imi Vertical Scale Reference Amplitude Horizontal Scale TDS 680B TDS 684B TDS 782A TDS 784A TDS 620B TDS 644B TDS 520B TDS 540B TDS 724A TDS 754A Limits 100 mV 600 mV 6 divisions 1 ns 1 GHz 500 MHz 500 MHz 424 mV 1 V 5 V 5 divisions 1 ns 1 GHz 500 MHz 500 MHz 3 535 V 500 mV 3 V 6 divisions 1 ns 1 GHz 500 MHz 500 MHz 2 121 V 200 mV 1 2 V 6 divisions 1 ns 1 GH...

Страница 50: ...H Press the front panel button SET LEVEL TO 50 as necessary to trigger a stable display At full bandwidth you may also want to make small manual adjustments to the trigger level You can use the TRIGGER LEVEL knob to do this Full bandwidth varies with TDS model as is shown in Table 1 4 f Measure the test signal H Set the frequency of the generator as shown on screen to the test frequency in Table 1...

Страница 51: ...vertical scale setting H Enter voltage on test record H When finished checking set the horizontal SCALE back to the 50 ns setting STOP Checking each channel s bandwidth at all vertical scale settings is time consuming and unnecessary You may skip checking the remaining vertical scale settings in Table 1 4 that is skip the following substep h if this digitizing oscilloscope has performed as follows...

Страница 52: ...w channel H Install remove 10X attenuators between the generator leveling head and the channel input as needed to obtain the six division reference signals listed in the table i Test all channels Repeat substeps a through g for all four channels 3 Disconnect the hookup Disconnect the test hook up from the input connector of the channel last tested Equipment Required One sine wave generator Item 19...

Страница 53: ... sine wave generator item 19 or optionally 25 to a 50 W precision coaxial cable followed by a 50 W termination and a dual input coupler See Figure 1 10 H Connect the coupler to both CH 1 and CH 2 See Figure 1 10 Sine Wave Generator Dual Input Coupler Digitizing Oscilloscope 50 W Terminator Output Figure 1 10 Initial Test Hookup 2 Confirm all four channels are within limits for channel delay a Set ...

Страница 54: ...e menu button To Ref 3 e Display all test signals H Press WAVEFORM OFF to remove CH 3 AX1 on some TDS models from the display H Display the live waveform Move the coupler from CH 3 to CH 4 so that CH 1 and CH 4 are driven Press CH 4 to display Be sure the vertical scale factor is kept at 1 0X See Figure 1 11 on page 1 41 Use AX1 and AX2 instead of CH3 and CH4 if your TDS model is so equipped H Dis...

Страница 55: ...aveforms 2 Display the waveforms 1 Read results 4 Align each cursor to the time reference points 3 Figure 1 11 Measurement of Channel Delay TDS 684B Shown g Check against limits CHECK that the cursor readout on screen is 100 ps for the TDS 600B or 50 ps for the TDS 500B 700A h If the channel skew is within the limits enter time on the test record and proceed to step 3 Otherwise proceed with steps ...

Страница 56: ...ment to the second CH1 to CH3 skew measurement and divide the result by 2 Use Table 1 5 n Add the first CH1 to CH4 AX2 on some TDS models skew measure ment to the second CH1 to CH4 skew measurement and divide the result by 2 Use Table 1 5 o Check against limits CHECK that the largest of the three results from steps l m and n is between 100 ps and 100 ps for the TDS 600B or between 50 ps and 50 ps ...

Страница 57: ...et the instrument controls a Hook up the test signal source Connect through a 50 W precision coaxial cable the time mark output of a time mark generator to CH 1 Set the output of the generator for 10 ms markers b Initialize the oscilloscope H Press save recall SETUP Press the main menu button Recall Factory Setup Press the side menu button OK Confirm Factory Init c Modify the initialized front pan...

Страница 58: ...ss HORIZONTAL MENU H Set horizontal modes To do this press the main menu button Time Base Press the side menu buttons Delayed Only and Delayed Runs After Main See Figure 1 13 b Measure the test signal H Set the horizontal SCALE of the D delayed time base to 500 ns for the TDS 600B or to 100 ns for the TDS 500B 700A H Set delayed time to 10 ms Do this on the keypad by pressing 10 then SHIFT then m ...

Страница 59: ...and Delay Time 3 Disconnect the hookup Disconnect the cable from the generator output at the input connector of CH 1 Trigger System Checks These procedures check those characteristics that relate to the Main and Delayed trigger systems and are listed as checked in Specifications Equipment Required One medium frequency sine wave generator Item 19 or optionally item 25 One 10X attenuator Item 1 One ...

Страница 60: ...ntal SCALE to 10 ns on the TDS 600B and 12 5 ns on the TDS 500B 700A c Hook up the test signal source Connect the output of a medium frequency leveled sine wave generator Item 25 to CH 1 Do this through a 50 W precision coaxial cable followed by a 10X attenuator See Figure 1 14 50 W Coaxial Cable Medium Frequency Sine Wave Generator Digitizing Oscilloscope Output 10X Attenuator Figure 1 14 Initial...

Страница 61: ...Press the side menu button Lower Limit Use the keypad to set the lower limit to 2 ns d Change limits until triggering stops H Press SET LEVEL TO 50 H While doing the following subparts monitor the display it will stop acquiring and the front panel light TRIG it will extinguish to determine when triggering is lost H Press the side menu button Lower Limit H Use the general purpose knob to increase t...

Страница 62: ... at 250 kHz H Press the side menu button Upper Limit Use the keyboard to set the upper limit to 4 ms H Press the side menu button Lower Limit Use the keypad to set the lower limit to 500 ns b Display the test signal H Set the horizontal SCALE to 5 ms H Set the output of the sine wave generator for a 250 kHz five division sine wave on screen Set the vertical SCALE to 20 mV the waveform will overdri...

Страница 63: ...fter the oscilloscope loses triggering is within 1 9 ms to 2 1 ms inclusive H Enter time on test record 4 Disconnect the hookup Disconnect the cable from the generator output at the input connector of CH 1 Equipment Required One DC calibration generator Item 9 One BNC T connector Item 7 Two 50 W precision coaxial cables Item 5 Prerequisites See page 1 15 DC Calibrator 50 W Coaxial Cables Dual Bana...

Страница 64: ...irm Main trigger system is within limits for Trigger level Threshold accuracy a Display the test signal H Set the vertical SCALE to 200 mV H Press VERTICAL MENU then press the main menu button Position H Set vertical position to 3 divisions press 3 then ENTER on the keypad The baseline level will move down three divisions See Figure 1 17 on page 1 51 H Press the main menu button Offset H Set verti...

Страница 65: ...hen press the side menu button for negative slope See icon at left Repeat substep b H CHECK that the Level readout in the main menu is within 9 863 V to 10 137 V inclusive for the TDS 600B or is within 9 9393 V to 10 1147 V inclusive for the TDS 500B 700A H Enter voltage on test record Set DC calibration generator to equal offset 10 V 2 Set vertical position to 3 divs Set vertical offset to 10 vol...

Страница 66: ...e following subparts in the order listed H CHECK that the Level readout in the side menu is within 9 863 V to 10 137 V inclusive for the TDS 600B or is within 9 9393 V to 10 1147 V inclusive for the TDS 500B 700A H Enter voltage on test record H Press the main menu button Slope then press the side menu button for negative slope See icon at left Press the main menu button Level Repeat substep c H C...

Страница 67: ...ime Base H Press the side menu button Delayed Only then press the side menu button Delayed Triggerable H Set the horizontal SCALE for the D delayed time base to 20 ns on the TDS 600B or 25 ns on the TDS 500B 700A then press the side menu button Main Only H Press TRIGGER MENU then press the main menu button Mode Holdoff Press the side menu button Normal H Press VERTICAL MENU then press the main men...

Страница 68: ...left Press the side menu button Amplitude H Press SET LEVEL TO 50 H Press CLEAR MENU H Set the test signal amplitude for about three and a half divisions on screen Now fine adjust the generator output until the CH 1 Amplitude readout indicates the amplitude is 350 mV Readout may fluctuate around 350 mV H Disconnect the 50 W precision coaxial cable at CH 1 and reconnect it to CH 1 through a 10X att...

Страница 69: ...st waveform on both the positive and negative slopes Use the side menu to switch between trigger slopes H Enter pass fail result for main trigger on the test record H Leave the Main trigger system triggered on the positive slope of the waveform before continuing to the next step Check if stable trigger Figure 1 19 Measurement of Trigger Sensitivity 50 MHz Results Shown on a TDS 684B Screen c Check...

Страница 70: ...me Base Press the side menu button Main Only H Press CLEAR MENU 3 Confirm the AUX Trigger input a Display the test signal H Remove the 10X attenuator and reconnect the cable to CH 1 H Set the test signal amplitude for about 2 5 divisions on screen H Now fine adjust the generator output until the CH 1 Amplitude readout indicates the amplitude is 250 mV Readout may fluctuate around 250 mV b Check th...

Страница 71: ... Time base then press the side menu button Delayed Triggerable H Press the side menu button Delayed Only H Set the horizontal SCALE to 500 ps for the D Delayed time base Press the side menu button Main Only c Display the test signal H Set the generator frequency to full bandwidth as follows TDS 680B 684B 782A 784A 1 GHz TDS 520B 540B 620B 644B 724A 754A 500 MHz H Set the test signal amplitude for ...

Страница 72: ...nels vs Model on page 1 2 1 Install the test hookup and preset the instrument controls 50 W Coaxial Cables To MAIN TRIGGER OUT Calibration Generator Digitizing Oscilloscope Figure 1 20 Initial Test Hookup a Hook up test signal source 1 H Connect the standard amplitude output of a calibration generator through a 50 W precision coaxial cable to CH 3 AX1 on some TDS models H Set the output of the cal...

Страница 73: ...OSITION knob to center the display on screen b Measure logic levels H Press MEASURE then press the main menu button Select Measurement for Ch2 H Select high and low measurements To do this repeatedly press the side menu button more until High and Low appear in the side menu their icons are shown at the left Press both side menu buttons High and Low c Check Main Trigger output against limits H CHEC...

Страница 74: ...that the Ch2 High readout is 1 0 volt and that the Ch2 Low readout 0 25 volts H Enter high and low voltages on test record H Press the side menu button W to select the 1 MW setting H Press CLEAR MENU H CHECK that the Ch2 High readout is 2 5 volts and that the Ch2 Low readout is 0 7 volts H Enter high and low voltages on test record 3 Confirm CH 3 Ax1 on some TDS models output is within limits for ...

Страница 75: ...e side menu button Pk Pk H Press CLEAR MENU b Check against limits H CHECK that the readout Ch2 Pk Pk is between 80 mV and 120 mV inclusive for the TDS 600B or is between 88 mV and 132 mV inclusive for the TDS 500B 700A H Enter voltage on test record H Press VERTICAL MENU then press the side menu button W to toggle to the 50 W setting H Press CLEAR MENU H CHECK that the readout Ch2 Pk Pk is betwee...

Страница 76: ...et the instrument controls a Hook up test signal H Connect one of the 50 W cables to CH 1 See Figure 1 22 H Connect the other end of the cable just installed to the female BNC to clips adapter See Figure 1 22 H Connect the red clip on the adapter just installed to the PROBE COMPENSATION SIGNAL on the front panel connect the black clip to PROBE COMPENSATION GND See Figure 1 22 Digitizing Oscillosco...

Страница 77: ... general purpose knob 2 Confirm that the Probe Compensator signal is within limits for frequency a Measure the frequency of the probe compensation signal H Press MEASURE then press the main menu button Select Measrmnt for Ch1 H Repeatedly press the side menu button more until Frequency appears in the side menu its icon is shown at the left Press the side menu button Frequency b Check against limit...

Страница 78: ...H Disconnect the cable from CH 1 and the clips from the probe compensation terminals H Press MORE then press the main menu button Ref 1 to displayed the stored signal H Press CH 1 d Hook up the DC standard source H Set the output of a DC calibration generator to 0 volts H Connect the output of a DC calibration generator through a dual banana connector followed by a 50 W precision coaxial cable to ...

Страница 79: ...CQUIRE MENU Press the side menu button AVERAGE then enter 16 using the keypad or the general purpose knob H Adjust the output of the DC calibration generator until it precisely overlaps the top upper level of the stored probe compensation signal This value will be near 500 mV H Record the setting of the DC generator H Adjust the output of the DC calibration generator until it precisely overlaps th...

Страница 80: ...ment of Probe Compensator Amplitude g Check against limits H Subtract the value just obtained base level from that obtained previously top level H CHECK that the difference obtained is within 495 mV to 505 mV inclusive H Enter voltage difference on test record 3 Disconnect the hookup Disconnect the cable from CH 1 ...

Страница 81: ... factory defaults by completing the following steps a Press save recall SETUP b Press the main menu Recall Factory Setup c Press the side menu OK Confirm Factory Init d Wait for the Clock Icon to leave the screen e CONFIRM the digitizing oscilloscope is setup as shown below Channel CH1 Volt div 100 mV Horizontal scale 500 ms div 2 Set up digitizing oscilloscope for TV triggers by completing the fo...

Страница 82: ...200 SHIFT n then ENTER 3 Check Jitter vs Signal Amplitude a Set up equipment for Jitter Test See Figure 1 26 H Connect one of the rear panel composite outputs marked COMPST on the TSG121 through a 75 W cable and a 75 W terminator to the CH1 input of the TDS H Press the 100 FIELD control the fourth TSG121 front panel button from the left of the PAL signal source PAL Signal Source Digitizing Oscillo...

Страница 83: ... It should be already set to 16 f Press the main menu Create Limit Test Template g Press the side menu V Limit h Use the keypad to set V Limit to 180 mdiv press 180 SHIFT m then ENTER i Press the side menu OK Store Template j Press MORE k Press the main menu Ref1 l Press CH1 m Press SHIFT then press ACQUIRE MENU n Press the main menu Limit Test Setup o Toggle the side menu Limit Test to ON p Toggl...

Страница 84: ...firm that the oscilloscope successfully makes 100 acquisitions If not successful the oscilloscope bell will ring When the word Run in the top left corner of the display changes to STOP the test is complete See Figure 1 28 Stop shows test complete Figure 1 28 Jitter Test When Completed TDS 684B Shown w Press the main menu Limit Test Setup x Toggle the side menu Ring Bell if Condition Met to OFF y T...

Страница 85: ...nu Stop After g Press the side menu RUN STOP button only h Press the main menu Mode i Press the side menu Sample j Press RUN STOP k Press VERTICAL MENU l Use the keypad to set fine scale to 300 mV press 300 SHIFT m then ENTER m CONFIRM that the TRIG D LED stays lighted and that the waveform on screen is stable That is it does not move horizontally or vertically Also CONFIRM that the waveform on th...

Страница 86: ...nal Range Test 300 mV n Use the keypad to set the fine scale to 75 mV press 75 SHIFT m then ENTER o CONFIRM that the TRIG D LED stays lighted and that the waveform on screen is stable That is it does not move horizontally or vertically Also CONFIRM that the waveform on the screen has one positive pulse and a number of negative pulses See Figure 1 30 ...

Страница 87: ...p oscilloscope for 60 Hz Rejection Test H Use the keypad to set the Ch1 Fine Scale to 282 mV press 282 SHIFT m then ENTER H Press WAVEFORM OFF H Press CH2 H Press VERTICAL MENU H Use the keypad set the fine scale to 2 V press 2 then ENTER H Press HORIZONTAL MENU H Use the keypad to set the horizontal scale div to 5 ms press 5 SHIFT m then ENTER b Set up 60 Hz signal generator H Connect the output ...

Страница 88: ...enerator for three vertical divisions of 60 Hz signal See Figure 1 32 The signal will not be triggered That is it will run free Figure 1 32 60 Hz Rejection Test Setup Signal c Check 60 Hz rejection H Use the keypad to set the horizontal scale div to 50 ms press 50 SHIFT m then ENTER H Reconnect the output of the signal generator Connect the composite signal connector of the PAL signal source label...

Страница 89: ...T on the TSG 121 through a 75 W cable and a 75 W terminator to the CH2 input See Figure 1 33 PAL Signal Source BNC T Connector 75 W Terminators Digitizing Oscilloscope 50 W Cable Signal Generator 75 W Cable 75 W Cable COMPST COMPST Output Figure 1 33 Subsequent 60 Hz Rejection Test Hookup H CONFIRM that the TRIG D LED stays lighted and that the waveform on screen is stable In other words be sure t...

Страница 90: ...L MENU H Press the main menu Record Length H Press the side menu more until you see the appropriate menu H Press the side menu 5000 points in 100divs H Press the main menu Horiz Scale div H Use the keypad to set the horizontal scale to 200 ns press 200 SHIFT n then ENTER b Check Line Count Accuracy H Connect a composite output signal from the rear of the PAL signal source labeled COMPST on the TSG...

Страница 91: ...5 W Terminator Output Figure 1 35 Line Count Accuracy Test Hookup H Press the main menu Trigger Position H Press the side menu to Set to 50 H Press the main menu to Horiz Pos H Press the side menu to Set to 50 H Use the HORIZONTAL POSITION knob to move the falling edge of the sync pulse to two divisions to the left of center screen See Figure 1 36 ...

Страница 92: ...n H Press the side menu V Bars H Using the General Purpose knob place the left cursor directly over the trigger T icon H Press SELECT H Turn the General Purpose knob to adjust the right cursor for a cursor delta reading of 6 780us H Use the HORIZONTAL POSITION knob to position the right cursor to center screen H Verify that the cursor is positioned on a positive slope of the burst signal See Figur...

Страница 93: ...unction button and finally Off from the side menu 7 Check the Sync Duty Cycle a Set up digitizing oscilloscope for Sync Duty Cycle Test H Press TRIGGER MENU H Press the Standard pop up to select FlexFmt Trigger Type should already be set to Video H Press the main menu Setup H Press the side menu Field Rate H Use the keypad to set the field rate to 60 05 Hz press 60 05 then ENTER H Press the side m...

Страница 94: ...50 SHIFT m then ENTER H Press the main menu Type pop up to select Edge H Press HORIZONTAL MENU H Press the main menu Record Length H Select the side menu 1000 points in 20div If needed first press the side menu more until you see the appropriate side menu item H Turn the HORIZONTAL POSITION knob to position the trigger T two divisions to the left of the center screen H Press MEASURE H If needed pr...

Страница 95: ...or to the oscilloscope CH1 input See Figure 1 38 Pulse Generator Digitizing Oscilloscope 50 W Cable 50 W Terminator Output Figure 1 38 Setup for Sync Duty Cycle Test H Turn the pulse generator OUTPUT VOLTS control until the signal on the oscilloscope shows a one division negative going pulse See Figure 1 39 NOTE You may need to adjust the trigger level control to obtain a stable trigger ...

Страница 96: ...ns 10 ns H Turn the HORIZONTAL SCALE knob to set the oscilloscope time base to 5ms div H Turn the pulse generator PERIOD variable control to adjust the period until the oscilloscope CH1 Period measurement reads 21 000ms 25 50 ns See Figure 1 40 Read note shown below NOTE The pulse duration and period adjustments are critical in making this measurement If the pulse duration and or the duty cycle ar...

Страница 97: ...riod measurements are adjusted correctly See note above CONFIRM that the setup is correct and the oscilloscope will trigger H CONFIRM that the TRIG D LED is lighted and the waveform is stable H Disconnect the signal source from CH1 wait a few seconds then reconnect the signal H CONFIRM that the TRIG D LED is lighted and the waveform is stable H Press Sync Polarity H Press Pos Sync H Push the pulse...

Страница 98: ...on Recall Factory Setup and the side menu OK Confirm Factory Init Sine Wave Generator Leveling Procedure Some procedures in this manual require a sine wave generator to produce the necessary test signals If you do not have a leveled sine wave generator use one of the following procedures to level the output amplitude of your sine wave generator Equipment Required Sine wave generator Item 19 Level ...

Страница 99: ...rator to a reference frequency of 10 MHz H Adjust the sine wave generator amplitude to the required number of divisions as measured by the digitizing oscilloscope 3 Record the reference level Note the reading on the level meter 4 Set the generator to the new frequency and reference level H Change the sine wave generator to the desired new frequency H Input the correction factor for the new frequen...

Страница 100: ...oscope Digitizing Oscilloscope Level Meter Power Sensor Sine Wave Generator Output Input Connect the sine wave generator to the oscilloscope and the power sensor as directed in the text Figure 1 42 Equipment Setup for Maximum Amplitude 2 Set the Generator H Set the sine wave generator to a reference frequency of 10 MHz H Adjust the sine wave generator amplitude to the required number of divisions ...

Страница 101: ...o the desired new frequency H Input the correction factor for the new frequency into the level meter H Adjust the sine wave generator amplitude until the level meter again reads the value noted in step 3 The signal amplitude is now correctly set for the new frequency H Disconnect the sine wave generator from the power sensor H Connect the sine wave generator to the digitizing oscilloscope ...

Страница 102: ...Performance Tests 1 88 TDS 500B TDS 600B TDS 700A Performance Verification and Specifications ...

Страница 103: ...Specifications ...

Страница 104: ......

Страница 105: ...s TDS 520B 724A 1 GS s Opt 1G TDS 540B 1 GS s Analog bandwidth TDS 680B 684B 782A and 784A 1 GHz TDS 520B 540B 620B 644B 724A and 754A 500 MHz No of Channels TDS 644B 684B 4 TDS 620B 680B 2 21 TDS 540B 754A 784A 4 TDS 520B 724A 782A 2 21 Record lengths maximum 15 000 samples 50 000 samples 500 000 with option 1M Acquisition modes Sample envelope peak detect and average Sample envelope average high...

Страница 106: ...omatic parameter extraction feature called measure to display the results of measurements made or the status of the instrument Assign the general purpose knob to adjust a selected parameter function More quickly change parameters by toggling the SHIFT button Use the same method as for selecting a function except the final side menu selection assigns the general purpose knob to adjust some function...

Страница 107: ...lled Fit to Screen allows you to view entire waveform records within the 10 division screen area Waveforms are compressed to fit on the screen See Table 2 2 Both the delayed only display and the intensified zone on the main intensified display may be delayed by time with respect to the main trigger Both can be set to display immediately after the delay delayed runs after main mode The delayed disp...

Страница 108: ...equipped only 130000 2 600 divs 13 divs TDS 520B TDS 724A TDS 782A one channel only TDS 540B TDS 754A TDS 784A two channels only Option 1M equipped only 250000 5 000 divs 10 divs TDS 540B TDS 754A TDS 784A one channel only Option 1M equipped only 500000 10 000 divs 10 divs 1 Fit to Screen setting 2 Fit to Screen off preserves 50 samples division in a 1 2 5 sec division sequence 3 Fit to Screen on ...

Страница 109: ... compatible with standard NTSC PAL SECAM and HDTV formats An additional feature called FlexFormatTM flexible format allows the user to define the video format on which to trigger You can choose where the trigger point is located within the acquired waveform record by selecting the amount of pretrigger data displayed Presets of 10 50 and 90 of pretrigger data can be selected in the horizontal menu ...

Страница 110: ...quency Paired cursors measure both amplitude and time simultaneously These are delta measurements that is measurements based on the difference between two cursors Both H Bar and V Bar cursors can also be used to make absolute measurements For the H Bars either cursor can be selected to read out its voltage with respect to any channel s ground reference level For the V Bars the cursors measure time...

Страница 111: ...ble of sending and receiving waveforms over the GPIB interface IEEE Std 488 1 1987 IEEE Std 488 2 1987 standard This feature makes the instrument ideal for making automated measurements in a production or research and development environment that calls for repetitive data taking Self compensation and self diagnostic features built into the Digitizing Oscilloscope to aid in fault detection and serv...

Страница 112: ...orms readouts and graticule H Style of waveform display s vectors or dots intensified or nonintensified samples infinite persistence and variable persistence H Interpolation method Sin x x or Linear H Display format xy or yt with various graticule selections including NTSC and PAL to be used with video trigger option 05 This oscilloscope also provides an easy way to focus in on those waveform feat...

Страница 113: ... DC AC or GND Input Impedance Selections 1 MW or 50 W Ranges Offset Volts Div Setting Offset Range 1 mV div 100 mV div 101 mV div 1 V div 1 01 V div 10 V div 1 V 10 V 100 V Range Position 5 divisions Range 1 MW Sensitivity 1 mV div to 10 V div2 Range 50 W Sensitivity 1 mV div to 1 V div2 1 Displayed vertically with 25 digitization levels DLs per division and 10 24 divisions dynamic range with zoom...

Страница 114: ... 520B 540B 724A and 754A 1 GSamples sec to 100 GSamples sec TDS 782A and 784A 2 GSamples sec to 250 GSamples sec Range Seconds Division TDS 600B 0 2 ns div to 10 s div TDS 500B 724A and 754A 0 5 ns div to 10 s div TDS 782A and 784A 0 2 ns div to 10 s div Record Length Selection 500 samples 1000 samples 2500 samples 5000 samples 15000 samples The TDS 520B 724A and 782A also offer 50000 samples and ...

Страница 115: ... mean a data transition before the clock edge and negative means a transition after the clock edge For Hold Time positive numbers mean a data transition after the clock edge and negative means a transition before the clock edge Setup Hold Time is the algebraic sum of the Setup Time and the Hold Time programmed by the user Ranges Trigger Level or Threshold Source Range Any Channel Auxiliary Line 12...

Страница 116: ...S 232 interface complies with EIA TIA 574 talk only Optional on the TDS 520B and 540B Interface Centronics Centronics interface complies with Centronics interface standard C332 44 Feb 1977 REV A Interface Video VGA video output with levels that comply with EIA RS 343A standard DB 15 connector Logic Polarity for Main and Delayed Trigger Outputs Negative TRUE High to low transition indicates the tri...

Страница 117: ...inyl clad aluminum cabinet Weight Standard Digitizing Oscilloscope 14 1 kg 31 lbs with front cover 24 0 kg 53 lbs when packaged for domestic shipment Rackmount Digitizing Oscilloscopes 14 1 kg 31 lbs plus weight of rackmount parts for the rackmounted Digitizing Oscilloscopes Option 1R Rackmount conversion kit 2 3 kg 5 lbs parts only 3 6 kg 8 lbs parts plus package for domestic shipping Overall Dim...

Страница 118: ...Nominal Traits 2 14 TDS 500B TDS 600B TDS 700A Performance Verification and Specifications ...

Страница 119: ...tated above this section lists only warranted characteristics A list of typical characteristics starts on page 2 23 Performance Conditions The performance limits in this specification are valid with these conditions H The oscilloscope must have been calibrated adjusted at an ambient tempera ture between 20_ C and 30_ C H The oscilloscope must be in an environment with temperature altitude humidity...

Страница 120: ... 700A Off set Accuracy 1 mV div 100 mV div 0 2 Net Off set1 1 5 mV 0 6 div x V div 0 2 Net Off set1 1 5 mV 0 1 div x V div 101 mV div 1 V div 0 25 Net Off set1 15 mV 0 6 div x V div 0 25 Net Off set1 15 mV 0 1 div x V div 1 01 V div 10 V div 0 25 Net Off set1 150 mV 0 6 div x V div 0 25 Net Off set1 150 mV 0 1 div x V div Analog Bandwidth DC 50 W Coupled and Bandwidth selection is FULL T S 6 B Vol...

Страница 121: ...ve 1 MHz CAT II Input Voltage Maximum DC 50 W or AC 50 W Coupled 5 VRMS with peaks 30 V Lower Frequency Limit AC Coupled 10 Hz when AC 1 MW Coupled 200 kHz when AC 50 W Coupled3 1 Net Offset Offset Position Volts Div Net Offset is the nominal voltage level at the oscilloscope input that corresponds to the center of the A D converter s dynamic range Offset Accuracy is the accuracy of this voltage l...

Страница 122: ...Width Triggering 1 ns to 1 ms 1 02 ms to 1 s 20 of setting 0 5 ns 100 ns 0 01 of Setting Input Signal Sync Amplitude for Stable Triggering NTSC and PAL modes Option 05 Video Trigger Field selection Odd Even or All 0 6 division to 4 divisions Field selection Numeric 1 division to 4 divisions NTSC mode Jitter Option 05 Video Trigger 60 nsp p on NTSC or PAL signal 1 The minimum sensitivity for obtain...

Страница 123: ...CH 3 AUX 1 on the TDS 620B or 680B is selected as the trigger source for the main and or delayed trigger systems It is not available when a channel other than CH3 AUX 1 on the TDS 620B or 680B is the source for the Video Trigger when Option 05 is installed Table 2 14 Warranted Characteristics Environmental Name Description Atmospherics Temperature no diskette in floppy drive TDS 600B Operating 4_ ...

Страница 124: ...nic Emissions Emissions TDS 600B 1 2 Meets or exceeds the requirements of the following standards FCC Code of Federal Regulations 47 CFR Part 15 Subpart B Class A EN 50081 1 European Community Requirements EN 55022 Radiated Emissions Class B EN 55022 Class B Conducted Emissions EN60555 2 Power Line Harmonic Emissions Susceptibility1 2 Meets or exceeds the EMC requirements of the following standard...

Страница 125: ...ing 200 meters Equipment Type Test and Measurement Safety Class Class I as defined in IEC 1010 1 Annex H grounded product Overvoltage Catregory Overvoltage Category II as defined in IEC 1010 1 Annex J Pollution Degree Pollution Degree 2 as defined in IEC 1010 1 Note Rated for indoor use only Table 2 15 Certifications and compliances EC Declaration of Conformity Meets intent of Directive 89 336 EEC...

Страница 126: ...Warranted Characteristics 2 22 TDS 500B TDS 600B TDS 700A Performance Verification and Specifications ...

Страница 127: ...ut on Screen TDS 782A 784A with P6245 Probe and Ba i elec i i U 10 V div 100 V div Not Applicable Bandwidth selection is FULL TDS 782A 784A 100 mV div 10 V div DC 1 GHz T S 782A 784A 50 mV div 99 5 mV div DC 750 MHz 20 mV div 49 8 mV div DC 600 MHz 10 mV div 19 9 mV div DC 500 MHz Analog Bandwidth DC 1M W Coupled with P6139A Probe and Bandwidth elec i i U Volts Div as Read Out on Screen 520B 540B ...

Страница 128: ...0 20 sample interval 100 ppm Reading 0 05 Wi TDS 600B example at 5 GS s 5 ns div measuring a 40 ns wide pulse accuracy 40 ps 4 ps 5 ps 49 ps TDS 500B 700A 0 15 sample interval 25 ppm Reading t div 1000 TDS 500B 700A example at 4 Gs s accuracy 37 5 ps Conditions for accuracy listed at right are 100 Averages will Full Band width selected and for TDS 500B 700A repetitive mode TDS 600B 10 ps 100 ppm R...

Страница 129: ...width Limited 250 MHz Frequency Limit Upper 20 MHz Bandwidth Limited 20 MHz Step Response Settling Errors l i Se i S ep Ampli e Settling Error 3 at Volts Div Setting Step Amplitude 20 ns 100 ns 20 ms 1 mV div 100 mV div 2 V 0 5 0 2 0 1 101 mV div 1 V div 20 V 1 0 0 5 0 2 1 01 V div 10 V div 200 V 1 0 0 5 0 2 1 The limits given are for the ambient temperature range of 0_C to 30_C Reduce the upper b...

Страница 130: ...Coupled3 Trigger Source Typical Signal Level for Stable Triggering AC Noise Reject High Frequency Reject Low Frequency Reject Same as the DC coupled limits for frequen cies above 60 Hz Attenuates signals below 60 Hz Three times the DC coupled limits One and one half times the DC coupled limits from DC to 30 kHz Attenuates signals above 30 kHz One and one half times the DC coupled limits for freque...

Страница 131: ...B without any trigger spec deterioration Triggering will continue down to 0 dB with some performance deterioration 1 The trigger position errors are typically less than the values given here These values are for triggering signals having a slew rate at the trigger point of 0 5 division ns 2 The waveform interval WI is the time between the samples in the waveform record Also see the footnote for th...

Страница 132: ...table counting of events is counting that misses no events 7 For Logic time between channels refers to the length of time a logic state derived from more than one channel must exist to be recognized For Events the time is the minimum time between a main and delayed event that will be recognized if more than one channel is used 8 For Slew Rate Triggering this is the minimum transition time defined ...

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