Agilent Technologies 54845B Manual page 60

Chapter 3: Testing Performance
To test time measurement accuracy
Clear measurements.
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Select Period from the Time submenu of the Measure menu.
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Period should be the following.
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For Agilent 54845B and 54846B: 39.50 ns ± 28 ps, minimum 39.47 ns, maximum 39.53
ns. Record the minimum and maximum readings in the Performance Test Record.
Select Delta Time from the Time submenu of the Measure menu.
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Delta time should read the following:
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For Agilent 54845B and 54846B: 395 ns ± 53 ps, minimum 394.947 ns, maximum 395.053
ns. Record the minimum and maximum readings in the Performance Test Record.
Press the Stop key on the front panel.
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Press the Sweep key (in the Trigger section of the front panel) to highlight the LED
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labeled "Single."
Press the Clear Display key.
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Set the timebase to 1 µs/div.
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Press the Run key once.
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Select Measurement Definitions from the Customize submenu of the Measure menu.
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(If you have code Revision A.03.00 or higher, select Delta Time from the Measurements
Definitions submenu of the Measure menu.)
Set the To Edge # to 101 with Direction Rising and Threshold Middle. Click Close.
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Delta time mean should read the following:
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For Agilent 54845B and 54846B: 3.94999 µs ± 301 ps, minimum 3.949688 µs, maximum
3.950291 µs. Record the reading in the Performance Test Record.
Select Measurement Definitions from the Customize submenu of the Measure menu.
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(If you have code Revision A.03.00 or higher, select Delta Time from the Measurements
Definitions submenu of the Measure menu.)
Set the To Edge # to 201. Click Close.
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The Delta Time mean should read the following:
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For Agilent 54845B and 54846B: 7.89999 µs ± 578 ps, minimum 7.89942 µs and maximum
7.90058 µs. Record the reading in the Performance Test Record.
Click Close.
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If the test fails
Before troubleshooting the oscilloscope, be sure to verify your test setup and the waveform shape, then
repeat the procedure. Try the measurement on different channels. If you still encounter problems, there
may be a problem with the acquisition board. You may need to adjust the pulse overshoot response. See
chapter 4 for adjustment information on the pulse response. See chapter 5 for troubleshooting information.
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