User's Manual
Table Of Contents
- Title page
- Contents
- 1 General Information
- 2 Preparing the Oscilloscope for Use
- 3 Testing Performance
- List of Test Equipment
- To construct the test connector
- To test the 54621D/22D Oscilloscope digital channels
- To verify digital channel threshold accuracy
- To verify voltage measurement accuracy
- To verify bandwidth
- To verify horizontal Dt and 1/Dt accuracy
- To verify trigger sensitivity
- Agilent 54622A/22D/24A Performance Test Record
- Agilent 54621A/21D Performance Test Record
- 4 Calibrating and Adjusting
- 5 Troubleshooting
- 6 Replacing Assemblies
- 7 Replaceable Parts
- Declaration of Conformity
- Notices
5-4
Troubleshooting
If the trace display is unusual or unexpected
If the trace display is unusual or unexpected
❏ Check that the Horizontal time/division setting is correct for the expected
frequency range of the input signals.
❏ The sampling speed of the oscilloscope depends on the time/division setting.
It may be that when the time/division setting is slower than 1 ms/div, the
oscilloscope is sampling too slowly to capture all of the transitions on the
waveform.
❏ Check that all oscilloscope probes are connected to the correct signals in the
circuit under test.
❏ Check to see that the ground lead on the cable is securely connected to ground
in the circuit under test. For high-speed measurements, each probe’s individual
ground lead should also be connected to a ground point closest to the signal
point in the circuit under test.
❏ Use chapter 2 for information on probing considerations.
❏ Check that the trigger setup is correct.
❏ A correct trigger setup is the most important factor in helping you capture the
data you desire. See the User’s Guide for information about triggering.
❏ Check that infinite persistence in the Display menu is turned off, then press
the Clear Display softkey.
❏ Press the Autoscale key.
service.book Page 4 Wednesday, December 18, 2002 8:35 AM