Agilent Technologies 54624A, 54621D, 54622D, 54622A If the trace display is unusual or unexpected

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.

5-4