Agilent Technologies InfiniiVision 7000 Series Service Manual page 67

7000 Series Oscilloscopes Service Guide
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 time/division is
set to slower speeds, the oscilloscope is sampling too
slowly to capture all of the transitions on the waveform.
Use peak detect mode.
Check that all oscilloscope probes are connected to the
correct signals in the circuit under test.
Ensure that the probe's ground lead is securely connected
to a ground point 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.
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.
If you cannot see a channel
Recall the default setup by pressing Save/Recall then
Default Setup. This will ensure that the trigger mode is
Auto.
Check that the oscilloscope probe's BNC connector is
securely attached to the oscilloscope's input connector.
Check that the probe clips are securely connected to
points in the circuit under test.
Check that the circuit under test is powered on.
Troubleshooting 4
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