Technical data

Troubleshooting 4
4000 X-Series Oscilloscopes Service Guide 73
If there is no trace display
✔ Check that the Intensity (on the front panel) is adjusted
correctly.
✔ Recall the default setup by pressing [Default Setup]. This
will ensure that the trigger mode is Auto.
✔ Check that the probe clips are securely connected to
points in the circuit under test, and that the ground is
connected.
✔ Check that the circuit under test is powered on.
✔ Press the [AutoScale] key.
✔ Obtain service from Agilent Technologies, if necessary.
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.