Troubleshooting 4
5000 Series Oscilloscopes Service Guide 59
✔ 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.
You may have pressed the AutoScale key before an input
signal was available.
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