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Troubleshooting and Repair
This section provides information to determine if your probe needs
adjustment or repair.
• If your probe is under warranty and requires repair, returned it to. Contact
your nearest Service Center.
• If the failed probe is not under warranty, you may exchange it for a
reconditioned probe. See "To Prepare the Probe for Exchange" in this
chapter.
Failure Symptoms
The following symptoms may indicate a problem with the probe or the way it
is used. Possible remedies and repair strategies are included.
The most important troubleshooting technique is to try different combi-
nations of equipment so you can isolate the problem to a specific instrument.
Probe Calibration Fails
Probe calibration failure with an oscilloscope is usually caused by improper
setup. If the calibration will not pass, check the following:
• Be sure the instrument passes calibration without the probe.
• Check that the probe passes a signal with the correct amplitude.
• If the probe is powered by the oscilloscope, check that the offset is
approximately correct. The probe calibration cannot correct major
failures.
• If the probe is powered by an 1143A power module, be sure the offset is
set to Local and Zero during calibration.
Incorrect Frequency Response
Incorrect frequency response may be caused by a defective probe, plug-in or
oscilloscope mainframe, or an improper application such as poor connec- tions
or grounding etc. Read chapter 2, "Probing Considerations," in this guide. If
the application is correct, try the probe with another oscilloscope.
If the probe appears ac coupled at a high frequency, check for a loose probe
tip.
Chapter 3: Service
Troubleshooting and Repair
51
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