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Offset Will Not Zero
With no signal input and no offset setting, the dc output of the probe should
be within 1 mV. An error can be caused by several factors.
• If the probe is connected to an 54700 family oscilloscope for probe power,
the oscilloscope will calibrate out an offset zero error during a probe
calibration. If the offset error can not be calibrated out, the probe
calibration will fail. Check the offset zero before continuing (see "To
Adjust Offset Zero" in this chapter). If the probe cannot be adjusted,
return it to Agilent for repair.
• If the probe is connected to an 1143A power module for probe power, lack
of zero can be caused by misadjustment of the probe or a residual offset
current from the power module (see "To adjust offset zero" in this chapter
and "To adjust offset zero" in chapter 2 of the 1143A User and Service
Guide).
To prepare the probe for exchange
If your probe is out of warranty and you want to exchange your failed probe
for a reconditioned probe, you need to keep the cover plate that holds the
probe serial number. The reconditioned probe will not have a serial number.
When you receive the reconditioned probe, put your cover plate with serial
number on the reconditioned probe.
Use the following procedure to remove or replace the cover plate.
1 With a #10 Torx screwdriver, remove the two screws at the "N"
connector end of the probe power housing.
2 Slide the end plate aside and slide the cover off the power housing.
3 To protect the cabling, use the two screws to re-fasten the end plate to
the housing.
4 Reverse the procedure to fit your serial plate to the probe power
housing of the reconditioned probe.
5 For return instructions,see "To return the probe to for service" on
page 40.
The exchange part number is listen in table 8, "Replaceable Parts" on page 54.
Chapter 3: Service
Troubleshooting and Repair
53
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