LeCroy AP034, Instruction Manual

Page: 51 / 76

AP034-OM-E Rev D ISSUED: January 2000
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INTRODUCTION
You can use this procedure to adjust the AP034 Active
Differential Probe to meet the warranted specifications. This
procedure should only be performed if the instrument fails the
Performance Verification tests.
If the probe cannot be adjusted to meet the Performance
Verification limits, repair may be necessary.
To ensure instrument accuracy, check the calibration of the
AP034 Active Differential Probe every year. Before calibration,
thoroughly clean and inspect this unit as discussed in the
“Cleaning” section.
Completion of each step in the Adjustment Procedure ensures
that the differential probe meets specifications. Some of the
adjustments interact with other parts of the circuitry. Therefore, it
is necessary that all adjustments be performed in the order listed.
For best overall instrument performance, make each adjustment
to the exact setting, even when adjustment is within the limits
stated in the procedure.
Adequate guard bands were designed into the AP034 Active
Differential Probe to ensure that it will meet or exceed published
specifications over the entire operating temperature range. To
continue to meet the environmental specifications, all
adjustments must be performed in a controlled environment with
an ambient temperature of 25
±
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Differential Probe must also be at stable operating temperature
before performing adjustments.
Caution
The adjustment procedure will require removal of
the probe covers. These covers are part of the
ESD protection system of the AP034 Active
Differential Probe. To protect the probe, you
should perform the entire procedure on a static
dissipating work surface. Wear an antistatic