Adjustments
Introduction
3-2 HP EPM-441A/442A Service Guide
Introduction
This chapter describes adjustments and checks which ensure proper
performance of the power meter. Adjustments are not normally required
on any fixed periodic basis, and normally are performed only after a
performance test has indicated that some parameters are out of
specification. Performance tests should be completed after any repairs
that may have altered the characteristics of the power meter. The test
results will make it possible to determine if adjustments are required.
Allow 30 minutes for the power meter to warm up, and then remove the
cover, for access to the test and adjustment points.
To determine which performance tests and adjustments to perform after a
repair, see “Post-Repair Adjustments”, on page 3-3.
Safety Considerations
This warning must be followed for your protection and to avoid damage to
the equipment being used.
WARNING Adjustments described in this chapter are performed with
power applied to the instrument and with protective
covers removed. Maintenance should be performed only by
trained personnel who are aware of the hazards involved.
When the maintenance procedure can be performed
without power, the power should be removed.
4402serv.book Page 2 Monday, March 11, 2002 11:34 AM
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