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HP4402.book : chapter2.fm 58 Wed Apr 23 15:29:05 1997
Power Meter Operation
Contacting Hewlett-Packard
2-58 HP EPM-442A User’s Guide
Check the Basics
Problems can be solved by repeating what was being performed when the
problem occurred. A few minutes spent in performing these simple checks
may eliminate time spent waiting for instrument repair. Before calling
Hewlett-Packard or returning the power meter for service, please make
the following checks:
• Check that the line socket has power.
• Check that the power meter is plugged into the proper ac power
source.
• Check that the power meter is switched on.
• Check that the line fuse is in working condition.
• Check that the other equipment, cables, and connectors are
connected properly and operating correctly.
• Check the equipment settings in the procedure that was being
used when the problem occurred.
• Check that the test being performed and the expected results are
within the specifications and capabilities of the power meter.
• Check the power meter display for error messages. Refer to
Chapter 4 for further information.
• Check operation by performing the self tests.
• Check with a different power sensor.
Instrument serial numbers
Hewlett-Packard makes frequent improvements to its products to enhance
their performance, usability and reliability. Hewlett-Packard service
personnel have access to complete records of design changes for each
instrument, based on the instruments’ serial number and option
designation.