HP4402.book : chapter2.fm 46 Tue Apr 22 15:20:23 1997
Power Meter Operation
Self Test
2-46 HP EPM-441A User’s Guide
Self Test
The power meter has three distinct self test modes:
• power on self test, which occurs automatically when you turn on
the power meter.
• confidence check, which is accessed via the front panel and
requires your assistance in order to verify the POWER REF and
measurement path accuracy.
• troubleshooting mode, which is accessed via the front panel or
remotely over the HP-IB. The front panel softkey menu allows you
to run individual tests, whereas the HP-IB command runs a
complete series of tests as listed in “HP-IB Testing”, on page 2-49.
Power On Self Test
The power on self test is performed automatically when the power meter
is turned on and takes approximately 10 seconds to complete. The power
on self test consists of the following tests:
• Battery
• Calibrator
• Measurement Assembly
Refer to “Test Descriptions”, on page 2-50 if you require a description of
each individual test.
As the power on self test takes place, the message “Testing...” appears
next to the name of the test which is being performed. When each test is
complete, the message “Testing...” is replaced by either the message
“Passed” or “Failed”. If a failure occurs the message “Power-up H/W
Err” appears. Any errors are also written to the HP-IB error queue and
can be examined in the “Errors” screen by pressing , ,
.
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