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HP4402.book : chapter2.fm 52 Wed Apr 23 15:29:05 1997
Power Meter Operation
Self Test
2-52 HP EPM-442A User’s Guide
Instrument Self Test
If is selected, the following tests are run, these
are the same tests which are run using the *TST? command.
• ROM checksum
• RAM
• Battery
• Display Assembly
• Calibrator
• Measurement Assemblies
As each test takes place, the name of the test is listed on the screen. While
a test is running, the message “Testing...” appears next to the name of
the test. As each stage of the test is completed, the message
“Testing...” is replaced by either the message “Passed” or “Failed”.
Confidence Check
The confidence check requires you to carry out the following procedure.
Instructions are also displayed on the screen. The confidence check can be
carried out on both channels using the appropriate softkeys.
1. Connect the power sensor to the POWER REF output (Refer to
Table 2-1 on page 2-7 for connection requirements for the HP 8480
series power sensors). The power reference signal is turned on
automatically after any key is pressed.
2. The power meter automatically makes a power measurement. If
the measured error is within the instrument accuracy
specification the confidence check has been successful.
While the test is running, the message “Testing...” appears. If
the correct power meter reading is made the message “Passed” is
displayed, otherwise “Failed” is displayed.
If the confidence check fails, the failure appears in the HP-IB error queue.
To examine the HP-IB error queue go to the “Errors” screen (refer to
Chapter 4).
Instrument Self Test