HP EPM E4419A, EPM-442A manual 88

System Inputs

Power Meter Operation

Self Test

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 2-53.

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 Assemblies

Refer to “Test Descriptions”, on page 2-54 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 , More , Error List .

2-50 HP EPM-442A User’s Guide