HP EPM E4418A, User Manual

Page: 89 / 158

HP4402.book : chapter2.fm 49 Tue Apr 22 15:20:23 1997
Power Meter Operation
Self Test
HP EPM-441A User’s Guide 2-49
HP-IB Testing
To invoke the HP-IB self test, the IEEE 488.1 compliant standard
command,
*TST?
is used. This command runs a full self test and returns
one of the following codes:
• 0 - no tests failed
• 1 - one or more tests failed
The HP-IB self test consists of the following tests:
• ROM checksum
• RAM
• Battery
• Display Assembly
• Calibrator
• Measurement Assembly
• Communications Assembly (Implicit)
The communications assembly is tested implicitly, in that the command
will not be accepted or return a result unless the HP-IB interface is
functioning correctly.
Refer to “Test Descriptions”, on page 2-50 if you require a description of
each individual test.
When the
*TST?
command is executed, the screen is cleared. 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
”.