Features and Functions 3
Keysight 34420A User’s Guide 105
Self-Test
A power-on self-test occurs automatically when you turn on the multimeter. This
limited test assures you that the meter is operational. This self-test does not
perform the extensive set of tests that are included as part of the complete
self-test described below.
A complete self-test runs a series of tests and takes approximately 15 seconds to
execute. If all tests pass, you can have a high confidence that the meter is
operational.
– The results of the complete self-test are stored in internal reading memory
(see page 62). Memory is cleared as the self-test stores this information. Other
than clearing memory, the complete self-test does not alter the state of the
meter.
– If the complete self-test is successful, “PASS” is displayed on the front panel. If
the self-test fails, “FAIL” is displayed and the ERROR annunciator turns on. See
the 34420A Service Guide for instructions on returning the meter to Keysight
for service.
– Front Panel operation: You can perform some of the tests individually or you
can perform all tests together at once. Scroll through the parameters under
the 4: TEST command in the SYStem menu.
Another way to perform the complete self-test from the front panel is as
follows: Hold down as you press the Power switch to turn on the meter;
hold down the key for more than 5 seconds. The self-test will begin when you
release the key.
– Remote operation: use the following command to initiate a self-test and
return the results:
*TST?
Returns “0” if the self-test is successful, or “1” if it fails.
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