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 50). 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 Hewlett-Packard 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
Shift 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.
3
Chapter 3 Features and Functions
System-Related Operations
93
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