Agilent Technologies 34980A Service Manual Page 20

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8 34980A Service Guide
1 Obtaining Service
Self Test Procedures
Power–On Self–Test
Each time the instrument is powered on, a subset of self–tests are
performed. These tests check that the minimum set of logic and output
hardware are functioning properly.
Complete Self–Test
To perform a complete self–test send the *TST? command.
This command performs a complete self- test of the instrument and all
installed plug- in modules and returns a pass/fail indication. The self- test
runs a series of tests and, depending upon the modules installed, may take
up to 2 minutes to complete (be sure to set an appropriate interface time
out). If all tests pass, you can have a high confidence that the instrument
and all installed plug- in modules are operational.
If the self–test is successful, SELF–TEST PASSED is displayed on the front
panel.
If the self–test fails, SELF–TEST FAILED is displayed and an error number
is shown. Self–test error numbers and their meaning are shown in the
table on page 85.
On the 34945A Microwave Switch/Attenuator Driver, this command
performs a self- test of the 34945A and all connected 34945EXT remote
modules.
If you have a 34951A Isolated DAC Module installed, the self- test
will require an additional 15 seconds to complete per DAC module
(a memory test is performed).
If one or more tests fail, return the instrument to Agilent for service.
Self Test Error Numbers
On the remote interface, a self–test failure will generate SCPI error –330
and a supplemental message indicating one of the test numbers shown in
the table on page 85.
Calibration Errors
The table on page 86 shows failures that may occur during a calibration.
NOTE
The self-test will abort if any signals are connected to ABus1 via the
rear-panel Analog Bus connector (pins 4, 5, and 9). Be sure to
disconnect any signals from ABus1 prior to running the self-test.
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