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Chapter 6 Service and Repair
Self-Test Procedures
6
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
subsystems are functioning properly.
Full Self-Test
The successful execution of the self-test procedure provides a high degree
of confidence that the waveform generator is operating normally. The
self-test procedure is an automated procedure that systematically
exercises the internal oscillator, digital infrastructure, waveform
memory, and the analog attenuator paths. The test procedure attempts
to isolate any failing conditions found to a particular assembly to
facilitate troubleshooting and repair. The test typically takes
approximately 15 seconds to complete.
During the test the waveform generator main output(s) are disconnected
internally from the BNC connectors and are connected to the internal
ADC. The ADC is used to check for expected signal levels through-out
the instrument. As the different signal paths are configured for testing,
the activation of the relays used to switch the signal paths is audible.
After the test procedure completes, the instrument is restored to the
state it was in before the full self-test was executed.
Self-test should be executed before beginning any of the verification or
adjustment procedures.
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