68 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Self Test
Multiple Failures
Multiple Failures
If more than one test result falls outside the limits, the Self Test routine
evaluates the failures and reports the most likely cause of the failure. This can
best be understood by using the following hypothetical example:
— There are three functional blocks in a series. A1 is the first block, A2 the
second block, and A3 the third block. A1’s output is the input for A2, and
A2’s output is the input for A3.
— If A1 is defective, A2 and A3 may also appear defective. Or, if A2 is
defective, A3 may also appear defective.
— If A1, A2, and A3 all fail their Self Test the instrument will report the most
likely cause of the failure as being the A1 functional block.
— If only A2 and A3 fail their Self Test the instrument will report the most likely
cause of the failure as being the A2 functional block.
The instrument contains this dependency information that it uses to identify
the most likely failure when there are multiple Self Test failures.
If two independent failures occur, Self Test reports only one root failure at a
time and reports the second failure after the first reported failure is repaired
and the Self Test is run again. However, all tests that fail will be reported under
the View Test Info screen.
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