7
Safety Considerations
WARNING Before you disassemble the signal generator, turn the power switch off and unplug the
power cord. Failure to unplug the signal generator can result in personal injury.
CAUTION Electrostatic discharge (ESD) can damage or destroy electronic components. All work on
electronic assemblies should be performed at a static-safe workstation.
Check Signal Generator Functionality
Use the following procedure to confirm that the signal generator powers up and the internal check identifies no errors. The
internal check evaluates the operation of the signal generator and returns an error message if it detects a problem.
NOTE When the signal generator is first connected to ac line power, the error message
ERROR 514, Reference Oven Cold occurs, which causes both the OVEN COLD annunciator and the
ERR annunciator to turn on.
After approximately five minutes, the OVEN COLD annunciator automatically clears, but the ERR
annunciator remains on until all errors are cleared from the error queue.
1. Turn on the signal generator and let it warm up for at least five minutes.
2. Run the signal generator self-test by pressing
Utility > Instrument Info/Help Mode > Self Test > Run Complete Self
Test
. Upon completion, a summary of the self-test will be displayed. Use the E8257D/67D PSG Service Guide,
E8251-90359, to troubleshoot any failures detected by the test.
NOTE Some circuits may require up to 50 minutes to warm up before passing the self-test. If self-tests continue to
fail after 50 minutes of warm up, troubleshoot the instrument.
3. Check to see if the ERR annunciator is on.
•If the ERR annunciator is on, review the error messages in the error queue by pressing
Utility > Error Info. The first page of error messages in the error queue appears in the display text area. (Refer to the
signal generator error messages document for information about each error message.)
After resolving all problems causing errors, press
Clear Error Queue(s).
•If the ERR annunciator is off, the signal generator functionality check has passed.
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