Agilent Technologies 8935 Series, Руководство пользователя

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Appendix A 329
Error Messages
Self-Calibration Error Messages
Self-Calibration Error Messages
Voltmeter Self Calibration Failed. Error = 223, 0x0000ffff
(EXAMPLE)
The example noted above is one of many messages that may occur
during self-calibration. When the Test Set is powered up and at timed
intervals for certain measurements, the Test Set calibrates itself
internally. Calibration usually takes 20 to 30 ms. The following
measurements are calibrated at these timed intervals:
• Voltmeter: approximately every 3 minutes
• Counter: approximately every 3 minutes
• Oscilloscope: approximately every 3 minutes
• Spectrum Analyzer: approximately every 4 minutes
Should a self-calibration fail, an error message is displayed. The error
code (223, 0x0000ffff in the example above) will vary depending on the
particular failure. Failures of this type are generally caused by
hardware. Since a general self-calibration occurs immediately after
power-up, these failures often appear as though they are power-up
self-test errors.
When a self-calibration failure occurs, check the A2A33 Measurement
assembly first since most of the measurement circuitry described above
is located on it. However, in the case of the spectrum analyzer
calibration, check the A2A20 Spectrum Analyzer assembly first. The
A2A23 Reference assembly may also cause its own self-calibration
failure or a Spectrum Analyzer error message. (The error message in
the example above can be generated by unplugging the A2A23
Reference before powering up the Test Set.)
After displaying a self-calibration error message, the Test Set will
proceed with the measurement using default calibration factors.
Depending on the nature of the failure, subsequent measurements may
look normal. The error message will persist.