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Instrument Errors
501 to 502
501: Cross-isolation UART framing error
502: Cross-isolation UART overrun error
These errors indicate an internal hardware failure. The isolation between
chassis ground circuits and floating circuits is controlled by an optical
isolation barrier and a serial link.
Reference phase-locked loop is unlocked
580
The PHAS:UNL:ERR:STAT has been enabled ("on") and the internal
phase-locked loop that controls the frequency is currently unlocked.
This error is most likely to occur when the external reference is out of
lock range.
Chapter 5 Error Messages
Instrument Errors
4
5
305
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