One Or More Self Tests Failed; Change Ref Level, Input Port Or Attenuator; Change Rf Gen Amplitude, Output Port Or Atten Hold; Direct Latch Write Occurred - HP 8921A User Manual

Error Messages
One or more self tests failed. Error code: XXXX
An instrument failure was detected when the Test Set was turned on. (For example, having
a stuck front-panel key during turn on.) The numbered error message corresponds to a
binary-weighted group of errors listed in the *TST Common Command description in the
Programmer's Guide.
Change Ref Level, Input Port or Attenuator (if using "Hold").
The RF signal level is either too great or too small for the current input port, attenuator
setting, or both. This error often occurs when trying to make a low-level measurement
using the RF IN/OUT port with the Spectrum Analyzer. Make the indicated changes until
this message is no longer displayed.
Change RF Gen Amplitude, Output Port or Atten Hold (if on).
This message appears when the RF Generator's Amplitude field is set too high when
using the RF IN/OUT port or when adjusting the amplitude with the Atten Hold field
set to On.
The RF IN/OUT port has a lower maximum output level than the DUPLEX OUT port.
Use the DUPLEX OUT port, or reduce the RF Generator's level.
If Atten Hold is On, you may be adjusting the amplitude outside of the allowed range.
Change the amplitude
Direct latch write occurred. Cycle power when done servicing.
The SERVICE screen was accessed and one or more internal latch settings were changed.
Turn the instrument off and back on to reset the latches. (This condition can occur during
periodic calibration.)
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