Turn Off Either Am Or Fm Settings; Squelch Interrupt Overflow; Cal File Checksum Incorrect - Initializing File; Decoder Buffer Full - HP 8921A User Manual

Error Messages
560

Turn off either AM or FM settings.

You tried to create simultaneous AM and FM (using any combination of AFGen1,
AFGen2, and the Mod In To field). The Test Set does not provide simultaneous AM
and FM.
Squelch interrupt overflow. Press MEAS RESET.
The Test Set temporarily interrupts audio measurements when squelch is first broken to
prevent internal switching transients from influencing measurements (except when using
the OSCILLOSCOPE, SPECTRUM ANALYZER, DECODER, or SERVICE screens). If
squelch is repetitively broken in a period of a few seconds, the duration of measurement
interruption becomes too great, and the Test Set stops interrupting the signal. Following
measurements may be influenced by transient signals.
Pressing [MEAS RESET] clears the data buffer used to generate interrupts, resetting the
normal squelch operation to eliminate transients.
This condition may occur when monitoring low-level off-the-air signals.

Cal file checksum incorrect - initializing file.

This error usually occurs after changing the Test Set's firmware ROM's. It is not a
problem in that instance, but should not re-appear during subsequent operation of the Test
Set.
Decoder buffer full. Decrease gate time.
Too many decoder samples were sent to the decoder's buffer during a measurement gate
time causing a data overflow. Reducing the gate time decreases the amount of data sent
during each measurement.