4-12 Chapter4
Troubleshooting
Status Messages
E4411B only: disconnect any signals from the INPUT
prior to performing this procedure.
Align RF Skipped (Align RF Skipped)
The RF alignment has been skipped because a 50 MHz
signal was detected at the INPUT; alignment will
resume when the 50 MHz signal is removed. The
alignment will not work when there is too much input
power at 50 MHz. The instrument may not continue to
measure properly. To remove the message, remove the
50 MHz input signal, then perform an
Align Now, RF.
Press
System, Alignments, Align Now, RF. Be sure to
connect the
AMPTD REF OUT to the INPUT with the
appropriate cable to perform the alignment.
Ext Ref (no corresponding status bit)
Indicates that the frequency reference is being supplied
by an external 10 MHz source.
Frequency Reference Error (Freq Ref Unlocked)
The frequency reference has been tuned too far off of
10 MHz. This condition may be corrected by cycling
power on the analyzer.
(FM Demod Align Failure) status bit only, no
message
A failure has occurred during the FM Demod
alignment. Measurement results may be invalid.
(IF Align Failure) status bit only, no message
A failure has occurred during the IF alignment.
Measurement results may be invalid.
IF Overload (IF/ADC Over Range)
The IF section has been overloaded. Measurement
results may be invalid.
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