HP ESA-E Series Programmer's Manual page 371

Error Messages
Status Messages
measure properly. To remove the message, remove the
50 MHz input signal, then perform an
Press
connect 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.
Input is internal (no corresponding status
bit)
This message applies to the HP E4401B and
E4411B only. Indicates the
is
On
input is routed through an internal signal path.
7-4
, ,
System Alignments
AMPTD REF OUT
. With the 50 MHz amplitude reference on, the
Align Now
, . Be sure to
Align Now RF
to the with the
INPUT
selection
50 MHz Amptd Ref
Chapter 7
, .
RF