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88 Chapter 1
Instrument Messages
Instrument Messages
Instrument Messages
Status DC Coupled
Indicates the input of the analyzer is DC coupled (
Input/Output, Coupling
(DC)
). This setting is necessary when measuring frequencies below 100
kHz on E4402B with Option UKB, E4404B, and E4405B analyzers. For
E4407B analyzers with Option UKB, you must set the coupling to DC
when measuring below 10 MHz. Take care to limit the input level to 0 Vdc
and +30 dBm whenever you are in DC coupled mode.
Status Demod ON: reduce span for audible detection
When the Demod function is active and the speaker is turned on, the ratio
of the resolution bandwidth to span must be greater than 0.002 to properly
demodulate and listen to the resulting audio signal. You must decrease the
span to continue the measurement
Status Ext Ref (no corresponding status bit)
The instrument’s frequency reference has been set to
External Reference.
This message will appear even if an external reference is not connected to
the instrument. The external reference frequency must also be entered.
Indicates that the frequency reference is being supplied by an external
10 MHz source.
Status External LO frequency out of range
One or more external LO frequencies are out of range. Check that the LO
frequency limits are set correctly and check the entered measurement
frequencies and measurement mode.
Status Final IF Overload (IF/ADC Overrange)
The final IF section has been overloaded. Measurement results may be
invalid. Either increase the input attenuation or decrease the input signal
level.
Status First IF Overload (IF/ADC Overrange)
The first IF section has been overloaded. Measurement results may be
invalid. Either increase the input attenuation or decrease the input level.
Status Flat corr off (no corresponding status bit)
Indicates that the flatness corrections have been turned off.
Status (FM Demod Align Failure) status bit only, no message
A failure has occurred during the FM Demod alignment. Measurement
results may be invalid.
Status Freq corr off (no corresponding status bit)
Indicates that the frequency corrections have been manually disabled.
Press
System, Alignments, Freq Correct, (On) to restore.