94 Keysight NFA Series Noise Figure Analyzers Service Guide
Instrument Messages
Event Messages
–221 Settings conflict;
Sweep Time cannot be
set while in FFT
sweeps
The sweep time for FFT sweeps is set by the calculations. It cannot be
manually controlled
–221 Settings conflict;
Swept IF Gain High
not available when
FFT IF Gain = Manual
Low
When FFT IF Gain is manually set to Low, you cannot set the Swept IF Gain to
High because that would make the Reference Level couplings wrong in
swept mode
–221 Settings conflict;
Swept LO not
available when freq
mode is Fixed
SCPI only message. The LO Mode cannot be set to Swept when the freq
mode is set to fixed. Change the freq mode away from fixed, or perform the
measurement at several fixed frequencies
–221 Settings conflict;
Swept Type=Swept is
not available while
in Gated FFT
If you have selected gated FFT then you are using the FFT sweep type and
you cannot select the swept type of sweeping
–221 Settings conflict;
System Display
Settings, Annotation
is Off
This is an override that turns off many of the annotations. This is available as a
security feature
–221 Settings conflict; T
hot must be greater
than T cold
The Tcold value set under
Meas Setup, ENR, Tcold needs to be lower
than the Thot value currently being set. Tcold is often taken as the ambient
temperature of the noise source. If using an SNS the Tcold value may be read
automatically before every sweep
–221 Settings Conflict;
The parameter cannot
be changed in FAST
mode
–221 Settings conflict;
Trace Math is not
available while
Normalize is on
The Normalize function works by doing trace manipulation, so trace math is
not available while normalization is running
–221 Settings conflict;
Tracking Source
unavailable in FFT
Sweeps
Since FFTs do not sweep, you cannot use a Tracking Source while doing FFTs
–221 Settings conflict;
Trigger input in use
for source
synchronization
If Point Trigger is being used with an external trigger input to synchronize an
external source to the analyzer, that trigger input is unavailable for triggering
Err# Message Verbose/Correction Information
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