SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
Audio Demod ON and OFF
To quickly stop the audio demodulation and perform only the normal SA
sweeps, select the following:
—Press Meas Setup 4
> Audio Demod ON OFF > OFF
Setting the Marker Counter Precision Softkey
When AM Tune & Listen, FM (narrow) Tune & Listen, or FM (wide) Tune &
Listen are selected, you can choose from the following:
—Press Marker
> Peak
—Press Mkr->/Tools > More > Mkr Properties > Counter Precision – Sets the
AM or FM Metric demodulated signal’s marker precision (.1 Hz, 1 Hz, 10 Hz;
default = 0.1 Hz).
The Counter Precision softkey is not available when AM Metric or FM Metric
are enabled. See also, “Setting the Mkr->TuneFreq Softkey” on page 167.
Setting the Mkr->TuneFreq Softkey
When AM Tune & Listen, FM (narrow) Tune & Listen, or FM (wide) Tune &
Listen are selected, you can choose from the following:
—Press Marker
> Normal
—Press Mkr->/Tools > Mkr->TuneFreq – The Tune & Listen Frequency
becomes the frequency of the active marker (When AM Metrics or FM
Metrics are selected this softkey is inactive).
See also, Chapter 28 Data Analysis and “How to use Marker Functions” on
page 659.
Analog Demod (Requires CPU2)
The Tune & Listen feature can be used to identify an interfering AM or FM
signal. Also, AM/FM Metrics displays the demodulated signal and the audio
frequency spectrum.
The demodulated AM or FM signal can be heard through the internal speaker
or through headphones using the 3.5 mm jack located on the FieldFox side
panel.
The Analog Demod spectrum is displayed alongside the SA displayed trace.
This enables you to listen and display a carrier frequency and it’s harmonics.
The Analog Demod measurement displays a normal SA sweeps for the display
while performing audio demodulation at the carrier Frequency. See the “How
to select Analog Demod (Metrics)” on page 169 setting for more information.
Keysight N9938-90003 User's Guide
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