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RTSA (Real-time Spectrum Analyzer) Mode—Option 350
RTSA Mode Settings
Setting the IF Path
How to check or set the IF Path. By default the IF Path is set to Auto.
— Press BW 2.
— Then
When in full span, ADC dither raises the noise floor at the edges of the
120 MHz.
Resolution Bandwidth (Res BW)
In RTSA Mode, the Res BW provides the ability to resolve, or see closely
spaced signals. The narrower (lower) the Res BW, the better the spectrum
analyzer can resolve signals. In addition, as the Res BW is narrowed, less noise
is measured by the spectrum analyzer ADC and the noise floor on the display
lowers as a result. This allows low level signals to be seen and measured.
How to set Res BW
— Press BW 2.
— Then
— Then choose from the following:
Keysight N9938-90006 User's Guide
IF Path
The underlined setting is the current setting. Choose Auto,
10
MHz, or
100 MHz
Optional: After you click 100 MHz, you can use the Freq/Dist hard key and
the number pad or using the numeric keypad, the
your IF path bandwidth to 120 MHz.
For best results, use the AUTO setting for the Res BW values. Increasing
the resolution BW could reduce pulse measurement capability by
affecting the 100% POI duration and the minimum detectable signal level.
The resolution BW must be as narrow as possible to maintain gapless
measurements.
When Manual RBW is selected, the FieldFox attempts to set the RBW to
the setting you request, but this setting is coupled to the current span
settings. If the manually set RBW is not settable with the current
frequency span value, the FieldFox defaults to the nearest achievable
RBW setting to meet the manual RBW value.
Res
BW.
—
Auto
Res BW is coupled to the frequency span. As the frequency
span is narrowed, the Res BW is also narrowed providing increased
ability to resolve signals.
To change this setting from Man to Auto, press Res BW twice.
(100 MHz requires Option B04 or B10).
arrows, to increase
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