Keysight N9915-90020 User’s Guide 187
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
SA Mode Settings
— Source Power Sets the source power level. Choose from:
— Leveled Enter a value from –60 dBm to 10 dBm using the numeric
keypad, arrows, or the rotary knob
1
. The source power is
reasonably flat across the frequency span.
—
MAX The power level is set to the maximum achievable power level at
each frequency. This results in the power level NOT being flat across
the frequency span.
— Source CW Freq Sets the CW frequency that is used when Source Mode is
set to CW.
To cause the source to stay ON at the end of each sweep, turn battery saver
OFF. (Learn more in “How to Access Individual Alignments” on page 210.)
—Press System 7
> Preferences > Preferences then
— In the table, select Battery Saver. Press
Edit then Battery Saver ON OFF
To suspend InstAlign: (Learn more in
“How to Access Individual
Alignments” on page 210.)
—Press Cal 5
—Then
Amptd Alignment OFF
Resolution Bandwidth (Res BW)
In SA 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. However, as the
Res BW is narrowed, the sweep speed becomes slower. See
“Very Long Sweep
Times” on page 195
.
How to set Res BW
1. Press BW 2
> Res BW.
2. Then choose from the following:
—
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.
1. N995xC/6xC cannot have the Leveled value set lower than –35 dBm.
By default, the source output will turn off momentarily at the end of each
IQA and SA sweep and also every 300 seconds during the InstAlign
process.
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