152 Keysight N9915-90020 User’s Guide
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
SA Mode Settings
— Then choose from the following:
—Center and Freq Span frequencies. This is the most common method
of entering frequency range. Enter the frequency of interest. The
Center frequency is at the exact center of the X-axis. The Frequency
Span places half of the frequency range on either side of center.
When the Center and Frequency Span values are entered, then the
X-axis annotation on the screen shows the Center and Span
frequencies.
—Start and Stop frequencies. Start is the beginning of the X-axis and
Stop is the end of the X-axis. When the Start and Stop frequencies
are entered, then the X-axis annotation on the screen shows the Start
and Stop frequencies.
— Follow each of these by entering a value using the numeric keypad, the
arrows , or the rotary knob.
— When using the arrows , press Enter
. The increment setting of the
arrows is based on the current span. This can be changed in SA Mode. See
“How to change frequency step size” on page 153 below.
— After using the keypad, select a multiplier key. Learn more in
“Multiplier
Abbreviations” on page 46.
Two more ways to change the frequency range
—Press Freq/Dist
— Then choose from the following:
—Zero/Last Span Each key press toggles the frequency span between
0 Hz and the last specified frequency span. Learn more about Zero
Span in
“Zero Span Measurements” on page 195.
—
More
—Then Full Span Selects the entire frequency span of the FieldFox. The
Center frequency is set automatically.
Integration BW (IBW) is coupled to the Frequency Span setting. Frequency
Span is 50% wider than the IBW (e.g., if the IBW value is 1 MHz, then the
Frequency Span value is 1.5 MHz).
Integration BW (IBW) is coupled to the Frequency Span setting. Frequency
Span is 50% wider than the IBW (e.g., if the IBW value is 1 MHz, then the
Frequency Span value is 1.5 MHz).
When in full span, ADC dither raises the noise floor at the edges of the
120 MHz.
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