260 Keysight N9915-90020 User’s Guide
RTSA (Real-time Spectrum Analyzer) Mode—Option 350
RTSA Mode Settings
How to set Frequency Range
—Press Freq/Dist
.
— 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.
— Optionally, press
More then:
——CF Step then type a step size value using the numeric keypad,
then select a multiplier key.
——Freq Annotation and one of the following:
——Full Span the frequency span changes the instrument’s full
frequency span (frequency span is model dependent).
— Follow each of these, when prompted, 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 RTSA Mode.
— After using the keypad, select a multiplier key. Learn more in
“Multiplier
Abbreviations” on page 46.
AutoSelect (Default) – The FieldFox selects a frequency annotation
setting (CenterSpan or StartStop).
CenterSpan -The center frequency and span are displayed.
StartStop - The start and stop frequencies of the frequency span are
displayed.
When in full span, ADC dither raises the noise floor at the edges of the
120 MHz.
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