228 Keysight N9927-90001 User’s Guide
RTSA (Real-Time Spectrum Analyzer) Mode—Option 350 (CPU2 Only)
RTSA Mode Settings
—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 to 10 MHz.
— 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 43.
Scale and Units
Adjust the Y-axis scale to see the relevant portions of the data trace.
The Y-axis is divided into 10 graticules. A acquisition is shown on the screen as
a solid horizontal bar that can be placed at any graticule.
RTSA always uses logarithmic scale. The Y-axis reference line represents the
specified absolute acquisition (dBm). Y-axis graticules show dB below or above
the reference line.
When RF Attenuation set to Auto, the RF Attenuation is coupled to acquisition.
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.
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