Keysight Technologies FieldFox A Series, User Manual

Page: 228 / 756

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.