Keysight N9915-90020 User’s Guide 153
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
SA Mode Settings
How to change frequency step size
When using the arrows to change any of the frequency settings, the size
of the frequency step can be changed.
—Press Freq/Dist
—Then More
—Then
CF Step Auto Manual
—Auto Each press of the arrows increments or decrements the
value by 1/10th (one division) of the current frequency span. Note: To
change this setting from Manual to Auto, press CF Step twice.
—
Manual Type a step size value using the numeric keypad, then select a
multiplier key. Learn more in
“Multiplier Abbreviations” on page 46.
How to change from Linear to Log Axis View
—Press Freq/Dist
> More
— Then choose from the following:
— Log Freq AxisX enables/disables the log frequency X-axis. Disabling
the log frequency X-axis, enables the linear frequency X-axis (Default
= OFF).
—
Full Span Selects the entire frequency span of the FieldFox. The
Center frequency is set automatically.
Baseband (N99xxC-Series FieldFox Models Only with Option 350
RTSA or Option 233 SA–Mixed Models)
The SA Receiver has a “Baseband” path, which provides improved sensitivity
(i.e., lower DANL), lower phase noise, and less LO Feedthru. The baseband
receiver path avoids analog mixing stages, and instead routes the SA input
signal (after RF Attenuation) more directly to an Analog to Digital
converter. There is no Preamp available in the baseband path. The baseband
path is available in both SA and RTSA modes.
The baseband path analyzes RF input frequencies up to 6.5 MHz only. When
used for RTSA or SA's IQ Analysis measurement, the baseband path is not
activated for spans >10MHz. The FieldFox C-Series RTSA and SA IQ Analysis
may still have wider IQ bandwidth capability, up to 120 MHz like all B models
(requires Option B04 (40 MHz) /B10 (100 MHz)). But, that wider IQ bandwidth
is not available in the baseband path.
When in full span, ADC dither raises the noise floor at the edges of the
120 MHz.
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