Keysight Technologies FieldFox A Series User Manual page 222

SA (Spectrum Analyzer) Mode
Spectrum Emission Mask (SEM) — (SA Mode Only)
3. Setting Center Frequency and Span
Frequency control menu (Center and Span) provides an SEM Auto Span
control (defaulted to ON) which automatically tracks the necessary span to
cover all enabled offset segments. In the example in
page
span simply by narrowing or widening Span it in order to zoom.
The Carrier Frequency (Ref Channel Center) by default tracks the specified
Center Frequency, but can be forced to "Hold" at a particular location
which would then allow the user Center Frequency to pan above or below
for reasons similar to zooming with span.
222
— Ofst Enable
Frequency Start/Stop Offset values.
— Ofst Freq Start
(Default/Maximum = Value varies with model and options,
Minimum = 0 Hz).
— Ofst Freq Stop
(Default/Maximum = Value varies with model and options,
Minimum = 0 Hz).
— Res BW
resolution bandwidth value. See also,
Bandwidth (Res BW)" on page
— Offset Side Neg Both Pos
side measurement value. Select Negative (Neg) to
measure the negative side of the spectrum. Select Positive
to measure the positive side of the spectrum.
— Offset Freq Def
— Carrier Center
the current carrier center frequency.
— Carrier Edge
offset definition.
— Power Ref – the reference power value can be fixed (which also
fixes the Relative Limit line), but the user must then consider the
unit being used (dBm or dBm/Hz) depending on the Meas Type
selected. If Power Ref is left AUTO (Default) then its value will track
the Meas Type and change units automatically. Both fixed and Auto
settings display the power reference value measured.
220, the necessary span is 16 MHz. But the you can de-couple the
Press Freq/Dist then
— Center - sets the center frequency.
— SEM Auto Span
— Freq Span - sets the frequency span of the SEM measurement.
Enables/disables the currently selected
Sets the offset frequency start value.
Sets the offset frequency stop value.
Auto/Manual (Default is Auto). Sets the current
(Default is Both). Sets the offset
then select one of the following:
(Default) applies the frequency offsets to
Selects the edge of the carrier for frequency
- Enables/disables the SEM Auto Span.
Keysight N9927-90001 User's Guide
"Resolution
165.
Figure 9-18 on