Common Measurement Settings
R&S
®
FSPN
114
User Manual 1179.4363.02 ─ 01
The point at which measurement results cannot be improved anymore is defined by the
"XCORR Optimization Threshold". The threshold is the distance between the
and the actual trace. When the distance between those two traces exceeds the
threshold in any given half decade, the R&S
FSPN stops measuring in this half decade
and resumes with the next one.
Example:
The number of operations in a half decade is 30. When optimization is on, and the
results do not improve any more after 20 operations, the application stops measure-
ments in that half decade.
You can also finish the measurement of a specific half decade manually with the "Fin-
ish Segment" softkey available in the "Sweep" menu. The R&S
FSPN resumes the
measurement of the next half decade in that case.
For offsets greater than 30
MHz, each half decade is divided into smaller segments.
For these offsets, the "Finish Segment" feature does not resume with the next half dec-
ade, but with the next offset segment.
Remote command:
Configuration mode:
XCORR number:
Optimization:
[SENSe:]SWEep:XOPTimize[:STATe]
Optimization threshold:
[SENSe:]SWEep:XOPTimize:THReshold
Turning the display of the cross-correlation gain indicator on and off
It shows the rejection of uncorrelated noise dependent on the number of correlation
averages. If the measurement trace itself lies on the cross-correlation gain indicator,
further correlation will reduce the phase noise value. If some distance between the
cross-correlation gain indicator and the measurement result is obtained, further corre-
lation will not reduce the phase noise value any more, but only smooth the trace. When
you turn on the
feature, the measurement stops automatically when
the gap between the cross-correlation gain indicator and the measurement trace
exceeds 10
dB.
You can turn the display of the gray area on and off as required.
Remote command:
Capture Range
The "Capture Range" defines the bandwidth with which the R&S
FSPN searches for a
signal or tracks drifting signals.
Use a "Normal" capture range for stable or slowly drifting DUTs. For fast drifting DUTs,
use a "Wide" capture range.
Use a "40 MHz" capture range to measure carriers swept from -40 MHz to +40 MHz
relative to the center frequency. Additional spurs and restrictions of the measurement
accuracy are possible for CW signals, or carriers swept in other frequency ranges. For
specifics of the measurement accuracy, refer to the data sheet.
Noise Measurement Configuration
