Noise Reduction - Keysight x-series User Reference Manual

Compatibility SCPI
Backwards Compatibility
SCPI Notes
Initial S/W Revision

Noise Reduction

Noise Reduction accesses a menu for configuring the noise compensation of the instrument. This menu
only appears in models that support Noise Reduction.
Key Path
Initial S/W Revision
Noise Floor Extension
Turns on the Noise Floor Extension function. When this function is On, the expected noise power of the
analyzer (derived from a factory calibration) is subtracted from the trace data. This will usually reduce the
apparent noise level by about 10 dB in low band, and 8 dB in high band (>~3.6 GHz).
Noise Floor Extension works with any RBW, VBW, detector, any setting of Average Type, any amount of
trace averaging, and any signal type. It is ineffective when the trace is not smoothed (smoothing
processes include narrow VBWs, trace averaging, and long sweep times with the detector set to Average
or Peak). It works best with extreme amounts of smoothing, and with the average detector, with the
Average Type set to Power.
Noise Floor Extensions has no effect unless the RF Input is selected, therefore it does nothing when
External Mixing is selected.
In those cases where the cancellation is ineffective, it nonetheless has no undesirable side-effects. There
is no significant speed impact to having Noise Floor Extension on.
The best accuracy is achieved when substantial smoothing occurs in each point before trace averaging.
Thus, when using the average detector, results are better with long sweep times and fewer trace
averages. When using the sample detector, the VBW filter should be set narrow with less trace averaging,
instead of a wide VBW filter with more trace averaging.
See "More Information" on page 258
Key Path
Scope
Remote Command
Example
Dependencies
EMI Receiver Mode Reference
[:SENSe]:FSCan:FINal:ATTenuation:PROTection
This command above is included for ESU compatibility. The suffix [1]|2 is irrelevant to the
measurement, they are added solely for remote language compatibility.
A.10.00
Mode Setup
A.04.00
Mode Setup, Noise Reduction
Meas Global
[:SENSe]:CORRection:NOISe:FLOor ON|OFF|1|0
[:SENSe]:CORRection:NOISe:FLOor?
CORR:NOIS:FLO ON
This key only appears in instruments with the NFE or NF2 license installed. In all others, the key does
not appear, however the SCPI command will be accepted without error (but will have no effect).
5 Mode Functions
Mode Setup
257