3 Short-Range Comms & IoT Mode
3.12 Monitor Spectrum Measurement
3.12.8.3 Advanced
Contains controls for setting advanced function s of the instrument.
This tab does not appear in EXM or VXT.
Noise Floor Extension
When this function is ON, the expected noise power of the instrument (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.
NOTE
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 1715.
Remote Command
[:SENSe]:CORRection:NOISe:FLOor ON | OFF | 1 | 0
[:SENSe]:CORRection:NOISe:FLOor?
Example
:CORR:NOIS:FLO ON
Dependencies This control only appears in instruments with the NFE or NF2 license installed. In all others, the
control does not appear, however the SCPI command will be accepted without error (but will have no
effect)
Couplings When NFE is enabled in any mode manually, a prompt will be displayed reminding you to perform the
Characterize Noise Floor operation if it is needed. If NFE is enabled through SCPI and a Characterize
Noise Floor operation is needed, an error will be entered in the system error queue
Preset Unaffected by Mode Preset. Turned off by Restore Mode Defaults
State Saved No
1714 Short Range Comms & IoT Mode User's &Programmer's Reference
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