Keysight x-series Instruction Manual

3 Short-Range Comms & IoT Mode
3.9 Occupied BW Measurement
Pros & Cons of Adaptive NFE
Adaptive NFE provides an alternative to fully-on or fully-off NFE. Fully-on NFE can,
notably in cases with little or no averaging of the spectrum, result in a display that is
distractingly unfamiliar in the variability in response to low level signals. Fully-off
NFE fails to achieve the potential improvement in dynamic range and associated
accuracy of measurement of low-level signals. Adaptive NFE controls the degree of
potential improvement in the noise floor to give more improvement for those
instrument settings that can make good use of the potential improvement—those
settings with high degrees of variance reduction through some variant of averaging.
When the potential improvement is small, the display acts like the fully-off case, and
when it is high, it acts like the fully-on case, and in-between, application is a
compromise between attractiveness and effectiveness.
In Adaptive NFE, there is not the same dramatic visual impact on the noise floor as
there is in Full NFE. Adaptive NFE controls the amount of correction that is applied
based on other instrument settings like RBW, averaging and sweep time. Adaptive
NFE controls the degree of potential improvement in the noise floor to give more
improvement for those instrument settings that can make good use of the potential
improvement, such as settings that provide more averaging. The result is that when
not much averaging is being performed, the signal displays more like the fully-off
case; and when lots of averaging is being performed, the signal displays more like
the Full NFE case.
Adaptive NFE is recommended for general-purpose use. For fully-ATE (automatic
test equipment) applications, where possible distraction of the instrument user is
not a risk, Full NFE is recommended.
NFE On/Off Command
Remote Command
[:SENSe]:CORRection:NOISe:FLOor ON | OFF | 1 | 0
[:SENSe]:CORRection:NOISe:FLOor?
Example
:CORR:NOIS:FLO ON
Dependencies Only appears in instruments with the NFE or NF2 license installed. In all others, the control does not
appear. In those cases, the SCPI command is accepted without error, but has no effect
Couplings When NFE is enabled in any Mode manually, a prompt is displayed reminding you to perform the
Characterize Noise Floor operation if it is needed
When NFE is enabled through SCPI, and a Characterize Noise Floor operation is needed, an error is
entered in the system error queue
Preset Unaffected by Mode Preset. Turned ON at startup and by Restore Mode Defaults in Modes that
support Adaptive. Turned OFF at startup and by Restore Mode Defaults in Modes that do not support
Adaptive
In Modes that support Adaptive NFE, the default (preset) state of NFE is Adaptive. In Modes that do
not support Adaptive NFE, the default state of NFE is Off
State Saved No
Short Range Comms & IoT Mode User's &Programmer's Reference 1309

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)