To Next Page

To Previous Page

3 Short-Range Comms & IoT Mode

3.10 Spurious Emissions Measurement

3.10.8.3 Advanced

Contains controls for setting advanced functions of the instrument.

This tab does not appear in VXT.

Noise Floor Extension

Allows you to turn on/configure the Noise Floor Extension (NFE) function. Some

Modes (such as Spectrum Analyzer), support two states of NFE, Full and Adaptive.

The ON state (in Modes that do not support Adaptive NFE) matches the FULL state

(in Modes that do support Adaptive NFE).

In ON or FULL NFE, 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).

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 NFE-off

case; and when lots of averaging is being performed, the signal displays more like

the full-NFE case.

Adaptive NFE (in Modes that support it) is recommended for general-purpose use.

For fully ATE (automatic test equipment) applications, where the distraction of a

person using the instrument is not a risk, Full NFE is recommended.

NFE 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

1470 Short Range Comms & IoT Mode User's &Programmer's Reference

Keysight x-series Instruction Manual

Other manuals for Keysight x-series