Keysight FieldFox B Series User Manual page 700

Noise Figure Mode (Option 356)
How to Define a Noise Figure Measurement
Resolution Bandwidth (Res BW)
Avoid setting the resolution bandwidth (Res BW) greater than the
bandwidth of the measured DUT.
In NF Mode, the Res BW settings increase the measurement speed and quality
of a measured noise figure. The wider (higher) the Res BW, the faster and
better the noise figure measurement. However, as the Res BW is narrowed, the
sweep speed becomes slower and the measurement quality is degraded.
So: Wider Res BW = better noise measurement and faster measurement time
How to set Res BW
— Press BW 2.
— Then
— Then choose from the following:
The current Res BW setting is shown at the bottom of the screen.
This setting could impact the accuracy of the measurement. See Specifications
in
https://www.keysight.com/us/en/assets/7018-03314/data-sheets/5990-97
83.pdf.
Alignments
The Noise Figure mode requires alignment types: amplitude. Refer to the SA
chapter's
700
Res BW.
— 300 kHz | 1 MHz | 3 MHz | 5 MHz
bandwidth.
"Alignments" on page 204
Press the desired resolution
for information on all alignments.
Keysight N9938-90006 User's Guide