R&S FSL Noise Figure Measurements Option (K30)
1300.2519.12 4.249 E-11
If the second stage correction is activated (Measurement Settings dialog box, 2nd Stage Correction
o
ption), a separate calibration measurement is performed before the main measurement (for details on
the measurement setup refer to chapter "Advanced Measurement Examples"). The data measured in
the calibration measurement are used for compensation in the main measurement.
It is strongly recommended to perform calibration before running measurements (Cal softkey). It is
possible to run measurements in an uncalibrated status, but the measurement results will not be
corrected for any noise introduced by the spectrum analyzer itself.
If the list of receive frequencies (RF) is changed, at which the measurements are performed, calibration
is necessary again to ensure that calibration data are available for every measurement step. For details
on frequency settings refer to the Freq Settings softkey.
Measurement forms
Two forms of measurements are possible:
• frequency list measurement
A measurement is performed at each of the frequencies listed in the frequency list (Freq Settings
softkey). The noise figure of the DUT across a user–specified range of frequencies is measured. In
single sweep mode, each frequency point is measured once and complete. In continuous sweep
mode, one frequency point after the other is measured in turn until the measurement is aborted.
• fixed frequency measurement
A continuous measurement is performed at the single frequency currently selected in the
Frequency List Results. This individual frequency from the frequency list measurement is
investigated in more detail, for example to see the effect of dynamic changes to the noise figure of
the DUT at a particular frequency (see also Fix Freq softkey).
Measurement settings
The overall measurement settings used to obtain the current measurement results are displayed below
the title bar (see Fig. 4-24). The following settings are listed:
Setting Defined in
RBW
Measurement Settings dialog box, RBW field
Average
Measurement Settings dialog box, Average field
RF Attenuation
Measurement Settings dialog box, RF Attenuation field
Auto Ref Level
Measurement Settings dialog box, Automatic Ref Level field
2nd Stage Corr
Measurement Settings dialog box, 2nd Stage Correction field
Image Rej
Frequency Settings dialog box, Image Rej field
Fig. 4-24 Measurement settings for the noise figure measurement (example)
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