Noise Figure Measurements Option (K30) R&S FSL
1300.2519.12 2.102 E-11
3. Press the ENR Settings softkey to open the ENR dialog box.
In the ENR Constant field, enter the average ENR value of the used noise source for the
frequency range of interest, for example 15 dB.
4. Press the Meas Settings softkey to open the Measurement Settings dialog box.
Activate the 2nd Stage Correction option to perform the measurement as accurately as
possible.
Performing the calibration
1. Connect the
noise source to the RF input of the R&S FSL (see Fig. 2-73).
2. If you perform the measurement in an environment with radiated emissions, you may consider to
connect a lowpass filter to the voltage supply input of the noise source.
3. Provide the voltage supply for the noise source by connecting it to the +28 V connector of the
R&S FSL (labeled NOISE SOURCE CONTROL on the rear panel of the instrument) via a coax
cable and the lowpass filter. Connect the lowpass filter between the noise source itself and the
NOISE SOURCE CONTROL connector of the R&S FSL as shown in Fig. 2-73.
The purpose of the lowpass filter is to suppress any interference (e.g. due to RF interference),
including interference from the supply line. This makes it possible to perform very precise
measurements.
Fig. 2-73: Preparation for calibration
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