Noise Measurements R&S FSL
1300.2519.12 2.24 E-11
2. Set the center frequency to 100 MHz and the span to 50 kHz.
Press the FREQ key and enter 100 MHz.
Press the SPAN key and enter 50 kHz.
3. Set the R&S FSL's reference level to 0 dBm (=signal generator level).
Press the AMPT key and enter 0 dBm.
4. Enable phase noise measurement.
Press the MKR key.
Press the Phase Noise/Ref Fixed softkey.
The R&S FSL activates phase noise measurement. Marker 1 (=main marker) and marker 2 (=
delta marker) are positioned on the signal maximum. The position of the marker is the
reference (level and frequency) for the phase noise measurement. A horizontal line represents
the level of the reference point and a vertical line the frequency of the reference point. The
dialog box for the delta marker is displayed so that the frequency offset at which the phase
noise is to be measured can be entered directly.
5. Set the frequency offset to 10 kHz for determining phase noise.
Enter 10 kHz.
The R&S FSL displays the phase noise at a frequency offset of 10 kHz. The magnitude of the
phase noise in dBc/Hz is displayed in the delta marker output field at the top right of the screen
(Phn2).
6. Stabilize the measurement result by activating trace averaging.
Press the TRACE key.
Press the Trace Mode key.
Press the Average softkey.
Fig. 2-18 Measuring phase noise with the phase–noise marker function
The frequency offset can be varied by moving the marker with the rotary knob or by entering a
new frequency offset as a number.
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