Spectrum Measurements
R&S
®
ESR
447
User Manual 1175.7068.02 ─ 12
Measurement Example – Measuring the Phase Noise of a Signal Generator at a
Carrier Offset of 10 kHz
Test setup:
Signal generator settings (e.g. R&S SMW):
Frequency:
100 MHz
Level:
0 dBm
Procedure:
1. Set the R&S
ESR to its default state by pressing the PRESET key.
R&S
ESR is in its default state.
2. Set the center frequency to 100 MHz and the span to 50 kHz.
a) Press the FREQ key and enter "100 MHz".
b) Press the SPAN key and enter "50 kHz".
3. Set the R&S
ESR's reference level to 0 dBm (=signal generator level) by pressing
the AMPT key and enter "0 dBm".
4. Enable phase noise measurement.
a) Press the MKR FUNC key.
b) Press the "Phase Noise" softkey.
The R&S
ESR activates phase noise measurement. Marker 1 (=main marker)
and marker 2 (= delta marker) are positioned on the signal maximum. The posi-
tion 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 by entering "10
kHz".
The R&S
ESR displays the phase noise at a frequency offset of 10 kHz. The mag-
nitude 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.
Advanced Measurement Examples
