Measurements
R&S
®
FSW
283
User Manual 1173.9411.02 ─ 19
5.11.6 Measurement Example – Measuring the R&S
FSW's Intrinsic Inter-
modulation
Test setup:
Signal
Generator 1
Coupler
[- 6 dB]
R&S FSW
Signal
Generator 2
Signal generator settings (e.g. R&S
FSW SMU):
Device
Level
Frequency
Signal generator 1
-4 dBm
799.6 MHz
Signal generator 2
-4 dBm
800.4 MHz
Setting up the measurement
1. Preset the R&S
FSW.
2. Set the center frequency to
800 MHz
and the frequency span to
3 MHz
.
3. Set the reference level to
-10 dBm
and RF attenuation to
0 dB
.
4. Set the resolution bandwidth to
10 kHz
.
The noise is reduced, the trace is smoothed further and the intermodulation prod-
ucts can be seen clearly.
5. Set the VBW to "1 kHz".
Measuring intermodulation using the Third Order Intercept (TOI) measurement
function
1. Press the MEAS key and select the "Third Order Intercept" measurement function
from the "Select Measurement" dialog box.
The R&S
FSW activates four markers to measure the intermodulation distance.
Two markers are positioned on the useful signals and two on the intermodulation
products. The TOI is calculated from the level difference between the useful sig-
nals and the intermodulation products. It is then displayed on the screen:
Third Order Intercept (TOI) Measurement
