User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
245User Manual 1178.3370.02 ─ 09
Test setup:
Signal generator settings (e.g. R&S SMW):
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 FPL1000.
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 FPL1000 activates four markers to measure the intermodulation dis-
tance. Two markers are positioned on the useful signals and two on the intermodu-
lation products. The TOI is calculated from the level difference between the useful
signals and the intermodulation products. It is then displayed on the screen:
Measurements and Results