R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Getting Started
Measuring the Spectrums of Complex Signals
2.2.1.1 Measurement Example – Measuring the R&S FSQ’s Intrinsic Intermodulation
Distance
To measure the intrinsic intermodulation distance, use the test setup shown in the
figure below.
Test setup
Signal generator settings (e.g. R&S SMIQ)
Measurement using the R&S FSQ
1. Set the R&S FSQ to the analyzer mode.
➢ Press the SPECTRUM key.
The R&S FSQ is in the analyzer mode.
2. Set center frequency to 1 GHz and the frequency span to 1 MHz.
➢ Press the FREQ key and enter 1 GHz.
➢ Press the SPAN key and enter 1 MHz.
3. Set the reference level to –10 dBm and RF attenuation to 0 dB.
➢ Press the AMPT key and enter -10 dBm.
➢ Press the RF ATTEN MANUAL softkey and enter 0 dB.
By reducing the RF attenuation to 0 dB, the level to the R&S FSQ input mixer
is increased. Therefore, 3 rd order intermodulation products are displayed.
4. Set the resolution bandwidth to 5 kHz.
➢ Press the BW key.
Level Frequency
Signal generator 1 -10 dBm 999.9 MHz
Signal generator 2 -10 dBm 1000.1 MHz
➢ Press the RES BW MANUAL softkey and enter 5 kHz.
By reducing the bandwidth, the noise is further reduced and the
intermodulation products can be clearly seen.
5. Measuring intermodulation by means of the 3rd order intercept
measurement function.
➢ Press the MEAS key.
Operating Manual 1313.9681.12 - 01 2.5