Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
319
User Manual 1178.8520.02 ─ 08
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
FSV/A 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 signals
and the intermodulation products. It is then displayed on the screen:
The third order intercept (TOI) is displayed in the marker information.
2. The level of a signal analyzer's intrinsic intermodulation products depends on the
RF level of the useful signals at the input mixer. When the RF attenuation is added,
the mixer level is reduced and the intermodulation distance is increased. With an
additional RF attenuation of 10 dB, the levels of the intermodulation products are
reduced by 20 dB. The noise level is, however, increased by 10 dB.
Increase the RF attenuation to 20 dB to reduce intermodulation products.
The R&S
FSV/A's intrinsic intermodulation products disappear below the noise
floor.
Third order intercept (TOI) measurement
