Cable and Antenna Test Mode
R&S
®
ZNH
132
User Manual 1334.5985.02 ─ 02
7.2.3.5
Setting the Attenuation
The R&S
ZNH provides functions to attenuate the signal at the RF input.
1. Press the [SCALE/AMPT] key.
2. Select the "Receiver Att" softkey.
The R&S
ZNH opens an input filed to specify the attenuation level.
3. Enter the attenuation of the signal at the RF input.
You can set an RF attenuation in the range from 0 dB to 30 dB in 5 dB steps.
7.2.4
Configuring the Tracking Generator
Tracking generator output level
Using an output level of 0 dBm (or a receiver attenuation of 0 dB) for S12 or S21 mea-
surements can cause an overload at the RF input. It is therefore recommended to use
an output level of -10 dBm (default) or lower for these measurements. This especially
applies to measurements on amplifiers.
1. Press the [SCALE/AMPT] key.
2. Select the "Port Config" softkey.
The R&S
ZNH opens a submenu to configure port settings.
3. Select the "Port Power" menu item.
The R&S
ZNH opens an input field to specify the output level.
4. Enter the desired output level of the signal in dBm.
7.2.5
Setting the Measurement Bandwidth
The measurement bandwidth determines the noise figure of the receiver. Small band-
widths result in higher measurement dynamics for S21 measurements. However, small
bandwidths cause longer measurement times because of the settling time of the filter.
Possible bandwidths are between 10 Hz and 100 kHz in a 1-3 sequences.
1. Press [SWEEP] key.
2. Select the "Meas BW" softkey.
The R&S
ZNH opens an input field to specify the measurement bandwidth.
3. Enter the measurement bandwidth you require.
As an indicator that the "Meas BW" is no longer coupled to the span, the R&S
ZNH
displays a blue dot in front of the "Meas BW" item in the parameter view.
Configuring Cable and Antenna Tests
