Cable and Antenna Test Mode
R&S
®
Cable Rider ZPH
153
User Manual 1321.0950.02 ─ 07
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 "TG Power" softkey.
The R&S Cable Rider ZPH opens an input field to specify the output level.
3. Enter the desired output level of the signal in dBm.
7.2.5
Setting the Measurement Bandwidth
Bandwidth setting is only available with model .12 in Transmission (S21) measure-
ment.
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 1 MHz in a 1-3 sequence.
1. Press the [DTF/BW] key.
In its default state, the R&S Cable Rider ZPH selects the bandwidth automatically
("Auto Bandwidth"). In that state, the bandwidth is coupled to the span.
The default setting is a compromise between measurement speed and good per-
formance.
2. Press the "Bandwidth" softkey.
The R&S Cable Rider ZPH opens a submenu to select the bandwidth setting.
3. Select the "Manual Bandwidth".
The R&S Cable Rider ZPH opens an input field to specify the resolution bandwidth
("RBW") setting.
4. Enter the measurement bandwidth you require.
As an indicator that the "RBW" is no longer coupled to the span, the R&S Cable
Rider ZPH displays a blue dot in front of the "RBW" item in the hardware settings.
7.2.6
Setting the Measurement Sweep
The [SWEEP] key provides menu to control the response on how the measurement
results are presented.
Configuring Cable and Antenna Tests
