Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
221
User Manual 1321.0950.02 ─ 07
● If seleected signal source is "Coupled CW", the R&S Cable Rider ZPH coupled
the output signal source frequency with the current measurement center fre-
quency
Defining the level of the stimulus signal
You can define the level of the stimulus signal an absolute level in terms of dBm as
1. Select the "Source Level" softkey.
The R&S Cable Rider ZPH opens an input field to specify the source level.
2. Enter the required source level.
Note that the actual output level you measure can deviate from the value you enter and
may not be linear over the frequency range of the measurement. It is recommend to
always normalize or calibrate a measurement to compensate for any level variations
caused by the tracking generator. For more information about calibration, see
Chap-
ter 7.1.7, "Calibrating Measurements"
,
on page 137.
Tracking generator output level
Using a tracking generator attenuation of 0 dB for S12 or S21 measurements 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.
Turning the tracking generator on and off
1. Select the "Source Mode" softkey.
The R&S Cable Rider ZPH opens the submenu that contains the signal source
selection.
2. Select "Off" menu item.
The R&S Cable Rider ZPH turns off the signal source.
8.2.5
Setting Bandwidths
The bandwidth menu contains all settings to set up filter bandwidths available in the
R&S Cable Rider ZPH. You can access it with the [BW] key.
●
Setting the Resolution Bandwidth
......................................................................... 221
●
Setting the Video Bandwidth
................................................................................. 223
8.2.5.1
Setting the Resolution Bandwidth
The resolution bandwidth in a spectrum analyzer determines the frequency resolution
for frequency domain measurements and therefore determines how well it can sepa-
rate adjacent frequencies. The measurement result observed depends on the pass-
band of a resolution filter.
Configuring Spectrum Measurements
