Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
214
User Manual 1321.0950.02 ─ 07
Positive frequency offset is possible in the range from 1 Hz to 100 GHz, in steps of 1
Hz. The maximum negative frequency offset depends on the start frequency you have
set. The start frequency, taking into account the frequency offset, is always ≥ 0 Hz.
1. Press the [FREQ/DIST] key.
2. Select the "Freq Offset" softkey.
The R&S Cable Rider ZPH opens an input field to set the frequency offset.
3. Enter the frequency offset you need.
The R&S Cable Rider ZPH adds the frequency offset to the center frequency you
have set. A blue dot at the center frequency display indicates that a frequency off-
set has been set.
8.2.2.4
Defining a Start and Stop Frequency
Defining a start and a stop frequency is best suited for example, for measurements on
harmonics or signals whose exact frequency is unknown.
1. Press the [FREQ/DIST] key.
2. Select the "Start Freq" softkey.
The R&S Cable Rider ZPH opens an input field to define the start frequency.
3. Enter the start frequency you need.
4. Set a stop frequency with the "Stop Freq" softkey.
The R&S Cable Rider ZPH adjusts the horizontal axis according to your input,
beginning with the start frequency and ending with the stop frequency.
If you have entered a stop frequency that is outside the maximum frequency range,
the R&S Cable Rider ZPH sets the stop frequency to the possible maximum.
The softkey label of the "Parameter View" changes from "Center" and "Span" to
"Start" and "Stop".
8.2.2.5
Setting the Span
The span is the frequency range around the center frequency that a spectrum analyzer
displays on the screen. The span you should select depends on the signal and the
measurement that you are performing. A rule of thumb is that it should be at least twice
the bandwidth occupied by the signal.
The available span for frequency domain measurements depends on the instrument
model and installed option.
Model
Frequency upgrade option
Order number for frequency upgrade
option
Model 02 - 2MHz to 3.0 GHz
R&S ZPH-B4, 2 MHz to 4
GHz
1321.0380.02
Configuring Spectrum Measurements
