Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
175
User Manual 1321.1011.02 ─ 11
This step size is ideal for measurements on harmonics. When you increase or
decrease the center frequency, the center frequency automatically moves to
the next harmonic.
● "Manual"
An entry box is displayed to define the value.
This step size makes it easy to investigate a spectrum with frequencies at con-
stant intervals.
3. Select the step size you need from the menu.
The R&S Spectrum Rider adjusts the step size accordingly.
If you set the step size to 10 % of the span or to the center frequency, the R&S Spec-
trum Rider sets the step size internally. Manually defining the step size opens an input
field to define the step size.
6.2.2.3
Setting a Frequency Offset
For measurements on frequency converters such as satellite downconverters, it is
often convenient to reference the results to the frequency before conversion. For this
purpose, the R&S Spectrum Rider offers a frequency offset that arithmetically shifts the
center frequency to higher or lower frequencies. Thus, the R&S Spectrum Rider dis-
plays the input frequency of the DUT.
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 [FREQ] key.
2. Select "Freq Offset" softkey.
The R&S Spectrum Rider opens an input field to set the frequency offset.
3. Enter the frequency offset you need.
The R&S Spectrum Rider 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.
6.2.2.4
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 [FREQ] key.
2. Select "Start Freq" softkey.
The R&S Spectrum Rider 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.
Configuring Spectrum Measurements
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