The Spectrum Application
R&S
®
FPC
94
User Manual 1178.4130.02 ─ 07
●
In terms of a start and stop frequency from which the center frequency is automati-
cally derived.
●
In terms of a channel table that contains (frequency) information about a set of
transmission channels.
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14.3.1
Measurement Frequency
The measurement frequency (or center frequency) is the frequency that the spectrum
analyzer tunes to. It is represented by the frequency at the center of the x-axis in the
diagram area.
If you know the (approximate) frequency of the signal you are measuring, you can sim-
ply match the frequency of the DUT to the center frequency and define an appropriate
If you are measuring unknown signals within a greater frequency range, for example
harmonics, it is better to define the frequency range based on
Defining a center frequency
1. Press the "Freq" key to open the frequency menu.
2. Select the "Center Freq" menu item.
The R&S
FPC opens an input field to define the center frequency.
Tip:
When you press the "Freq" key, the R&S
FPC automatically opens an input
field to define the center frequency. If the input field is inactive, you can open it with
the "Center Freq" menu item.
3. Enter the required frequency.
The frequency you have entered becomes the new center frequency.
While adjusting the center frequency, you can obtain a value that is outside the
R&S
FPC maximum span. If this happens, the R&S
FPC automatically reduces the
span.
You can also define the frequency by selecting a specific transmission channel. In
that case, the frequency is defined in a channel table. For more information, see
Defining a frequency step size
You can change the center frequency in fixed steps easily with the rotary knob or the
cursor keys.
Frequency Configuration
