R&S ZVH
Spectrum Analyzer Mode (R&S ZVH-K1)
Configuring Spectrum Measurements
Operating Manual 1309.6946.12 - 09
122
4.2 Configuring Spectrum Measurements
4.2.1 Configuring the Horizontal Axis
The FREQ/DIST key contains all necessary functions to configure the horizontal axis
for spectrum measurements.
The contents of the menu depend on the currently selected measurement.
Usually, the horizontal axis contains frequency information in spectrum mode. You can
specify the frequency in terms of the center frequency or by defining a start and stop
frequency for a particular span.
If you know the frequency of the signal you are measuring, it is best to match the
center frequency to the signal's frequency. If you are investigating signals, e.g.
harmonics, that are within a particular frequency range, the best option is to enter a
start and stop frequency to define the span.
4.2.1.1 Defining the Center Frequency
The center frequency represents the frequency at the center of the horizontal axis in
the diagram area.
► Press the FREQ/DIST key.
The R&S ZVH opens the frequency menu.
When you press the FREQ/DIST key, the R&S ZVH automatically opens an input
field to define the center frequency. If the input field is inactive, you can open it with
the "Center Freq" softkey.
► Enter the center frequency you need.
The frequency you have entered becomes the new center frequency.
While adjusting the center frequency, you may obtain a value that is outside the
R&S ZVH maximum span. If this happens, the R&S ZVH automatically reduces the
span.
4.2.1.2 Defining a Frequency Step Size
If you set the center frequency with the rotary knob or the cursor keys, the distance of
each step that you take depends on the span. With the rotary knob, the smallest
possible step is a pixel. As the trace consists of 631 pixels, each step is equal to 1/630
of the span. With the cursor keys, the step is 10% of the span or one division of the
grid.
You can set another step size.
► Press the FREQ/DIST key.
► Press the "CF Step Size" softkey.
The R&S ZVH opens a submenu that contains possible step sizes.
