R&S FSH Getting Started
Using the Spectrum Analyzer
Quick Start Guide 1309.6269.12 - 09 56
Measuring the frequency
The trace consists of 631 measurement points (frequency points). The marker is
always positioned on one of these measurement points. The R&S FSH calculates the
marker frequency from the frequency of the measurement point, the center frequency
and the frequency span that have been set. The measurement-point resolution, and
consequently the accuracy of the marker frequency readout, therefore depend on the
frequency span that has been selected.
The R&S FSH has a frequency counter to increase the accuracy of the marker-
frequency readout. It stops the sweep at the marker position, counts the frequency and
then continues the sweep.
► Press the MARKER key.
► Press the "Marker Function" softkey.
► Select the "Frequency Count" menu item.
The marker label "M" turns to a "C" to indicate an active frequency counter. When
the frequency counter is active, the resolution of the frequency readout is always
1 Hz, regardless of the span. The accuracy is determined by the internal reference
frequency which is far more exact than that of the pixel-oriented marker readout.
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