R&S FSH Spectrum Analyzer Mode
Performing Spectrum Measurements
Operating Manual 1173.6275.12 - 30 53
3.1.2.3 Setting the Channel Bandwidth
The channel bandwidth specifies the frequency range around the center frequency,
over which the R&S FSH performs the power measurement.
► Press the MEAS key.
► Press the "Chan BW" softkey.
The R&S FSH opens an input field to specify the channel bandwidth.
► Enter the channel bandwidth you need.
The R&S FSH sets the appropriate span for the channel bandwidth that you have
entered (span = 1.2 x channel bandwidth). This ensures that no incorrect channel
power measurements are made.
The minimum channel bandwidth that you can set is 833 Hz at a span of 1 kHz.
3.1.2.4 Changing the Span
Usually, the span the R&S FSH sets yields optimal results. But sometimes you also
need to see the spectrum outside the current span to detect other signal components
that you need to include in the measurement. Therefore, you can adjust the span to up
to ten times the channel bandwidth and hence still be able to see the spectrum outside
the measurement channel.
► Press the SPAN key.
In the default configuration, "Auto Span" is active. The R&S FSH automatically sets
the optimal span for the channel power measurement.
► Press the "Manual Span" softkey.
The R&S FSH opens an input field to define the span manually.
► Enter the span you need.
The largest possible span for the channel power measurement is ten times the
channel bandwidth. At larger spans, the result of the channel power measurement
would be increasingly imprecise, because too few points of the trace would be in
the channel you are measuring.
► Press the "Auto Span" softkey.
The R&S FSH again calculates the span automatically.
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