Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
132
User Manual 1321.1011.02 ─ 11
6.1.3.3
Setting the Channel Bandwidth
The channel bandwidth specifies the frequency range around the center frequency,
over which the R&S Spectrum Rider performs the power measurement.
1. Press [MEAS] key.
2. Select "Channel BW" softkey.
The R&S Spectrum Rider opens an input field to define the channel bandwidth.
3. Enter the channel bandwidth you need.
The R&S Spectrum Rider sets the appropriate span for the channel bandwidth that
you have entered (span = 5 x channel bandwidth). This ensures that no incorrect
channel power measurements are made.
The minimum channel bandwidth that you can set is 2 kHz at a span of 1 kHz.
6.1.3.4
Defining the Percentage of Occupied Bandwidth
By default, the power percentage inside the occupied bandwidth is 99 %, a number
most standards require. If you measure standards that specify another power percent-
age you can change that value.
1. Press [MEAS] key.
2. Select "% Power BW" softkey.
The R&S Spectrum Rider opens an input field to define the power percentage.
3. Enter the power percentage you need.
The value you enter here is the power percentage that has to be inside the channel
bandwidth relative to the power over the total span (the percentage of the total
power).
The R&S Spectrum Rider now displays the occupied bandwidth graphically in the
trace window and numerically above the trace window.
6.1.3.5
Changing the Span
The span that the R&S Spectrum Rider usually sets yields optimal results. But some-
times 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 still be able to see the spectrum
outside the measurement channel.
1. Press [SPAN] key.
In the default configuration, "Auto Span" is active. The R&S Spectrum Rider auto-
matically sets the optimal span for the channel power measurement.
2. Select "Manual Span" softkey.
The R&S Spectrum Rider opens an input field to define the span manually.
3. Enter the span you need.
Performing Spectrum Measurements
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