Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
127
User Manual 1321.1011.02 ─ 11
Chapter 4.8, "Managing Datasets"
6.1.2.2
Setting the Reference Level
The reference level is the power level that the R&S Spectrum Rider expects at the RF
input. When selecting the reference level, make sure that you do not overload the R&S
Spectrum Rider by applying a signal whose power exceeds the maximum reference
level.
As the power is measured with a small resolution bandwidth compared to the signal
bandwidth, it is still possible to overload the R&S Spectrum Rider, even if the trace is
within the measurement diagram. To prevent an overload, perform the measurement
with the largest resolution bandwidth possible using the peak detector. If you set these
parameters, it is not possible for the trace to exceed the reference level.
To simplify operation and to prevent incorrect measurements, the R&S Spectrum Rider
has an automatic routine for setting the reference level.
1. Press [MEAS] key.
2. Select "Level Adjust" softkey.
The R&S Spectrum Rider performs a measurement to determine the optimal refer-
ence level.
It uses a resolution bandwidth of 3 MHz, a video bandwidth of 3 MHz and the peak
detector. After finishing the automatic measurement, the R&S Spectrum Rider sets
the optimal reference level.
6.1.2.3
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 specify the channel bandwidth.
3. Enter the channel bandwidth you required.
The R&S Spectrum Rider 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.
Performing Spectrum Measurements
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