The Spectrum Application
R&S
®
FPC
71
User Manual 1178.4130.02 ─ 07
14.2.1.1
About the Measurement
The following prerequisites and settings are necessary to obtain correct results for the
channel power measurement.
●
Define the correct channel bandwidth.
Only the signal to be measured should be visible in the diagram. An additional sig-
nal would falsify the measurement.
●
Define a sufficient
.
●
.This ensures that the power measurement is always cor-
rect irrespective of the waveform being investigated.
Define a sufficient
The span is always coupled to the channel bandwidth (span = 1.2 to 5 x
channel band-
width, depending on the channel bandwidth). When you change the channel band-
width, the R&S
FPC automatically adjusts the span, but not the other way around.
14.2.1.2
Configuration
Access
: "Meas"
The channel bandwidth measurement supports several settings exclusive to that mea-
surement. These are available in the measurement menu.
Defining the channel bandwidth
The channel bandwidth is the bandwidth of the signal that you are measuring.
Note that the channel bandwidth and
are coupled. When you select a
channel bandwidth, the R&S
FPC automatically defines an appropriate span for the
channel bandwidth you have defined (span = 1.2
x
channel bandwidth). This mecha-
nism ensures correct channel power measurements.
1. Press the "Meas" key to open the measurement menu.
2. Select the "Chan Bandwidth" menu item.
The R&S
FPC opens an input field to define the channel bandwidth.
3. Enter the channel bandwidth you need.
Note:
The minimum channel bandwidth that you can set is 833
Hz at a span of
1
kHz.
Measuring the maximum channel power
If signal levels fluctuate significantly, you can measure the maximum channel power
with the max hold function.
1. Press the "Meas" key to open the measurement menu.
2. Select the "Power Display" menu item.
3. Select the "Max Hold" menu item.
Measurements and Result Displays
