Rohde & Schwarz FPC1000 User Manual page 72

FPC1000
Define a sufficient span.
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 FPC1000 automatically adjusts the span, but not the other way around.
9.2.1.2 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
channel bandwidth, the R&S FPC1000 automatically defines an appropriate span for
the channel bandwidth you have defined (span = 1.2 x channel bandwidth). This mech-
anism 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 FPC1000 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.
The displayed result shows the highest channel power that has been measured
(indicated by the "Max Power" result in the diagram header.
4. You can return to the normal power display by selecting the "Clear / Write" menu
item instead.
Measuring the channel power density
By default, the R&S FPC1000 the channel power result corresponds to the complete
channel bandwidth you have selected. You can also display the channel power that
corresponds to a bandwidth of 1 Hz. In that case, the results are no longer displayed in
dBm, but in dBm/Hz.
User Manual 1178.4130.02 ─ 02
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The Spectrum Application
Measurements and Result Displays
frequency span are coupled. When you select a
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