The Spectrum Application
FPC1000
94
User Manual 1178.4130.02 ─ 02
The "Average" trace mode calculates the (moving) average of the power levels for
each pixel over several sweeps.
Averaging reduces the effects of noise, but has no effects on sine signals.
The "Average" trace mode is a good way to detect signals in the vicinity of noise.
Selecting the "Average" trace mode automatically selects the "Sample"
●
"View"
Freezes the displayed results without updating them any longer.
The view trace mode is a good way to evaluate the trace, for example with mark-
ers.
Changing measurement settings while the trace is in "View" mode has no impact
on the displayed trace. The only exception is when you change the scale of the x-
axis - in that case, the R&S
FPC1000 writes a new trace. The fact that the dis-
played trace no longer matches the current measurement settings is indicated by
an asterisk ( ) in the diagram.
●
"Blank"
Removes the trace from the diagram.
Selecting the trace mode
1. Press the "Trace" key to open the trace menu.
2. Select the "Trace Mode" menu item to open the trace mode menu.
3. Select the trace mode you want to work with.
If you have selected the average trace mode ("Average" menu item), the
R&S
FPC1000 opens an input field to define the number of measurements inclu-
ded in the averaging ("Average Count").
4. Enter the number of sweeps to include in the averaging.
In continuous sweep mode, the R&S
FPC1000 now calculates the moving average
over the number of sweeps you have specified. In single sweep mode, it stops the
measurement after finishing the sweeps and averages the traces.
9.8.2 Detector
The number of samples collected in a single sweep usually is very large, especially if
the span is large. However, the display of the R&S
FPC1000 can display only a limited
number of results on the y-axis, because it is limited by the display resolution (one
pixel usually combines a large quantity of measurement points). Therefore, it has to
reduce the data and combine measurement results to fit them on the display.
The detector determines the way the R&S
FPC1000 combines and displays the results
for one pixel. The data base is the video voltage of the analyzer.
The following detectors are supported.
●
"Auto Peak"
The auto peak detector displays both the highest and the lowest power levels that
were measured in the frequency range covered by a pixel.
Trace Configuration
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