The Spectrum Application (RF Measurements)
R&S
®
FPL1000
462
User Manual 1178.3370.02 ─ 03
You can define the trace detector to be used for the individual traces manually, or the
R&S
FPL1000 can select the appropriate detector automatically.
The detectors of the R&S
FPL1000 are implemented as pure digital devices. All detec-
tors work in parallel in the background, which means that the measurement speed is
independent of the detector combination used for different traces.
RMS detector and VBW
If the RMS detector is selected, the video bandwidth in the hardware is bypassed.
Thus, duplicate trace averaging with small VBWs and RMS detector no longer occurs.
However, the VBW is still considered when calculating the sweep time. This leads to a
longer sweep time for small VBW values. Thus, you can reduce the VBW value to ach-
ieve more stable trace curves even when using an RMS detector. Normally, if the RMS
detector is used, the sweep time should be increased to get more stable traces.
Auto detector
If the R&S
FPL1000 is set to define the appropriate detector automatically, the detector
is set depending on the selected trace mode:
Trace mode
Detector
Clear Write
Auto Peak
Max Hold
Positive Peak
Min Hold
Negative Peak
Average
Sample Peak
View
–
Blank
–
Analyzing Several Traces - Trace Mode
If several sweep are performed one after the other, or continuous sweep are per-
formed, the trace mode determines how the data for subsequent traces is processed.
After each sweep, the trace mode determines whether:
●
The data is frozen (View)
●
The data is hidden (Blank)
●
The data is replaced by new values (Clear Write)
●
The data is replaced selectively (Max Hold, Min Hold, Average)
Each time the trace mode is changed, the selected trace memory is cleared.
The trace mode also determines the detector type if the detector is set automatically,
see
"Mapping Samples to sweep Points with the Trace Detector"
The R&S
FPL1000 supports the following trace modes:
Trace Configuration
