Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
178
User Manual 1321.1011.02 ─ 06.00
In its default state, the R&S Spectrum Rider overwrites the trace after each sweep.
You can apply all detectors in this mode.
●
Average
The trace is the result of the moving average over several sweeps.
The R&S Spectrum Rider calculates the (moving) average of the power levels for
each pixel over a particular number of sweeps in the range from 2 to 999.
Averaging reduces the effects of noise, but has no effects on sine signals. Using
the trace averaging therefore is a good way to detect signals in the vicinity of noise.
You can apply all detectors in this mode.
●
Max Hold
The trace shows the maximum power levels that have been measured at each
pixel.
To overwrite a max hold trace, change a parameter in a way that the results cannot
be compared any more (e.g. the span). Using the max hold trace mode is a good
way to detect intermittent signals or the maximum values of fluctuating signals, for
example.
Using the max hold trace mode automatically activates the max peak detector.
●
Min Hold
The trace shows the minimum power levels that have been measured at each
pixel.
To overwrite a min hold trace, change a parameter in a way that the results cannot
be compared any more (e.g. the span). Using the min hold trace mode is a good
way to highlight signals within noise or suppress intermittent signals.
Using the min hold trace mode automatically activates the min peak detector.
●
View
The view trace mode freezes the current trace and aborts the measurement.
Using the view trace mode is a good way to evaluate the trace, for example with
markers.
6.2.6.2
Selecting the Detector
The number of measurement results collected in a single sweep usually is very high,
especially if the span is large. However, the display of the R&S Spectrum Rider can
display only 711 results in horizontal direction, as it is limited by the number of pixels
that are available on the display. Therefore, it has to combine measurement results to
fit them on the display. In that case, one pixel represents a frequency range = span /
711.
The detector determines the way the R&S Spectrum Rider combines and displays the
results for one pixel. The data base is the video voltage of the analyzer.
1. Press the [TRACE] key.
2. Select the "Detector" softkey.
The R&S Spectrum Rider displays the submenu to select the trace detector.
3. Select the detector you want to use.
If the "Auto Detector" selection is active, the selection of the trace detector follows
.
Configuring Spectrum Measurements
