R&S FSH
Spectrum Analyzer Mode
Configuring Spectrum Measurements
Operating Manual 1309.6275.12 - 14
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After turning on a limit line, the R&S FSH checks if the signal violates the shape of the
limit line. If one or more signal levels violate the limits defined, the R&S FSH shows the
points of violation. You can also activate an audio signal that sounds every time a limit
is violated.
You can create and edit limit lines with the R&S FSH4View software package and then
transfer them into the internal memory of the R&S FSH. The number of limit lines you
can store in the memory depends on other datasets available on the R&S FSH or, if
you are using an external storage device (e.g. memory stick), the size of it.
For more information see "
Saving and Loading Instrument Settings and Measurement
2.2.8.1 Selecting a Limit Line
Before selecting a limit line, you need to decide if you want to use it as an upper or
lower limit line. In case of upper limit lines, the R&S FSH checks if the signal is above
the limit line. In case of lower limit lines, the R&S FSH checks if the signal is below the
limit line.
You also have to make sure that the limit line is compatible to the scale of the
horizontal axis.
M
Press the LINES key.
M
Depending on the application, press the "Upper Limit" or "Lower Limit" softkey.
The R&S FSH opens a dialog box to select the limit line.
M
Select the "Load From File…" menu item.
M
Press the "Sort/Show" softkey.
M
Select the "Show Compatible" menu item.
The R&S FSH shows all limit lines that are compatible to the current settings.
M
Select one of the available limit lines.
M
Press the "Select" softkey.
The R&S FSH activates the limit line. In the diagram, the limit line is displayed as a
yellow line.
If you have already selected a limit line, you can turn the limit line on and off with
the "Limits On/Off" softkey.
Alternatively, you can define a threshold that works like a limit line. A threshold is a
simple horizontal limit line.
M
Press the "Upper Limit" or "Lower Limit" softkey.
M
Select the "Threshold" menu item.
The R&S FSH opens a input field to define the threshold.
M
Enter the threshold you need.
The R&S FSH displays the line and performs a limit check for that threshold.
