The Spectrum Application
R&S
®
FPC
131
User Manual 1178.4130.02 ─ 07
You can create and edit limit lines with the R&S
InstrumentView software package and
then transfer them into the internal memory of the R&S
FPC. The number of limit lines
you can store in the memory depends on other datasets available on theR&S
FPC or, if
you are using an external storage device (for example memory stick), the size of it.
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.
Upper limit lines check if the signal is or remains below the limit line.
Lower limit lines check if the signal is or remains above the limit line.
You also have to make sure that the limit line is compatible to the scale of the x-axis.
1. Press the "Lines" key top open the lines menu.
2. Make sure that the "Show Limit Lines" menu item is active (highlighted).
3. Select the "Upper Limit" or the "Lower Limit" menu item.
4. Select the "Load From File" menu item to open the file manager.
The R&S
FPC opens the directory that contains the limit lines by default
(
\LimitLines\
). If you have stored limit lines in another directory, you have to
navigate to that directory first.
By default, the R&S
FPC shows all limit lines available in the selected directory
(files with the
.abslim
or
.rellim
extension), even those that are not compatible
to the current diagram scale.
5. Select the "Show Compatible" menu item to filter the available limit lines.
The R&S
FPC shows only the limit lines that you can apply to the current diagram
scale.
6. Select one of the available files and confirm the selection with the "Load" menu
item.
The R&S
FPC displays the limit line. In the diagram area, the limit line is represen-
ted by a red line whose shape depends on the limits
If you have selected a limit line that is not compatible to the current diagram scale,
the R&S
FPC displays a message that it cannot apply the selected limit line.
Using a threshold line
A threshold line is a straight horizontal limit line whose limits are the same over the
complete frequency range.
1. Press the "Lines" key top open the lines menu.
2. Make sure that the "Show Limit Lines" menu item is active (highlighted).
3. Select the "Upper Limit" or the "Lower Limit" menu item.
4. Select the "Set Threshold" menu item.
The R&S
FPC opens an input field to define the limit line threshold.
Limit Lines
