Cable and Antenna Test Mode
R&S
®
Cable Rider ZPH
165
User Manual 1321.0950.02 ─ 07
7.3.4.1
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 Cable Rider ZPH checks if the sig-
nal is above the limit line. In case of lower limit lines, the R&S Cable Rider ZPH 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 horizon-
tal axis.
1. Press the [LINES] key.
2. Depending on the application, press the "Upper Limit" or "Lower Limit" softkey.
3. Select the "Load From File" menu item.
The R&S Cable Rider ZPH opens the file manager to select the limit line.
4. Select one of the available limit lines.
5. Press the "Load" softkey.
The R&S Cable Rider ZPH activates the limit line. In the diagram, the limit line is
displayed as a red line. See
Figure 7-11
.
If you have already selected a limit line, you can turn the limit line on and off with
the "Show Limit Lines" softkey.
Alternatively, you can define a threshold that works like a limit line. A threshold is a
simple horizontal limit line.
1. Press the "Upper Limit" or "Lower Limit" softkey.
2. Select the "Set Threshold" menu item.
The R&S Cable Rider ZPH opens an input field to define the threshold.
3. Enter the threshold you require.
The R&S Cable Rider ZPH displays the line and performs a limit check for that
threshold.
Threshold line and display line
Like the display line, a threshold line is a straight horizontal line. The difference is that
the R&S Cable Rider ZPH performs a limit check for threshold lines, but not for display
lines.
A failed limit check may be an issue if you want to create a measurement report,
because measurements with failed limits are not included in this report.
Using a display line, you can use a line and are able to create a measurement report at
the same time, regardless if any limits have been violated or not.
The process of turning off a limit line completely is similar to that of selecting a line.
1. Press the "Show Limit Lines"
The R&S Cable Rider ZPH hides the limit line.
Analyzing Measurement Results
