R&S FSH
Spectrum Analyzer Mode
Configuring Spectrum Measurements
Operating Manual 1309.6275.12 - 14
107
Threshold line and display line
Like the display line, a threshold line is a straight horizontal line. The difference is that
the R&S FSH 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.
M
Press the "Upper Limit" or "Lower Limit" softkey
M
Select the "Unselect Limit" menu item.
The R&S FSH deactivates the limit line.
2.2.8.2 Performing Limit Checks
If limit lines are active, the R&S FSH automatically checks the trace for limit violations
after each frequency sweep. As long as the signal does not violate the limit line, the
R&S FSH shows a "Pass" message in the measurement diagram.
As soon as one single value (i.e. one pixel) is outside of the limits, the R&S FSH
displays a "Fail" message in the diagram area and, in addition, sounds a beep. In
addition, the limit line turns red in the segments where the signal violates the line.
A limit checks relates only to the frequency range defined by the limit line, not the
span.
You can turn the acoustic signal that sounds in case of a limit violation on and off.
M
Press the "Options" softkey.
M
Select the "Audio Beep" menu item.
An [X] in front of the "Audio Beep" menu item indicates that the beeper is active. If
the audio beep is active, the R&S FSH beeps each time a limit is violated.
Limit violation
Note that a limit check fails only if the signal
exceeds
the limit line.
If the signal level is the same as the limit value, the limit check passes.
