Rohde & Schwarz 3030.3013.02, Системное руководство, Страница: 59 / 70

Operating with ARGUS-UMS UMS100/120/120 System Manual
57 3030.3059.72-02.00
2.4.4 Creating limit lines
• In the actual measurement mode, a scan is started for the required frequency range and then
stopped when the display result is satisfactory. This shall form the “as it is” status of the spectrum.
•
In the scan window click the button <Create Limit Line> (disk symbol with green scan curve on top).
The
Navigator window opens for entering a name. Click <New> to close the window.
Figure 2-26: Creating a Limit Line from the Scan graph
Enter an Offset for the measured spectrum in the Create Limit Line window that follows.
• Set the appropriate Offset . Positive or negative offset depends on whether the alarm goes off when
the Limit Line is later overshoot or undershoot in the automatic measurement.
• A positive offset of 5 dB for example, pushes the limit up. Slight level fluctuations do not trigger the
alarm with the
Overshoot setting; however it will be triggered if there is a new, stronger and
unknown signal.
• If a signal is too weak and is under the limit with the Undershoot setting or disappears completely,
the alarm will then be triggered.
• In case that previously Max Hold was switched on also the Max Hold line can be saved as limit line.
If Max Hold was running some time before saving, smaller fluctuations in signals are recorded and
as an effect out of this, for
Overshoots the Offset can be set to smaller values.
Figure 2-27: Offset setting for the Limit Line
Click <OK> to quit.
The
Limit Line can now be selected during the definition of AMM.