R&S FSL Using Limit Lines and Display Lines – LINES Key
1300.2519.12 4.123 E-11
Limit Lines
Limit lines are used to define amplitude curves or spectral distribution boundaries on the display screen
which are not to be exceeded. They indicate, for example, the upper limits for interference radiation or
spurious waves which are allowed from a device under test (DUT). For transmission of information in
TDMA systems (e.g. GSM), the amplitude of the bursts in a timeslot must adhere to a curve that falls
within a specified tolerance band. The lower and upper limits may each be specified by a limit line.
Then, the amplitude curve can be controlled either visually or automatically for any violations of the
upper or lower limits (GO/NOGO test).
The instrument supports limit lines with a maximum of 50 data points. 8 of the limit lines stored in the
instrument can be activated simultaneously. The number of limit lines stored in the instrument is only
limited by the capacity of the flash disk used. For details see also "To select a limit line" on page 4.119.
Limit lines are compatible with the current measurement settings, if the following applies:
• The x unit of the limit line has to be identical to the current setting.
• The y unit of the limit line has to be identical to the current setting with the exception of dB based
units; all dB based units are compatible with each other.
At the time of entry, the R&S FSL immediately checks that all limit lines are in accordance with the
following guidelines:
• The frequencies/times for each data point must be entered in ascending order, however, for any
single frequency/time, two data points may be entered (vertical segment of a limit line).
• The data points are allocated in order of ascending frequency/time. Gaps are not allowed. If gaps
are desired, two separate limit lines must be defined and then both enabled.
• The entered frequencies/times need not necessarily be selectable in R&S FSL. A limit line may also
exceed the specified frequency or time range. The minimum frequency for a data point is –200
GHz, the maximum frequency is 200 GHz. For the time range representation, negative times may
also be entered. The allowed range is –1000 s to +1000 s.
Softkeys of the lines menu
The following table shows all softkeys available in the lines menu. It is possible that your instrument
configuration does not provide all softkeys. If a softkey is only available with a special option, model or
(measurement) mode, this information is delivered in the corresponding softkey description.
Menu / Command Command
Select Traces to check
Deselect All
New Edit Name
Edit Comment
Edit Margin
Value
Insert Value Above
Delete Value
Save Limit Line
Edit same contents as
New Limit Line menu
Copy to same contents as
New Limit Line menu
Delete
To Next Page
Loading...
