Common Analysis and Display Functions
R&S
®
FSW
524
User Manual 1173.9411.02 ─ 19
7.5.1 Basics on Display Lines
Display lines help you analyze a trace – as do markers. The function of a display line is
comparable to that of a ruler that can be shifted on the trace in order to mark absolute
values. They are used exclusively to visually mark relevant frequencies or points in
time (zero span), as well as constant level values. It is not possible to check automati-
cally whether the points are below or above the marked level values - use limit lines for
that task (see
chapter 7.5.2, "Basics on Limit Lines"
Two different types of display lines are provided:
●
Two horizontal level lines for marking levels – Display Line 1 and 2
The level lines are continuous horizontal lines across the entire width of a diagram
and can be shifted in y direction.
●
Two vertical frequency or time lines for marking frequencies or points in time – Fre-
quency/Time Line 1 and 2
The frequency or time lines are continuous vertical lines across the entire height of
the diagram and can be shifted in x direction.
Lables
Each line is identified by one of the following abbreviations in the diagrams:
●
D1: Display Line 1
●
D2: Display Line 2
●
F1: Frequency Line 1
●
F2: Frequency Line 2
●
T1: Time Line 1
●
T2: Time Line 2
7.5.2 Basics on Limit Lines
Limit lines are used to define amplitude curves or spectral distribution boundaries in
the result diagram 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). When transmitting information in TDMA systems (e.g. GSM), the
amplitude of the bursts in a time slot 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 R&S
FSW supports limit lines with a maximum of 200 data points. Eight 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 storage device used.
Compatibility
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.
Display and Limit Lines
