R&S ESR Series User Manual page 217

®
R&S ESR
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 display:
●
D1: Display Line 1
●
D2: Display Line 2
●
F1: Frequency Line 1
●
F2: Frequency Line 2
●
T1: Time Line 1
●
T2: Time Line 2
5.4.3.3 Limit Lines (Frequency/Time 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.
Which softkeys are available depends on the display mode (frequency or time range).
For details see also
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 excep-
tion of dB based units; all dB based units are compatible with each other.
At the time of entry, the R&S ESR immediately checks that all limit lines are in accord-
ance 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 ESR. A
limit line may also exceed the specified frequency or time range. The minimum fre-
quency for a data point is -200 GHz, the maximum frequency is 200 GHz. For the
User Manual 1175.7068.02 ─ 12
Chapter 5.4.3.5, "Selecting a Limit
Receiver Mode
Common Analysis Functions
Line", on page 215.
214