Rohde & Schwarz CMU-K20, Operating Manual

Page: 113 / 646

CMU-K20/K21/K22/K23/K24 Non Signalling: Power Measurements
1115.6088.12 4.35 E-11
Note: The CMU treats the areas where the lower limit lines are switched on as the useful part of
the burst; the remaining areas form the guard period. The tester calculates the multislot
tolerance template from the single-slot limit lines and the
Multislot Guard level (see below)
and normalizes it to the average RF carrier power in the useful part of the Meas. Timeslot.
This implies that the tolerance template is changed if the useful part of the burst is
extended by enabling an additional lower limit area.
In remote control the exact current position of the multislot template can be queried with
the
[SENSe:]ARRay:POWer:MSLot:AREA:LIMit...?
commands.
The
Limit Lines tab provides:
•
A preview of the default limit lines showing the different areas (Area Info)
•
Definition of the limit lines for the normal burst area by area (Upper Limit Line, Lower Limit Line)
Fig. 4-14 Power Configuration – Limit Lines
Default Settings
The Default All Settings switch assigns default values to all settings in the Limits tab
(the default values are quoted in the command description in chapter 6 of this
manual). In addition, default switches for the individual modulation schemes are
provided.
Remote control
CONFigure:POWer[:NORMal][:GMSK]:LIMit:LINE:DEFault ON | OFF
Area Info
The Area Info diagram represents a simplified preview of the defined tolerance
template.
Remote control
–
Upper Limit Line The table Upper Limit Line defines the upper limit lines for normal bursts. The
normal burst can be divided into up to 16 areas (Area 1 to Area 16) ; within an area,
the limit line represents a line section with arbitrary (even infinite) slope. In all
areas, the static limit lines can be corrected (shifted) by adding an (optional)
dynamic (i.e. template PCL-dependent) correction. The CMU's power template is
thus far more flexible than the GSM template shown above.
Dynamic Template Enable (On) or disable (Off) the dynamic limit line correction
for the entire upper limit line. With disabled dynamic limit line correction the upper
limit line is equal to the upper
Static limit line.
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