Rohde & Schwarz CMU-K20, Operating Manual

Page: 45 / 646

CMU-K20/-K21/-K22/-K23/-K24 Non Signalling Mode
1115.6088.12 2.11 E-10
Additional Information... Alternative Settings
and Measurements
... on Step 4
"
Softkeys and hotkeys
To enlarge the diagram area of the graphical measurement
menus the left softkey column is suppressed. The functional-
ity of each softkey on the right side is extended by hotkeys
assigned to the softkeys. These hotkeys are displayed
across the hotkey bar below the diagram when the softkey is
selected.
Some of the softkey/hotkey combinations offer settings that
can be also accessed via configuration menus. For example,
the
Analyzer Level settings are equivalent to the settings in
the Input Level and Trigger section in the Analyze r tab of the
Connection Control menu. Identical settings overwrite each
other; the last value entered is valid for the whole function
group and test mode.
'
chapter 4, p. 4.9 ff.
The Analyzer Level softkey con-
figures the input level and exter-
nal attenuation as well as the
trigger settings.
The Analyzer Settings softkey
determines which kind of RF sig-
nal can be analyzed.
The Generator Settings softkey
determines the RF signal gener-
ated.
#
Markers
Markers are a graphical tool used to locate points on a trace
and read out their coordinates. A reference marker and two
delta markers may be defined in the
Power menu.
The reference marker measures the absolute level of the
trace, the delta markers and measure the absolute level
or (if set to relative) the distance between their position and
the reference marker.
The Marker/Display softkey sets
markers and D-lines and deter-
mines the display area.
'
chapter 4, p. 4.9 ff.
In addition to markers, a D-line
can be used to measure a par-
ticular level in the diagram.
... on Step 5
$
Display mode
If the measurement extends over several bursts the CMU
calculates four different traces one of which can be selected
in the
Display Mode field. The purpose of the four traces is to
give an overview of the range and arithmetic mean of the lev-
els detected at any point on the time axis. The following
traces can be displayed:
Current Current burst level
Maximum Maximum of all burst levels measured
Minimum Minimum of all burst levels measured
Average Weighted average of all burst levels measured,
see averaging prescription in chapter 3.
The Statistic Count input field defines how many evaluation
periods form a statistics cycle. For GSMxxx-MS Non Signal-
ling measurements an evaluation period is equal to the
propagation time of a normal burst (this definition holds even
if a continuous carrier signal is transmitted). In our example
the statistics cycle comprises 100 bursts (default value).
'
chapter 3.
To refine the statistical evalua-
tion, a suitable combination of the
statistic count, repetition mode,
stop condition and display mode
can be selected.
'
chapter 4, p. 4.28 ff.
In addition to the Power/t Norm.
GMSK measurement, several test
applications assessing the behav-
ior of the average burst power
over several timeslots
(P/Slot
Graph, P/Slot Table) or frames
(P/Frame) can be selected (soft-
key Application) .
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