Rohde & Schwarz CMU-K20, Руководство по эксплуатации

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CMU-K20/-K21/-K22/-K23/-K24 Measurement Control
1115.6088.12 5.5 E-10
Measurement Statistics
The repetition mode defines how many evaluation periods are measured if the measurement is not
stopped explicitly (measurement control commands
STOP..., ABORT...
) or by a limit failure. With
remote control the three repetition modes Single Shot, Continuous and Counting are available ( Count-
ing is not available in manual control, see chapter 3).
In
POWer, MODulation,
and
SPECtrum
measurements, different traces corresponding to the result in
the current period, the maximum, minimum, or average evaluated over a set of periods are determined
within one measurement. The four results can be queried independently.
Table 5-2 Repetition mode in remote control
Setting Description Command
Statistic Count
Integer number of evaluation periods
forming one statistics cycle. An evalua-
tion period is equal to a burst length
(POWer | MODulation | SPEC-
trum)
or a frame
(RXQuality
meas-
urements).
The statistic count is set together with
the measured quantity.
CONFigure:<meas_obj>:CONTrol
SCALar | ARRay,
1 ... 1000 | NONE
(<meas_obj> = POWer... | MODulation... |
SPECtrum... etc., see
Table 5-1
)
CONFigure:RXQuality:BER<nr>|BAVerage:CONTrol
<Mode>,
1 ... 50000 | NONE
Repetition mode
Single Shot
The measurement is stopped after one
statistics cycle.
CONFigure:<meas_obj>:CONTrol:REPetition
SINGleshot , <StopCondition>, <Stepmode>
(<meas_obj> = WPOWer | POWer... | MODula-
tion... | SPECtrum...)
CONFigure:RXQuality: BER <nr>:...
Continuous The measurement is continued until
stopped explicitly or by a limit failure.
Average values are calculated according
to the formulas in chapter 3, section
"
General Settings ".
CONFigure:<meas_obj>:CONTrol:REPetition
CONTinuous , <StopCondition>, <Stepmode>
(<meas_obj> = WPOWer | POWer | MODulation |
SPECtrum:MODulation, SPECtrum:SWITching)
CONFigure:RXQuality: BAVerage :...
Counting Repeated single shot measurement with
configured statistics cycles. The calcula-
tion of statistical quantities (minimum,
maximum, average) is restarted after
each statistics cycle; each cycle is
treated as an independent single shot
measurement.
CONFigure:<meas_obj>:CONTrol:REPetition
1 ... 10000 , <StopCondition>, <Stepmode>
(<meas_obj> = WPOWer | POWer... | MODula-
tion... | SPECtrum...)
This mode is not available for
RXQuality
measurements. A
counting measurement with 1 evaluation period is equivalent
to a single shot measurement..
Traces The specifiers
CURRent, MAXimum,
MINimum, MMAX,
and
AVERage
de-
note the traces for the current evaluation
period, the maximum, minimum, extreme
value, or average of a set of evaluation
periods. They correspond to the
Display
Mode set in the measurement configura-
tion menus.
In general all four traces are evaluated
during the measurement. They are se-
lected via a keyword in the queries initi-
ating a measurement and retrieving the
results.
Measurement results:
READ:ARRay:<meas_obj>[:RESult]<disp>?
....
where
<meas_obj> = POWer... | MODulation...|
SPECtrum...
Burst matching:
CALCULATE:<meas_obj>[:RESult]:
LIMit:MATChing<disp>?
....
where
<disp> = [:CURRent] | :AVERage |
| :MMAXimum | :MAXimum | :MINimum
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