Rohde & Schwarz CMU-K20, Operating Manual

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CMU-K20/K21/K22/K23/K24
Measurement Groups (Non Signalling only)
1115.6088.12 6.21 E-12
Subsystem SUBarrays:POWer
The subsystem SUBarrays:POWer defines the measurement range and the type of output values.
CONFigure:SUBarrays:POWer[:NORMal][:GMSK] Definition of Subarrays
CONFigure:SUBarrays:POWer[:NORMal]:EPSK
<Mode>,<Start>,<Samples>{,<Start>,<Samples>}
<Mode> Description of parameters Def. value Def. unit
ALL |
ARIThmetical |
MINimum |
MAXimum |
IVAL, Return all measurement values
Return arithm. mean value in every range
Return minimum value in every range
Return maximum value in every range
Return single interpolated value at <Start> ALL –
<Start> Description of parameters Def. value Def. unit
–10 bit to 156 ¾ bit, Start time in current range (in bit for GMSK,
symbols for 8PSK modulation) –10 bit
<Samples> Description of parameters Def. value Def. unit FW vers.
1 to 668 Number of samples in current range 668 – V2.00
Description of command
This command configures the
READ:SUBarrays:POWer..., FETCh:SUBarrays:POWer...,
and
SAM-
Ple:SUBarrays:POWer
commands. It restricts the measurement to up to 32 subranges where either all meas-
urement results (the number of which is given by the second numerical parameter) or a single statistical value is
returned. The subranges are defined by the start time and the number of test points which are located on a fixed,
equidistant grid with a step width of ¼ bit. If <Start> does not coincide with a test point then the range will start at
the next test point that is larger than <Start>.
For <Mode> = IVAL, the <Samples> parameter is ignored and the CMU returns a single measurement value
corresponding to the abscissa value <Start>. If <Start> is located between two test points with valid results then
the result is calculated from the results at these two adjacent test points by linear interpolation.
The subranges may overlap but must be within the total range of the POWer measurement. Test points outside
this range are not measured (result NAN) and do not enter into the ARIThmetical, MINimum and MAXimum val-
ues.
By default, only one range corresponding to the total measurement range is used and all measurement values
are returned.
Measured Values – Subsystem POWer
The subsystem POWer determines and returns the results of the signal power measurement. They
correspond to the graphical measurement menu Power with its various display elements.
READ[:SCALar]:POWer[:NORMal][:GMSK]? Scalar results:
READ[:SCALar]:POWer[:NORMal]:EPSK?
Start single shot measurement and return results
FETCh[:SCALar]:POWer[:NORMal][:GMSK]?
FETCh[:SCALar]:POWer[:NORMal]:EPSK?
Read out measurement results (unsynchronized)
SAMPle[:SCALar]:POWer[:NORMal][:GMSK]?
SAMPle[:SCALar]:POWer[:NORMal]:EPSK?
Read out measurement results (synchronized)
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