Chapter 7 SCPI
The Measurement subsystems
WCDMA Options Version 6.20
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The CALCulate Subsystem The CALCulate subsystem performs statistic evaluation of measurement results
and also allows to check results against user-definable limits.
The basic scheme outlined below gives an idea of how to work with the CALCu-
late subsystem and to use the single queries as branching decisions within a
program flow.
Examples
MEASure:GSM:RFTX:ALL
The result of this command will be that the 4400 continuously measures all RFTX
parameters.
To read out the 19 measurement result values, use the
FETCh:GSM:RFTX:ALL?
command. It will deliver back all measurement results contained in a string. This
command may be used repeatedly (as long as the corresponding MEASure command
was not terminated by another MEASure command.
MEASure:GSM:ARRay:RFTX:PPEAk 10
This command will start the measurement of the peak phase error. As soon as
10 measurement results have been obtained, the measurements will be stopped.
To read out the 10 measurement results, use the
FETCh:GSM:RFTX:PPEAk?
The string delivered back contains the 10 measurement results, starting from the first
one (the oldest).
MEASure:GSM:ARRay:RFTX:PPEAk? 10
Unlike the example above, this command will start the measurement of the peak
phase error. As soon as 10 measurement results have been obtained, those results will
be given back in a string and the measurements will be stopped.
Any
FETCh:GSM:RFTX:PPEAk?
command will lead to a timeout as there are no new measurement results to be col-
lected.
NOTE
Statistic evaluations on measurable properties like average, minimum or max-
imum will only be performed on the type of measurement started last (i.e. the
PRMS measurement in the example below).
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