Chapter 7 SCPI
The Measurement subsystems
248 WCDMA Options Version 6.20
Reading the basic scheme – First, the limits of the measurements to be performed are set (not shown in
the basic scheme).
– After a call has been established, the CALCulate subsystem is reset using the
:CALCulate:RESet command. Only measurements started after this
command will be taken into account for the statistic evaluation. Any results
from previously started (and still running) measurements will be ignored as
well as all existing measurement results.
– The CALCulate subsystem of the 4400 allows to perform a cumulative check
of the measurement results of a measurement. This means that all measure-
ment results obtained (since the last reset of this part of the subsystem) will
be checked against the corresponding limits.
This cumulative check is reset as well in the example shown above with the
:CALCulate:LIMit:FAIL:CUMulative:RESet command.
For further details, check with section “CALCulate:LIMit” on page 249.
– Then, two measurements are started in this example (commands
:MEASure:ARRay:RFTX:LENGth? 10 and
:MEASure:ARRay:RFTX:PRMS? 10).
– As soon as the measurements have been completed, the CALCulate
subsystem is used to identify the minimum and maximum measurement
result value and to calculate the average measurement result value. Please
note that these commands will work only on the results of the measurement
started last (the RMS-valued phase error in this example).
–The command
:CALCulate:LIMit:FAIL:LAST? will return a boolean
number, indicating whether the last measurement of the RMS-valued phase
error was within the limits set (then a
0 will be returned) or whether it was
off the limits (then a
1 will be returned.)
To Next Page
Loading...
