Chapter 7 SCPI
The Measurement subsystems
WCDMA Options Version 6.20
251
:{measProp}:LIMit:LOWer[:DATA]
- sets the lower limit for a specific
measurement
CALCulate:{Statistics} On the results of the last measurement performed, statistic test evaluation can
be used. The related commands are described in this section.
Using limits The question 'do the performance characteristics of a mobile stay within the
limits set by the appropriate specifications' is the core question of all GSM
testing.
The
LIMit subsystem of the 4400 offers a broad range of:
Example
:CALC:GSM:RFTX:PRMS:LIM:UPP 10.0
This command sets the maximum RMS-valued phase error allowed to 10.0. Any
measurement result value exceeding this limit (e.g. 10.01) will result in a violation of
the limits of the RMS-valued phase error measurement.
Syntax
CALCulate:{measProp}:LIMit:LOWer[:DATA]
Description
Sets the lower limit for the limit check of the measurement specified with the
{measProp}; command element. The lower limit is the minimum measurement result
allowed. Any measurement result value falling below the value set with this com-
mand will result in a violation of the lower limit.
Example
:CALC:AFAN:SIN:LIM:LOW 25.5
This command sets the minimum SINAD required in order to pass the test to 25.5.
Any measurement result value falling below this limit (e.g. 25.4) will result in a viola-
tion of the limits of the RMS-valued phase error measurement.
NOTE
The commands described in this section will be reset with any new
MEASure
command. Therefore, the commands described below will only deliver the sta-
tistic evaluation of the measurement started last.
Syntax
CALCulate:{Statistics}?
Parameters
{Statistics} is one command element out of the following list: MAVerage |
MMAXimum | MMINimum
Returns
A floating point real number representing the result of the related statistic evalua-
tion, performed on all available results of the measurement started last.
Description
Calculates and returns the specified statistical property referring to the most recent
measurement.
Examples
MEASure:GSM:ARRay:RFTX:ALL 10
MEASure:GSM:ARRay:RFTX:PPEAk 10
CALCulate:GSM:MMINimum?
The first command takes 10 measurements of all RFTX parameters (190 then all
together); the second one takes ten measurements of the peak phase error.
The CALC:MMIN? command will only deliver back the minimum result of the peak
phase error measurement as this was the measurement started last.
The value delivered back in the result string is "5.05" in this example.
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