Appendix A
SCPI Command Reference
MEASure subsystem
4460 GSM System Option and 4468 EDGE System Option
Version 12.20
531
:MEASure:EGPRs[:CONTinuous]:RFTX:ERMS
Query
The query form of this command starts the measurements and - after all measure-
ments have been completed and all measurement results obtained - delivers a string,
containing 17 measurement result values, separated with commas. The order and
type of these measurement result values delivered back is as follows:
1.
ERMS
, the error vector magnitude rms-averaged over a burst.
EVM
is a relative
value and shown as a percentage,
2.
EPEAk
, the maximum error vector magnitude within a burst.
EVM
is indicated per
cent,
3.
ENFTh
, the error vector magnitude that is not exceeded by 95% of the symbols of
a burst. The 95%
EVM
is shown in %,
4.
EOFFset
, the origin offset indicates the accuracy of the i/Q modulators DC setup;
it is usually an undesire leakage produced due to a DC offset in the phones I/Q modu-
lator. It is measured in dBc,
5.
FREQuency
, floating point real number representing the mobile's frequency
error,
6.
LENGth
, floating point real number representing the length of the burst in micro-
seconds,
7.
UTIMe
, floating point real number representing the timing error of the mobile
under test in microseconds (taking the ordered timing advance into account),
8.
POWer
, floating point real number representing the mobile's RF output power level
in dBm,
9.
TEMPlate
boolean number. A
0
indicates that the power-time template (PTT)
was
not
violated by the last burst measured, while a
1
means that the burst did vio-
late the PTT.
10...17.
CORNer
, eight floating point real numbers, representing the RF power level
in dBm at eight predefined positions of a burst.
Example
:MEASure:EGPRs:CONTinuous:RFTX:ALL?
In this case, all relevant EGPRS RF TX measurements will be performed in a sequence.
As soon as all measurements have been completed and all measurement results
obtained, a string will be delivered back containing 17 measurement results:
"
5.13,11.94,2.43,4.55,-2.22,557.0,0.1,11.22,0,-72.18, -
61.91,-20.91,-0.05,-0.04,-17.97,-56.60, -73.95
".
Syntax
:MEASure:EGPRs[:CONTinuous]:RFTX:ERMS
Parameters
There are no parameters.
Description
Starts a continuous measurement of the error vector magnitude rms-averaged over a
burst. EVM is a relative value and shown as a percentage. To read out the measure-
ment results, use the
:FETCh:EGPRs:RFTX:ERMS
command.
Query
The query form of this command will start the measurement and return a measure-
ment result value as soon as the first measurement has been completed. The string
delivered back will contain one floating point real number with the physical dimen-
sion of %.
Example
:MEAS:EGPRs:RFTX:ERMS
:FETC:EGPRs:RFTX:ERMS?
The error vector magnitude rms-averaged measurement will be performed. The mea-
surement result will be stored internally and read by the <TT>FETC</TT> command.
An example of the string returned is: "
2.33
".
