Appendix A
SCPI Command Reference
MEASure subsystem
4460 GSM System Option and 4468 EDGE System Option
Version 12.20
527
:MEASure:EGPRs:ARRay:RFSPectrum:ACPM:TRANsient
Description
Performs the measurement of the ACPM modulation spectrum a specific number of
times (set with the int1 parameter). To read out the entire measurement results array,
use the
:FETCh:EGPRs:RFSP:ACPM:MODP
command.
Notes:
–
The first result is the absolute power in dBm, measured at the center frequency.
The remaining 23 values are the same as from the ACPM:MODulation command.
–
According to GSM specification 05.05, this measurement will be performed on
(±)100 kHz and (±)250 kHz offset from the carrier as well as on all multiples of
200 kHz offset from the carrier up to (and including) an offset of (±)1.8 MHz.
Including the carrier frequency (0.0 dBc), this adds up to the 23 measurement val-
ues returned. All measurements will be performed with a measuring bandwidth of
30 kHz.
More information regarding
ARRay
measurements can be found in section
:MEASure:ARRay
.
Query
The query form of this command will perform the measurement the specified number
of times (
int1
parameter). As soon as all measurements have been completed, all
measurement result values will be returned in a string. The string delivered back will
contain the absolute power at the center frequency (within a 30 kHz bandwidth) as
the first value with the physical dimension of dBm and after that 23 floating point
real numbers with the physical dimension dBc. The total count of the values is 24 *
int1
.
The individual measurement results are separated by commas.
Example
:MEAS:EGPRs:ARR:RFSPectrum:ACPM:MODPower 5
:FETCh:EGPRs:RFSP:ACPM:MODP?
The string returned in this example would contain 120 floating point real numbers,
representing the 24 measurement result values of five measurement runs.
Syntax
:MEASure:EGPRs:ARRay:RFSPectrum:ACPM:TRANsient <int1>
Parameters
int1
is an integer.
The minimum value for
int1
is
0
, the maximum value is
100
. The default value for
int1
is
0
.
Description
Performs the measurement of the ACPM spectrum due to switching transients a spe-
cific number of times (set with the int1 parameter). To read out the
entire
measure-
ment results array, use the
:FETCh:EGPRs:RFSP:ACPM:TRAN
command.
Note:
According to GSM specification 05.05, this measurement will be performed on
0, (±)400, (±)600, (±)1.200 and (±)1.800 kHz offset from the carrier. All measure-
ments will be performed with a measuring bandwidth of 30 kHz. For additional infor-
mation, also the measurement values of the adjacent 30 kHz windows below and
above the frequencies given above will be delivered back. This adds up to 9 x 3 = 27
measurement result values, that are returned per measurement run.
More information regarding ARRay measurements can be found in section
:MEASure:ARRay
.
Query
The query form of this command will perform the measurement the specified number
of times (
int1
parameter). As soon as all measurements have been completed, all
measurement result values will be returned in a string. The string delivered back will
contain (27 *
int1
) floating point real numbers. The physical dimension is dBm.
The single measurement results are separated by commas.
