Appendix A
SCPI Command Reference
MEASure subsystem
538
4460 GSM System Option and 4468 EDGE System Option
Version 12.20
:MEASure:EGPRs[:CONTinuous]:RFSPectrum:ACPM:
MODPower
Description
Starts a continuous measurement of the ACPM modulation spectrum. To read out the
latest measurement results, use the
:FETCh:EGPRs:RFSP:ACPM:MOD
command.
Note:
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. If one
includes the carrier frequency as well (0.0 dBc), this adds up to the 23 measurement
values returned. All measurements will be performed with a measuring bandwidth of
30 kHz.
Query
The query form of this command starts the measurement and delivers a string, con-
taining 23 measurement result values separated by commas. These 23 measurement
result values are floating point real numbers with the physical dimension dBc (dB rel-
ative to the carrier, being the transmission frequency of the mobile). The 23 values
represent the power in a 30 kHz bandwidth at the following frequencies: -1.8 MHz, -
1.6 MHz, -1.4 MHz, -1.2 MHz, -1.0 MHz, -800 kHz, -600 kHz, -400 kHz, -250 kHz, -
200 kHz, -100 kHz, 0 kHz, +100 kHz, 200 kHz, 250 kHz, 400 kHz, 600 kHz, 800 kHz,
1.0 MHz, 1.2 MHz, 1.4 MHz, 1.6 MHz, 1.8 MHz.
Example
:MEAS:EGPRs:CONT:RFSP:ACPM:MODulation?
In this case, a measurement of the modulation spectrum will be performed. As soon
as the measurement has been completed, a string will be delivered back containing
23 floating point real numbers.
Syntax
:MEASure:EGPRs[:CONTinuous]:RFSPectrum:ACPM:MODPower
Parameters
There are no parameters.
Description
Starts a continuous measurement of the ACPM modulation spectrum. To read out the
latest measurement results, use the
:FETCh:EGPRs:RFSP:ACPM:MODP
com-
mand.
Notes:
–
The first result is the absolute power in dBm, measured at the center frequency.
The remaining 23 values are the same as in 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. If
one includes the carrier frequency as well (0.0 dBc), this adds up to the 23 mea-
surement values returned. All measurements will be performed with a measuring
bandwidth of 30 kHz.
Query
The query form of this command starts the measurement and delivers a string, con-
taining 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 measurement
result values, all separated by commas. These 23 measurement result values are float-
ing point real numbers with the physical dimension dBc (dB relative to the carrier,
being the transmission frequency of the mobile). The 23 values represent the power in
a 30 kHz bandwidth at the following frequencies: -1.8 MHz, -1.6 MHz, -1.4 MHz,
- 1.2 MHz, -1.0 MHz, -800 kHz, -600 kHz, -400 kHz, -250 kHz, -200 kHz, -100 kHz,
0 kHz, +100 kHz, 200 kHz, 250 kHz, 400 kHz, 600 kHz, 800 kHz, 1.0 MHz, 1.2 MHz,
1.4 MHz, 1.6 MHz, 1.8 MHz.
