Rohde & Schwarz CMW500 Series - Page 149

Remote Control
R&S
®
CMW500
149User Manual 1173.9463.02 ─ 02
Some measurements provide only a subset of values.
Example: in the "GPRF Power" measurement, no user limits are defined and no under-
flow is indicated. The values ULEL, ULEU, and UFL are never returned.
6.4.2.6 Multi Evaluation Measurements
In a multi evaluation measurement, the R&S CMW500 acquires a wide range of mea-
surement results at once.
For example, the GSM multi evaluation measurement provides the most important GSM
mobile transmitter test results described in specification 3GPP TS 51.010:
●
The transmitter output power versus time
●
Results that describe the modulation accuracy: Error vector magnitude (EVM), phase
error, frequency error for each symbol, normalized I/Q vector at and between the
decision points (I/Q constellation, vector and phase diagrams)
●
Results that describe the output RF spectrum: adjacent channel power (ACP) due to
modulation and due to switching, ACP versus time
Multi evaluation measurements offer maximum speed and performance, even if only a
subset of the measurement results is needed. In remote control, it is possible to control
each multi evaluation measurement as a whole but retrieve the different types of results
separately.
Controlling multi evaluation measurements
A multi evaluation measurement is controlled like any other measurement; see Mea-
surement Control. The following commands start, stop and abort a multi evaluation mea-
surement within a particular firmware application (<FWA>):
INITiate:<FWA>:MEValuation
STOP:<FWA>:MEValuation
ABORt:<FWA>:MEValuation
The following commands query the measurement state and the substates:
FETCh:<FWA>:MEValuation:STATe?
FETCh:<FWA>:MEValuation:STATe:ALL?
Example: INITiate:WIMax:MEASurement<i>:MEValuation
Retrieving measurement results
The commands for retrieving the results of a multi evaluation measurement follow general
syntax rules (see Retrieving Measurement Results). In general it is possible to specify
the subset of results needed using an additional <View> mnemonic:
READ:<FWA>:MEValuation:<View>:<Statistics>...?
FETCh:<FWA>:MEValuation:<View>:<Statistics>...?
The result subsets are closely related to the different views that the multi evaluation
measurement provides in manual control.
Control of the Instrument