R&S
®
CMW 500 Remote Control
Control of the Instrument
Operating Manual 1202.3986.32 – 03 91
FETCh...? and READ...? queries.
e.g. FETCh:GPRF:MEASurement<i>:EPSensor:CURRent?
Response: 0, 10.22, 10.15, 10.01, 10.29, 100 (reliability: 0, 5 numeric measurement
values)
In the present firmware version, the common reliability indicator is always set to zero.
5.4.5 Multi-Evaluation Measurements
In a multi-evaluation measurement, the R&S CMW 500 acquires a wide range of
measurement results at once. For example, the GSM multi-evaluation measurement
provides the most important GSM mobile transmitter test results described in standard
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
Measurement Control. The following commands start, stop and abort a multi-evaluation
measurement 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:GSM: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[:SCALar]:<View>:<Statistics>...?
READ:<FWA>:MEValuation:TRACe:<View>:<Statistics>...?
FETCh:<FWA>:MEValuation[:SCALar]:<View>:<Statistics>...?
FETCh:<FWA>:MEValuation:TRACe:<View>:<Statistics>...?
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