R&S
®
CMW 500 System Overview
Measurements
Operating Manual 1202.3986.32 – 03 51
3.2.6.6 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
Advantages
Compared to independent TX measurements, multi-evaluation measurements provide
several advantages:
They ensure highest measurement speed.
They provide a comprehensive picture of the performance of a tested RF
transmitter with a minimum of effort for configuring the R&S CMW 500.
They provide "linked" results: The different measured quantities are all based on
the same set of raw measurement data.
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 using the
measurement control softkey.
In some multi-evaluation measurements, it is possible to disable part of the results; see
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