Rohde & Schwarz CMU-K20, Operating Manual

Page: 123 / 646

CMU-K20/K21/K22/K23/K24 Non Signalling: Modulation Measurements
1115.6088.12 4.45 E-11
The I/Q imbalance is measured for GMSK-modulated signals only.
Fig. 4-19 Measurement menu Modulation – Overview 8PSK
Test Settings
The Analyzer Level, Analyzer Settings, Generator, and Menus test settings are identical with those in
the Power menu (see section Test settings on page 4.9 ) . The Overview 8PSK measurement control
softkey (which changes to EVM 8PSK, Magn. Error 8PSK, or Phase Error 8PSK if the corresponding
application is selected) is analogous to the Ext. Phase Err. GMSK softkey described in section Test
Settings on page 4.39 . With 8PSK modulation, the Application softkey provides the following
applications:
Application
The Application softkey selects the measurement application and the modulation
scheme. Several applications of the Modulation
menu are related to 8PSK
modulated signals. The GMSK application is described in section Test Settings on
p. 4.39 f.
Overview
8PSK
The Overview 8PSK hotkey selects all scalar modulation results to be displayed.
For an explanation of the measured quantities see section Measurement Menu
(Modulation – 8PSK) on page 4.42 .
Remote control
No explicit switchover command. All
Overview 8PSK measurements are identified
by the 3
rd
/4
th
level keywords
...OVERview:EPSK...
EVM
8PSK
The EVM 8PSK hotkey selects the magnitude of the error vector to be displayed.
The error vector connects the measured signal from the mobile station and the
ideal signal vector at the symbol points, see explanation in section
Measurement
Menu (Modulation – 8PSK) on page 4.42 . The diagram shows the relative
magnitude (in percent), i.e. the ratio of the magnitude of the error vector to the
magnitude of the ideal signal vector.
Remote control
No explicit switchover command. All
EVM 8PSK measurements are identified by
the 3
rd
/4
th
level keywords
...EVMagnitude:EPSK...
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