Rohde & Schwarz CMU-K20, Operating Manual

Page: 118 / 646

Non Signalling: Modulation Measurements CMU-K20/K21/K22/K23/K24
1115.6088.12 4.40 E-11
Measurement
configuration
Pressing the Ext. Phase Err. GMSK softkey twice opens the popup menu
Modulation Configuration (see page 4.50 ff.). Besides, the hotkeys Repetition, Stop
Condition, and Statistic Count defining the scope of the measurement and the Trig.
Slot Offset hotkey are associated to the Ext. Phase Err. GMSK softkey. The
function of these hotkeys is explained in the Power menu section (see section P/t
Normal GMSK on page 4.11 f.); they are identical with the parameters set in the
Control t ab of the Modulation Configuration menu (see page 4.50 ff.).
The Ext. Phase Err. GMSK hotkey bar contains two additional hotkeys:
Disp. Mode
The Disp. Mode hotkey selects one of the following display modes:
Current Measured value for current burst
Minimum/Maximum Extreme value of a number of bursts
Average Average value of a number of bursts
See section Measurement Control (Modulation Configuration – Control) on
page 4.50 ff.
Remote control
No display mode set explicitly, the three measurement curves are accessible via
FETCh:ARRay:MODulation:XPERror[:GMSK][:BURSt]
[:CURRent]?
FETCh:ARRay:MODulation:XPERror[:GMSK][:BURSt]:MMAX?
FETCh:ARRay:MODulation:XPERror[:GMSK][:BURSt]
:AVERage?
etc.
Decode
The Decode hotkey defines whether or not guard or tail bits are decoded.
See section Measurement Control (Modulation Configuration – Control) on
page 4.50 ff.
Remote control
CONFigure:MODulation:XPERror[:GMSK]:TIME:DECode
STANdard | GTBits
Application
The Application softkey selects the modulation scheme. Only one application of the
Modulation menu is related to GMSK modulated signals. The 8PSK applications
are described in section Test Settings on p. 4.45 f.
Phase Err.
GMSK
The Phase Error GMSK hotkey selects the extended phase error measurement on
GMSK modulated signals.
Remote control
The
Phase Error GMSK application is selected by the keywords
XPERror[:GMSK]
in the 3
rd
and 4
th
level of the
MODulation
commands, e.g.
CONFigure:MODulation:XPERror[:GMSK]...
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