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Non Signalling: Modulation Measurements
CMU-K20/K21/K22/K23/K24
1115.6088.12 4.50
E-11
Remote control
READ[:SCALar]:MODulation:EVMagnitude:EPSK
etc.
CALCulate[:SCALar]:MODulation:EVMagnitude:EPSK
:LIMit:MATChing?
Traces (arrays)
The continuous trace in the test diagram shows the measured quantity as a
function of time (in symbols). The display mode
(Current, Max./Min., Average)
for
the trace is indicated in the upper right corner of the diagram.
The measurement curve comprises the whole useful part of the normal burst
(symbol 0 to 146 ¾). The curve is derived from 588 equidistant measurement
points with a ¼ symbol spacing. The y-axis range is fixed for any of the three
measured quantities (applications):
0 % to +20 %
for the error vector magnitude
–20 % to +20 %
for the magnitude error
–20 deg to +20 deg
for the phase error
The red, horizontal lines in the test diagram mark the tolerance range of the
measured quantities as set in the
Limits
tab of the
Modulation Configuration
menu
(see p.
4.52
ff).
Remote control
READ:ARRay:MODulation:EVMagnitude:EPSK:CURRent?
etc.
Measurement Configurations (Modulation Configuration)
The popup menu
Modulation Configuration.
contains two tabs to determine the parameters of the
phase and frequency error measurement including the error tolerances.
The popup menu
Modulation Configuration
is activated by pressing the measurement control softkey
(labeled
Ext. Phase Err. GMSK, Overview 8PPSK, ...
depending on the modulation scheme and
application selected)
in the top right of the graphical measurement menu
Modulation
twice. By pressing
the associated hotkeys, it is possible to change between the tabs.
Measurement Control (Modulation Configuration – Control)
The
Control
tab controls the
Modulation
measurement by defining
•
The
Repetition
mode
•
The
Stop Condition
for the measurement
•
The measurement curve displayed
(Display Mode
, not for application
Overview 8PSK)
•
The number of bursts/evaluation periods forming a statistics cycle
(Statistic Count)
,
•
The decoding rule for guard and tail bits
(Decode
, for GMSK modulation only)
•
The averaging rule to obtain the reference power
(Ref. Power Mode
, for
8PSK
measurements only)
Besides, it influences the graphical measurement menus by adding or removing the
Grid
.
深圳德标仪器
135-1095-0799
Содержание CMU-K20
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