Rohde & Schwarz CMU-K20, Руководство по эксплуатации

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Non Signalling: Power Measurements CMU-K20/K21/K22/K23/K24
1115.6088.12 4.22 E-11
Measurement
curves (arrays) The measurement result is displayed as a continuous measurement curve in the
test diagram together with the limit lines, markers and the D-line, if defined. The
curve is derived from 668 equidistant measurement points with a ¼ symbol spacing
covering a time range between –10 symbols and 156 ¾ symbols.
The measurement curve in the Power measurement menu shows the measured
burst power (in dB) as a function of time (in symbol periods). The displayed result
depends on various test settings. The display mode for the measurement curve
(Minimum, Maximum, Average, Current) is indicated in the upper right corner of the
diagram.
The scale of both axes can be adjusted via the Display Area hotkey (see section P/t
Normal GMSK on p. 4.20 ).
Remote control
READ:ARRay:POWer[:NORMal][:GMSK]...?
FETCh:ARRay:POWer[:NORMal][:GMSK]...?
SAMPle:ARRay:POWer[:NORMal][:GMSK]...?
Limit Check
The result of the limit check is visualized in two colored bars below the diagram. In
each area of the burst, the upper (lower) bar turns red if the result exceeds (falls
below) the power/time template defined in the
Limit Lines tab of the Power
Configuration menu.
Remote control
CALCulate[:SCALar]:POWer[:NORMal][:GMSK]:LIMit:MATChing...?
b) P/t Normal 8PSK
As shown in Fig. 4-5 below, the P/t Normal 8PSK measurement results are similar to the P/t Normal
GMSK results. The x-axis scale of both diagrams is equal because 8PSK and GMSK symbol periods
are of equal length. The following differences occur:
•
The default limit lines differ from the GMSK limit lines.
See explanation of GSM burst structure and power/time templates in section Limit lines (Power
Configuration – Limit Lines) on page 4.32 ff.
Parameter line 1, 2
Test diagram
Info box
Fig. 4-5 Display of results (Power – P/t Norm. 8PSK)
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