Instrument Function
R&S
®
SMU200A
318Operating Manual 1007.9845.32 ─ 15
This information is needed by the user, for example, in order to use the I/Q signal exter-
nally and to adjust the level correctly there, or to see how the signal is modulated.
Up to baseboard version DacBoard 1141.8090.xx the calculated signal levels are dis-
played. From “DacBoard 1141.8190.02” or higher monitoring the measurement with or
without interfering is provided.
Information on the baseband I/Q signal during measurement is indicated in the section
"Baseband Signal Level Measurement". Level, crest factor and duration of the measure-
ment can be displayed for the signal either with or without interfering.
Monitoring the measurement of the digital I/Q baseband signal requires the baseboard
version “DacBoard 1141.8190.02” or higher. Up to baseboard version DacBoard
1141.8090.xx only the calculated signal levels are provided.
The currently equipped DacBoard is listed in the dialog "Setup > System > Hardware
Config, section Baseband Assembly" (see chapter 5.2.3.2, "Hardware Config",
on page 130).
To open the "Info..." dialog for information on the baseband I/Q signal during measure-
ment, select "AWGN/IMP > Configure > Info" or use the MENU key under "AWGN/
IMP".
5.7.4.1 Baseband Signal Level
The signal levels and the crest factor of the baseband signal at the I/Q output connectors
are indicated in the dialog box "Baseband Signal Level".
Crest Factor - Digital Impairments
Indicates the crest factor of the baseband signal.
The crest factor is calculated from the two level parameters as follows:
Impairment of Digital I/Q Signal and Noise Generator - AWGN/IMP Block
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