CMU Audio Generator and Analyzer (Option CMU-B41)
1100.4903.12 4.85 E-10
Multitone Measurement
The graphical measurement menu Multitone shows the results of the multitone audio measurement.
To perform an Multitone measurement, the CMU generates a composite audio signal that represents the superpo-
sition of up to 20 individual fixed-frequency tones with configurable frequency and level. An audio signal containing
the same tones can be analyzed in a single measurement and displayed in a bar chart.
The Multitone measurement is thus a fast method to determine the level of up to 20 different tones at known fre-
quencies and to perform a limit check for all results. Possible applications are also frequency response and inter-
modulation measurements.
The main softkey AF Chan. One, which changes to AF Chan. Two if the corresponding application is
selected, controls the Multitone measurement, indicates its status (RUN | HLT | OFF) and opens the
configuration menu Multitone Configuration (press twice). The hotkeys associated to the main soft-
key define the scope of the Multitone measurement.
The other softkeys to the right of the test diagram are combined with various hotkeys (e.g. the hotkeys
AF Max. Level and AF Mode belong to the softkey Analyzer Level). If a softkey is selected and an
associated hotkey is pressed, a popup window will appear which indicates the current setting and
enables an entry (for an example, see section Test settings on page 4.40 ff.).
The measurement menu Multitone is opened via the main menu Menu Select (with the associated key
at the front of the instrument) or from the Analyzer/Generator menu using the Multitone hotkey.
Menu SelectMenu Select
Fig. 4-39 Measurement menu Multitone
Test Settings
The Multitone measurement can be configured by means of the softkeys and hotkeys in the graphical
measurement menu.
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