Rigol DG4000 Series

[:SOURce<n>]:MOD:FM:SOURce
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Syntax
[:SOURce<n>]:MOD:FM:SOURce INTernal|EXTernal
[:SOURce<n>]:MOD:FM:SOURce?
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Description
Set the FM modulation source to INTernal or EXTernal.
Query the FM modulation source.