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📄 user defined duty cycle for a square wave output using the dds operation mode for ni 5401, ni 5411, or ni 5431 - example - development library - national instruments.htm

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content="When outputting a signal using DDS mode, a 16,384 point array, which represents the waveform, is loaded into the DDS buffer. The Configure Standard Waveform function in NI-FGEN has a 'waveform' input which automatically creates an array representing a standard waveform and loads this array into the DDS buffer. When 'square' is selected as the waveform input to this function, the square wave loaded into the buffer has a duty cycle of 50%.&#13;&#10;  &#13;&#10;If you want to output a square wave with a duty cycle other than 50%, you must create and load the raw data corresponding to this waveform into the DDS buffer manually. The following example demonstrates how to create the square wave with the desired duty cycle in LabVIEW and then demonstrates how to load this data into the DDS buffer for output.&#13;&#10;" 
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