📄 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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<P><SPAN class=title1>User Defined Duty Cycle for a Square
Wave Output Using the DDS Operation Mode for NI 5401, NI 5411,
or NI 5431</SPAN> </P></TD></TR><!--stopindex-->
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<P>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%.<BR><BR>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.<BR></P></TD></TR></TBODY></TABLE>
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<TD class=tableheader colSpan=3><STRONG>Software
Requirements</STRONG></TD></TR>
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<TD vAlign=top noWrap width=180><STRONG>Application
Software:</STRONG> </TD>
<TD width="100%">LabVIEW Professional Development System
7.1<BR></TD></TR>
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<TD vAlign=top><STRONG>Toolkits and Add-ons:</STRONG></TD>
<TD></TD></TR>
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<TD vAlign=top><STRONG>Additional Software:</STRONG> </TD>
<TD></TD></TR>
<TR>
<TD><IMG height=1
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<TD vAlign=top><STRONG>Language(s):</STRONG></TD>
<TD>LabVIEW</TD></TR>
<TR>
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<TD class=tableheader colSpan=3><STRONG>Hardware
Requirements</STRONG> </TD></TR>
<TR>
<TD class=linebuffer vAlign=bottom colSpan=3>
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<TBODY>
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