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

我的程序 请看一下 多谢阿 会有用的

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                <TD vAlign=top noWrap width=180><STRONG>Hardware 
                  Group:</STRONG> </TD>
                <TD width="100%">Signal Source (AWG/FG/AO)</TD></TR>
              <TR>
                <TD><IMG height=1 
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                <TD vAlign=top><STRONG>Model:</STRONG> </TD>
                <TD></TD></TR>
              <TR>
                <TD><IMG height=1 
                  src="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.files/invis.gif" 
                  width=1> </TD>
                <TD vAlign=top><STRONG>Driver:</STRONG> </TD>
                <TD>NI-FGEN 2.2<BR></TD></TR>
              <TR>
                <TD><IMG height=1 
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                  width=1> </TD>
                <TD vAlign=top><STRONG>Additional Hardware:</STRONG> </TD>
                <TD>NI 5401, NI 5411, or NI 5431<BR></TD></TR>
              <TR>
                <TD colSpan=3><IMG height=3 
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                <TD class=tableheader colSpan=4><STRONG>Download 
                  Example</STRONG></TD></TR>
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                  width=1></TD></TR>
              <TR>
                <TD>&nbsp; </TD>
                <TD><A 
                  href="ftp://ftp.ni.com/contrib/epd/DD60823465653BC7E034080020E74861/SquareDuty.vi">Download 
                  - SquareDuty.vi</A> </TD>
                <TD>77 kilobyte(s) </TD></TR>
              <TR>
                <TD colSpan=4><IMG height=3 
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              <TR>
                <TD>&nbsp;</TD>
                <TD colSpan=2><STRONG>Please Note:</STRONG><BR>This example 
                  program was developed and tested by a National Instruments 
                  Applications Engineer for technical support purposes. This 
                  code is supported by National Instruments, but may not be 
                  completely tested and verified with each new revision of 
                  related products and drivers.<BR></TD>
                <TD>&nbsp;</TD></TR>
              <TR>
                <TD colSpan=4><IMG height=3 
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