?? direct digital synthesis (dds) mode (ni 5411-5431) - tutorial - development library - national instruments.htm
字號(hào):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0080)http://zone.ni.com/devzone/conceptd.nsf/webmain/BB463448CB7D014E862568C900714FFB -->
<HTML><HEAD><TITLE>Direct Digital Synthesis (DDS) Mode (NI 5411/5431) - Tutorial - Development Library - National Instruments</TITLE>
<META http-equiv=Content-Type content="text/html; charset=windows-1252"><LINK
href="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/main.css"
type=text/css rel=stylesheet>
<META content=TRUE name=MSSmartTagsPreventParsing>
<META
content="The NI 5411/5431 ARB instruments employ two broad modes for waveform generation. DDS Mode, or Direct Digital Synthesis, is one of these two modes. DDS is a technique for generating, under digital control, an analog frequency source from a single reference clo"
name=description><!-- <meta name="keywords" content=""> -->
<META content=2005-03-20 name=date>
<META content=devzone/devzoneweb.nsf/Opendoc?openagent& name=path><!-- <meta name="product" content=""><meta name="Industry" content=""> -->
<META content=DevZone name=section>
<META content=dzLibrary name=subsection>
<META content=dzConcept name=subsection2>
<META content=Technical name=ContentClass>
<META content=Tutorial name=ContentType>
<META content=English name=Language>
<META content="Direct Digital Synthesis (DDS) Mode (NI 5411/5431)"
name=ShortTitle>
<META content="" name=docType>
<SCRIPT language=JavaScript type=text/javascript><!-- function FormatAndSend(){
var frm = document.search2
var temp = "";
frm.query.value = replaceChars(frm.query.value);
frm.query1.value = replaceChars(frm.query1.value);
if (frm.query1.value=="")
{return false;}
else {
temp = frm.query1.value + "&lang=" + frm.lang.value;
frm.query.value = temp;
return true;
}
}
function replaceChars (textstring) {
// function replaces ampersands with "AND"
tempstring = "";
for (i=0; i < textstring.length; i++) {
tempchar = textstring.charAt(i);
if (tempchar == "&") {
tempstring += "AND";
}
else {
tempstring += tempchar;
}
}
return tempstring;
}// --></SCRIPT>
<SCRIPT language=JavaScript type=text/javascript><!-- function validate(){
var test;
var field1 = document.suppfeed.valueanalysis;
// var field2 = document.suppfeed.comments;
var field3 = document.suppfeed.emailadd;
for(var i=0;i<field1.length;i++){
if (field1[i].checked){
test="test"}
}
// if((field2.value != "Document needs work? Please tell us why.") & (field2.value !="")){
// test = "test"}
for (var i=0;i<field3.length;i++){
if (field3[i].checked){
test="test"}
}
if(test=="test"){
document.suppfeed.submit();
return;}
else {
alert("Please fill out one or more fields before clicking the Submit button.");
return;}
}
// --></SCRIPT>
<META content="MSHTML 6.00.2800.1106" name=GENERATOR></HEAD>
<BODY text=#000000 bgColor=#ffffff leftMargin=9 topMargin=0 marginheight="0">
<SCRIPT language=JavaScript1.2
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/menu_rollover.js"
type=text/javascript></SCRIPT>
<!--stopindex--><SPAN class=noindex><A name=top></A><!-- Begin Utility Logo -->
<TABLE cellSpacing=0 cellPadding=0 width=750 border=0>
<TBODY>
<TR>
<TD vAlign=top noWrap width=157><A href="http://www.ni.com/"><IMG
height=64 alt="NI Home"
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/logo.gif"
width=157 border=0></A></TD><!-- Begin Search --></FORM>
<TD vAlign=center noWrap align=right width=593>
<FORM name=search action=http://search.ni.com/nisearch/jsp/forward.jsp><A
href="http://sine.ni.com/apps/we/nios.store?lang=us&action=view_cart"><IMG
height=8 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/cart.gif"
width=12 border=0></A> <A class=global
href="http://sine.ni.com/apps/we/nios.store?lang=us&action=view_cart">view
cart</A> | <A class=global
href="http://www.ni.com/help/">help</A> | <SPAN
class=fineprint>search</SPAN> <SELECT class=fineprint
name=scope><OPTION value=dzTutorial>Tutorials<OPTION
value=dzExplprog>Example Code<OPTION value=DZone selected>NI Developer
Zone<OPTION value=site>Entire Site</OPTION></SELECT> <INPUT
class=fineprint maxLength=254 size=16 name=query> <INPUT type=image
alt=Search
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/search_go.gif"
align=top border=0> </FORM>
<SCRIPT language=JavaScript>document.write('<form method=post name="DominoForm1" action="' + document.forms[0].action + '">'); </SCRIPT>
</TD></TR></TBODY></TABLE><!-- End Utility Logo --><!-- Begin Global Navigation --><MAP
name=globalnav><AREA shape=RECT alt=Academic coords=557,0,627,20
href="http://www.ni.com/academic/"><AREA shape=RECT alt=Company
coords=684,0,751,20 href="http://www.ni.com/company/"><AREA shape=RECT
alt=Events coords=629,0,682,20 href="http://www.ni.com/events/"><AREA
shape=RECT alt="NI Developer Zone" coords=441,0,555,20
href="http://zone.ni.com/zone/jsp/zone.jsp"><AREA shape=RECT alt=Support
coords=378,0,439,20 href="http://www.ni.com/support/"><AREA shape=RECT
alt=Solutions coords=307,0,376,20 href="http://www.ni.com/solutions/"><AREA
shape=RECT alt="Products & Services" coords=180,0,305,20
href="http://www.ni.com/products/"><AREA shape=RECT alt="Contact NI"
coords=91,0,179,20
href="http://sine.ni.com/apps/we/nicc.call_me?p_lang_id=US"><AREA shape=RECT
alt=MyNI coords=0,0,90,20 href="http://my.ni.com/myni/myni"></MAP>
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
<TBODY>
<TR vAlign=bottom height=20>
<TD width=750 rowSpan=2><IMG height=20
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/devzone1_on.gif"
width=752 useMap=#globalnav border=0></TD>
<TD class=globalbar1 width="100%"><IMG height=20 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/invis.gif"
width=1 border=0></TD></TR></TBODY></TABLE><!-- End Global Navigation --></SPAN><!--startindex--><!--stopindex--><SPAN
class=noindex><!-- Body -->
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
<TBODY>
<TR vAlign=top>
<TD width=180><A class=clear
href="http://zone.ni.com/zone/jsp/zone.jsp"><IMG height=40
alt="NI Developer Zone"
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/zone_logo3.gif"
width=180 border=0></A><BR><IMG height=1 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/invis.gif"
width=1 border=0><BR><!-- Begin Navigation -->
<TABLE cellSpacing=0 cellPadding=0 width=180 border=0>
<TBODY>
<TR class=nav1bg height=1>
<TD width=12><IMG height=1 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/invis.gif"
width=12 border=0></TD>
<TD width=12><IMG height=1 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/invis.gif"
width=12 border=0></TD>
<TD width=12><IMG height=1 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/invis.gif"
width=12 border=0></TD>
<TD width=144><IMG height=1 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/invis.gif"
width=144 border=0></TD></TR>
<TR class=nav1bg style="CURSOR: hand"
onclick="window.location='http://zone.ni.com/devzone/devzone.nsf/webcategories/A85C862D8F00D3648625679000749080'; return true;">
<TD vAlign=top align=middle colSpan=2><IMG height=21 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/white_down.gif"
width=7 border=0></TD>
<TD colSpan=2><A class=nav1
href="http://zone.ni.com/devzone/devzone.nsf/webcategories/A85C862D8F00D3648625679000749080">Signal
Generators</A></TD></TR><!-- begin duo-bevel-->
<TR class=navmono1>
<TD colSpan=4 height=1><IMG height=1 alt=""
src="Direct Digital Synthesis (DDS) Mode (NI 5411-5431) - Tutorial - Development Library - National Instruments.files/invis.gif"
width=1 border=0></TD></TR><!-- end duo-bevel -->
?? 快捷鍵說(shuō)明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -