判别红外接收头引脚方法_奔驰的空间--张洪亮博客.htm

上传一份关于红外通信 常用的红外发射和接收头的引脚判断

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<DIV class=tit>判别红外接收头引脚方法</DIV>
<DIV class=date>2008-04-10 00:53</DIV>
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            style="FONT-SIZE: 14pt; mso-font-kerning: 0pt">&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
            style="mso-font-kerning: 0pt; mso-fareast-: 10.5pt"> 
            </SPAN></FONT></FONT></STRONG><SPAN 
            style="mso-font-kerning: 0pt; mso-bidi-: 10.5pt"><STRONG><FONT 
            color=#cc99ff 
            size=5>红外接收头一般有三只引线脚，分别为接地、电源和信号输出。不同型号的红外接收头，其引脚排列也不相同。笔者用电阻法判别红外接收头的引脚简单、快速。</FONT></STRONG><SPAN><BR></SPAN></SPAN><STRONG><FONT 
            size=5><FONT color=#cc99ff><SPAN 
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            style="mso-font-kerning: 0pt; mso-bidi-: 10.5pt">用指针式万用表（数字表不适用）电阻挡Ｒ×１ｋ（或Ｒ×１００），先测量确定接地脚，一般接地脚与屏蔽<A 
            class=qs_highlight1 style="FONT-SIZE: 1em" 
            href="http://clk.qunsee.com/click/click.php?cpid=12&amp;ads_id=67&amp;pid=99002440&amp;cid=2447&amp;url=http%3A//www.zhonghua2008.com.cn/index.asp%3FurlFrom%3Dsina&amp;k=%u5916%u58F3&amp;s=http%3A//www.picavr.com/n1523c35.aspx&amp;rn=20577&amp;v=1&amp;ref=http%3A//www.baidu.com/s%3Fwd%3D%25BA%25EC%25CD%25E2%25BD%25D3%25CA%25D5%25CD%25B7%25D2%25FD%25BD%25C5%26lm%3D0%26si%3D%26rn%3D10%26ie%3Dgb2312%26ct%3D0%26cl%3D3%26f%3D1%26rsp%3D6&amp;province=%u6CB3%u5317&amp;city=%u77F3%u5BB6%u5E84" 
            target=_blank>外 
            壳</A>是相通的，余下的两只脚假设为ａ和ｂ，然后用黑表笔搭接地脚，用红表笔去测ａ或ｂ脚的阻值，读数分别约为６ｋΩ和８ｋΩ（有的接收头相差在１ｋΩ左右）；调换表笔，红表笔接地，黑表笔测ａ和ｂ脚，读数分别约为２０ｋΩ和４０ｋΩ。两次测量阻值相对应都小的ａ脚即为电源脚，阻值大的ｂ脚即为信号输出脚。不过用不同的万用表和测不同型号的接收头，所测得的电阻都各不相同。但总的结论是：电源脚对地的电阻值不管正反向都要比信号脚对地的电阻值小</SPAN></FONT></FONT></STRONG></P></DIV></DIV></TD></TR></TBODY></TABLE><BR></DIV></TD></TR></TBODY></TABLE><BR>
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