?? 判別紅外接收頭引腳方法_奔馳的空間--張洪亮博客.htm
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<DIV class=tit>判別紅外接收頭引腳方法</DIV>
<DIV class=date>2008-04-10 00:53</DIV>
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size=5>紅外接收頭一般有三只引線腳，分別為接地、電源和信號輸出。不同型號的紅外接收頭，其引腳排列也不相同。筆者用電阻法判別紅外接收頭的引腳簡單、快速。</FONT></STRONG><SPAN><BR></SPAN></SPAN><STRONG><FONT
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style="mso-font-kerning: 0pt; mso-bidi-: 10.5pt">用指針式萬用表（數字表不適用）電阻擋Ｒ×１ｋ（或Ｒ×１００），先測量確定接地腳，一般接地腳與屏蔽<A
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href="http://clk.qunsee.com/click/click.php?cpid=12&ads_id=67&pid=99002440&cid=2447&url=http%3A//www.zhonghua2008.com.cn/index.asp%3FurlFrom%3Dsina&k=%u5916%u58F3&s=http%3A//www.picavr.com/n1523c35.aspx&rn=20577&v=1&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&province=%u6CB3%u5317&city=%u77F3%u5BB6%u5E84"
target=_blank>外
殼</A>是相通的，余下的兩只腳假設為ａ和ｂ，然后用黑表筆搭接地腳，用紅表筆去測ａ或ｂ腳的阻值，讀數分別約為６ｋΩ和８ｋΩ（有的接收頭相差在１ｋΩ左右）；調換表筆，紅表筆接地，黑表筆測ａ和ｂ腳，讀數分別約為２０ｋΩ和４０ｋΩ。兩次測量阻值相對應都小的ａ腳即為電源腳，阻值大的ｂ腳即為信號輸出腳。不過用不同的萬用表和測不同型號的接收頭，所測得的電阻都各不相同。但總的結論是：電源腳對地的電阻值不管正反向都要比信號腳對地的電阻值小</SPAN></FONT></FONT></STRONG></P></DIV></DIV></TD></TR></TBODY></TABLE><BR></DIV></TD></TR></TBODY></TABLE><BR>
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