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级别:
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积分:1434分 |
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注册:2007年11月05日
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答：
<P style="MARGIN: 0px; TEXT-INDENT: 25px; LINE-HEIGHT: 150%"><FONT size=2><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三极管基极确定后，通过交换表笔两次测量</SPAN><SPAN lang=EN-US>e</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US>c</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">极间的电阻，如果两次测量的结果应不相等，则其中测得电阻值较小的一次为红表笔接的是</SPAN><SPAN lang=EN-US>e</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">极，黑表笔接的是</SPAN><SPAN lang=EN-US>c</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">极。</SPAN></FONT></P>
<P style="MARGIN: 0px; TEXT-INDENT: 25px; LINE-HEIGHT: 150%"><FONT size=2><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对于</SPAN><SPAN lang=EN-US>PNP</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">型三极管，方法与</SPAN><SPAN lang=EN-US>NPN</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">管类似，只是红、黑表笔的作用相反。</SPAN></FONT></P>
<P style="MARGIN: 0px; TEXT-INDENT: 25px; LINE-HEIGHT: 150%"><FONT size=2><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在测量</SPAN><SPAN lang=EN-US>e</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US>c</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">极间电阻时要注意，由于三极管的</SPAN><I><SPAN lang=EN-US>V</SPAN></I><SUB><SPAN lang=EN-US>(BR)CEO</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">很小，很容易将发射结击穿。</SPAN></FONT></P>
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