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西门子544-350
544-350
当找到两个小电阻后,所固定的一支表笔所用的为基极。若固定的表笔为黑笔,则三极管为NPN型,若固定的为红笔,则该管为PNP。
A、判断ce极电阻法
用万用表测量除基极为的两极的电阻,交换表笔测两次,如果是锗管,所测电阻较小的一次为准,若为PNP型,测黑表笔所接的为发射极,红表笔接的是集电极,若为NPN型,测黑表笔所接的为集电极,红表笔接的是发射极;如果是硅管,所测电阻较大的一次为准,若为PNP型,测黑表笔所接的为发射极,红表笔接的是集电极,若举NPN喋,测黑表笔所揥的为集烷极,红表笔接的是发射极。
544-350
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