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How to identify the polarity of the npn transistor when the meter is on resistace scale?
Wiki User
∙ 11y ago
For the identification of the transistor leads when you were only given with a resistance measuring device follow this procedure.
as we know that irrespective of the first and the third leads the middle one always represents base. now measure resistance between 1-2 and 2-3 (say a and b)
we know that for any transistor the emitter -base junction is forward biased and the base-collector junction is reverse biased. So, we can conclude that emitter-base junction has a very low forward resistance when compared to the large values of collector base junction.
so if ,
a>b --- 1-collector, 2-base, 3-emitter
a
Wiki User
∙ 11y ago
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It is possible with an ohmmeter usually the can has a tab signify emitter. some plastics devices have the emitter on the right lead looking at the flat part. using an ohmmeter you may check for the two diodes inside.
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How do you identify base collector and emitter of transistor?
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How do you test polarity on a boiler?
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