Think about the different tests you may carry out to determine if a transistor is good....

Think about the different tests you may carry out to determine if a transistor is good. Discuss them.

Expert Solution

Different Tests to check transistor

1) Test for short circuit between collector and emitter.

1. Test the resistance between collector and emitter.

2.Then reverse the positive and negative meter connections and test again.

If the meter reads zero or a few ohms in tests 1 and 2, there is a short circuit between collector and emitter and the transistor is faulty. If both readings are infinity, means transistor is good.

2) Test forward resistance of base−emitter and base−collector junctions

1. Connect the positive meter lead to the base, and test the resistance of both junctions by connecting the negative meter probe to one of the other two pins. It doesn't really matter whether this is the collector or the emitter, this test is the same for any junction.

2. Now leave the positive lead on the base, and move the negative lead to the other untested (collector or emitter) pin, and measure the resistance of this junction.

If we get a typical forward resistance reading of around 500 to 1K ohms in both cases. A reading of zero ohms indicates a short circuit and a faulty transistor.

3) Test reverse resistance of base−emitter and base−collector junctions-

1. Connect the negative lead of your meter to the base and the positive lead to another pin as shown at 5 in Fi

2. Finally, connect the positive probe to the other untested pin.

If both junctions should read infinity. it's a good transistor.

If all of these six tests are ok you have a good transistor. If one or more of the tests has failed, so has the transistor!

Manojponduru answered 2 years ago

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