TESTING AN unknown TRANSISTOR

Hello Everyone ... Today i am going to start another part of my blog which name is Component Testing.And the 1st component which i selected for testing is transistor.I hope you will like it. So no more wait , Let's start...

In the testing of a transistor the first thing you may to know the COLLECTOR, BASE AND EMITTER of a transistor. You also need to know if it is NPN or PNP. Now forget all those circuits for testing a transistor which is more easy then other.For this you need a multimeter (DIGITAL METER OR ANALOGUE METER). I am going to test this with Digital multimeter.

Step 1 - Required Things

                                                                     Digital Multimeter                                                           

              

Transistors

Step 3 - The Transistors

Now, comes the part of testing the transistors.

Let me tell you about the NPN transistor, it has the collector and emitter as negative and the base as positive, which is just opposite in PNP transistors.

First, set the multimeter on the transistor testing mode.

Now, take the leads of the multimeter and connect it to the leads of the transistors as shown in the picture. The negative lead to the negative terminal and positive lead to the positive terminal.
There will be a reading in the multimeter.

Now, connect the negative lead to the other negative terminal.Again the multimeter shows a reading.


The reading in both the cases is almost equal.

                 

                                                                                                      

Step 4: DETECTING A BAD TRANSISTOR

Now, connect the leads to both the negative terminals. If the multimeter shows 1 as a reading then the transistor is just fine.
And if this is not the case then the multimeter produces a buzzing sound and shows 000 as a reading ,and the transistor is just too bad.