✔ Npn Transistor Test Using Multimeter

Npn Transistor Test Using Multimeter

- April 04, 2018

If you are testing pnp transistor you should see ol over limit. For an good npn transistor the meter should show a voltage drop between 045v and 09v.

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Testing Transistors In The Circuit

You can test a transistor with a multimeter that has a diode test function.

Npn transistor test using multimeter. How to check npn and pnp transistors using digital multimeter easy process. Easy process to check a common. The diode test using an analogue multimeter can be extended to give a simple and straightforward confidence check for bipolar transistors.

The base collector junction is one diode and the base emitter junction is the other. There will be a reading in the multimeter. A transistor is a semiconductor that allows current to flow through it under certain conditions and cuts current off when other conditions are present.

Steps to identify the npn type transistor. First set the multimeter on the transistor testing mode. Keep the positive probe to the center pin base of the transistor.

Now take the leads of the multimeter and connect it to the leads of the transistors as shown in the picture. Hook the negative meter lead to the emitter e of the transistor. Keep the multimeter in the diode mode.

An npn transistor that functions properly should show a voltage drop between 045 and 09 volts and a pnp transistor should show an over limit message. Any signs on the multimeter that differ from these values could indicate bad transistor symptoms. For this test you can view the transistor as two diodes connected as shown in below figure for both npn and pnp transistors.

How to check bipolar junction transistor bjt using a digital or analogue multimeter. I used a digital autoranging meter because it showed up the best on camera but in reality you can use any meter. This video teaches about how to test npn and pnp transistors with a multimiter.

Transistors are commonly used as either a switch or a current amplifier. Again the test using a multimeter only provides a confidence check that the bipolar transistor has not blown but it is still very useful. If the multimeter positive probe is connected to the cathode of the diode and the negative probe to the anode then it will not give any voltage showing zero.

Hook the positive lead from the multimeter to the to the base b of the transistor. The negative lead to the negative terminal and positive lead to the positive terminal. A digital multimeter can be used as a fast and simple way to check a transistor for open or shorted junctions.

At this point check the reading on your multimeter.