![]() ![]() Hook the negative meter lead to the EMITTER (E) of the transistor. Hook the positive lead from the multimeter to the to the BASE (B) of the transistor. Remove the transistor from the circuit for accurate test results. (Some meters have the diode test function coupled with the continuity test – this is OK). If your meter does not have a transistor testing function, fear not – transistors can easily be checked with the “Diode” testing setting. You will probably get information such as the gain(hFE) that could be checked against the datasheet as well as a pass/fail reading. Some multimeters have a built-in transistor testing function, if yours does, you can skip this blog post – simply insert your transistor into the socket on the multimeter and set the meter to the correct mode. Specialized component analyzers exist to do this task, but the expense can be difficult to justify for the average hobbiest.įortunately, using a DMM to get a basic pass/fail reading from a suspected faulty NPN or PNP bipoloar transistor is a simple and quick task. One particularly usefull skill is knowing how to test a transistor using a digital multimeter. ![]() In a pinch, a DMM can even substitute for expensive, specialized test equipment. These versitiale devices can be used to test and diagnose a wide range of circuits and components. Ask any field or bench technician what their most-used piece of test equipment is and they will probably say a DMM (Digital MultiMeter).
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