You may also be able to use the voltage drop to determine which lead is the emitter on an unmarked transistor, as the emitter-base junction typically has a slightly higher voltage drop than the collector-base junction. If you are testing PNP transistor, the meter should show a voltage drop between 0. For an good NPN transistor, the meter should show a voltage drop between 0. Some meters have the diode test function coupled with the continuity test - this is OK. 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. 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. Written by Eli on Thursday, May 04, Ask any field or bench technician what their most-used piece of test equipment is and they will probably say a DMM Digital MultiMeter. Back to the blog Test a transistor with a multimeter.
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