Transistor Testing

Transistor Testing 

Transistor Testing in Continuity Mode:

A transistor has three terminals: base, emitter, and collector. To test them using the continuity mode of your multimeter, follow these steps:

(1) Set the multimeter to continuity mode.
(2) Place either the black or red probe on the base of the transistor.
(3) Touch the other probe sequentially on the emitter and collector.
(4) If both readings are the same, the transistor is good.
(5) If there is no reading in the initial configuration, switch the base       probe and repeat steps 2 and 3. One of these combinations should       now show a reading, indicating a good transistor.

Identifying Transistor Type:


To determine whether the transistor is NPN or PNP, pay attention to which configuration results in a reading and which probe is on the base in that configuration:

  • If the red probe is on the base when a reading appears, the transistor is PNP.
  • If the black probe is on the base when a reading appears, the transistor is NPN.

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