Checking a transistor

Discussion in 'General Electronics Chat' started by GRNDPNDR, Mar 29, 2014.

  1. GRNDPNDR

    Thread Starter Member

    Mar 1, 2012
    435
    7
    I've got a couple of NPN power transistors I'd like to know 100% if they are working.

    I've checked them by putting my DMM into diode mode, and checking from B-C, B-E with positive on the base.

    I get a reading one direction and not in another, so according to videos on checking a transistor it should be a good transistor.

    Is this 100% though? Does it mean my transistors are actually good?
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,813
    1,105
    It's a start, but not 100%. You could also check the DC gain. As for bandwidth, leakage etc you would need more than a DMM to test those.
     
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