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MIL-STD-750-3 Transistor Testing

  1. Aug 19, 2016 #1
    I just want to check my sanity...

    I am going to be testing some transistors in a lab very soon per the above mil std. The test methods range from Vce, Vbe, hfe and the breakdown voltages that are listed on the datasheet. The transistor at this point is irrelevant.

    Here's what I need to understand. According to the mil std, the circuits are all drawn for PNP trnsistors in one configuration. That's fine. However, I will most,likely be testing NPN transistors. So, if I understand this right, all I need to do is reverse the polarity of the sources and test equipment (ammeter, voltmeter) in order to correctly perform the tests per this std. Is this right?
     
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  3. Aug 19, 2016 #2

    berkeman

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    Staff: Mentor

    Is there a different standard for testing NPN transistors? It seems strange that the standard would leave it up to the tester's imagination to come up with the complementary test circuit setups. It's not that hard, but it could be error-prone.
     
  4. Aug 19, 2016 #3
    No, there is not a different methods for NPN. That's why I'm asking. I suspect it is merely a matter of reversing things - keep the emitter, collector and base where they are in the circuits, but simply reverse the polarity on the sources. However, as I said, I'm not positive on this and I really don't like burning the UUTs.
     
  5. Aug 19, 2016 #4

    berkeman

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    Staff: Mentor

    I just found out that the standard is available for free download (I'd assumed it was copyrighted and needed to be purchased). Here is one source:

    https://snebulos.mit.edu/projects/reference/MIL-STD/MIL-STD-750-3.pdf

    And they mention that the PNP circuits are the only ones shown, and others will be used for NPN transistors:
    And in the Notes for Figure 3011-1, they do say to reverse the sources for NPN transistors:
    I think in general reversing the polarity of the sources should work for most testing of PNP/NPN transistors, but if you have a question about a particular circuit that you want to verify, go ahead and post the two versions here in this thread so we can double-check them. :smile:
     
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