Given I listed the RG Keen method, I thought I should add the Small Bear method as well. It's a simpler test that some people prefer, and it's generally considered not as accurate as the RG Keen method but close enough for most purposes.
NOTE:
- Be prepared to see the voltage fluctuate a lot while the transistor stabilises. Don’t wait too long though, as you will be there forever - it may never stop!
- Handle the transistor as little as possible with your fingers, as the heat will transfer
- Different environments will provide different results - this is very temperature dependant
- With all methods, the test results will vary, depending on the method used. Why? Without attempting to explain the math that I don't fully understand, hFE varies with the current applied to the base. Different test methods and test equipment apply different currents, so results will differ.
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