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Old 20th Jun 2009, 3:57 pm   #4
Station X
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Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
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Default Re: Testing Transistors.

If you see results as shown above the transistor is generally good. On very few occasions I have seen transistors which are OK on a diode test, but have no gain.

Faulty transistors will generally have open circuit or short circuit junctions. The former will read high resistance both ways and the latter will show a very low or zero volt drop both ways.
Graham. Forum Moderator

Keep the soldering iron hot.
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