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I want to check an IGBT FGA25N120ANTD whether it is broken or not. I have a good multimeter.

I followed some online videos I cannot figure out the right way. Could you please help?

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There are 5 tests you can perform

1) impedance check

Collector-Emitter - should be Megs

Gate-Emitter - should be megs unless internal GE terminator resistor

2) Capacitive check

Gate-Emitter - should be capacitive ... (read further down)

3) Diode check

DMM on diode and Emitter - collector - should be a diode

4) withstand

Megger on 500V (or suitable level for the breakdown voltage BUT less than) Collector-Emitter

5) switch test

20V PSU Collector-Emitter with say... 1A limit, 15V PSU Gate-Emitter - 1st PSU should go into current limit

Do these tests on a known working switch so you know what to expect.

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  • \$\begingroup\$ Not sure this is totally clear. What's a Meg? Megger? PSU? Does that terminator resistor really need to come from General Electric? Possible to decode this into plain english, so an average Joe could say... test an IGBT? Question. I see lots of videos online talking about testing an IGBT with 12v battery and lamp. Which of your tests serves as that function? (The fact that I can't tell suggests your descriptions could possibly be improved...or is that a sixth suggested test?) . Thank you for the assistance. \$\endgroup\$ – zipzit May 12 '17 at 8:12
  • \$\begingroup\$ the answer is fine. Those that know what an IGBT is, know what a PSU is, know what a Megger is, know where the GE is. Please familiarize yourself with an IGBT. Your "average Joe" should not be going near one as these involve 600-1200V \$\endgroup\$ – JonRB May 12 '17 at 9:14
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Try a diode check across the collector and emitter. If the IGBT is dead, it should read 0 volts.

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    \$\begingroup\$ Maybe you could add a little more detail on the test and how it should be performed in some more detail? \$\endgroup\$ – PeterJ Jan 23 '15 at 12:32

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