irf540 and irf9540 can these be tested with a dmm - diyAudio
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Old 12th November 2006, 11:19 PM   #1
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Default irf540 and irf9540 can these be tested with a dmm

Hi everyone can these hexfets be tested with a dmm to see if they are bust or no .cheers
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Old 13th November 2006, 01:50 AM   #2
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Default IRF5XX TO BE TESTS

Homer:

First of all, I want to Know what parameter of the FET you wanted to test by a dmm, usually a dmm can only define out N channel or P channel, Gate junction failure, other than this, I don't think a dmm can do any further unless your dmm is a special made.

Give me more info. so that we can help!




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Old 13th November 2006, 03:52 AM   #3
clem_o is offline clem_o  Philippines
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I think homertooties refers to 'gross functionality'...

Cheers!
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Old 13th November 2006, 08:58 AM   #4
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Default hexfets

Hi there thanks for replys i just wish to test them as in function,so i can determine whether i have to replace them or not as amp is getting a pain in the ****.............
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Old 13th November 2006, 10:27 AM   #5
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Test drain-source and source-drain with an ohm meter. whilst gate and source are shorted. If short both ways then it's broken. The body drain diode will show some continuity source-drain depending on your meter, and setting to diode test will fully test this, but this is not necessary.
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Old 13th November 2006, 11:14 AM   #6
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Default hexfets

Hi there many thanks for reply i shall do that test
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Old 13th November 2006, 11:28 AM   #7
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Default hexfet test results look good

Hi all i have tested these hexfets and the readings are all done with diode test on my Di -log DL 293 Meter.

irf9540 (1) Gto S Shorted - lead on g and s + lead on D
reading 752 ohms reversed no reading

irf540 (2) G to S Shorted + lead on g and s - lead on D
reading 516 ohms reversed no reading

The above two fets were getting very hot when in amp.

irf540 (3) G to S Shorted + lead on g and s - lead on D
reading 518 ohms reversed no reading

irf9540 (4) G to S Shorted - lead on G and s - lead on D
reading 827 ohms reversed no reading

i am guessing these fets are fine and the trouble is in the pre and driver stages............
Anyone agree please let me know what a great forum this is...
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Old 13th November 2006, 11:33 AM   #8
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Yes a bad device would show very low resistance at least one way if not both.
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Old 13th November 2006, 11:36 AM   #9
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Default further testing

Many thanks Richie00boy i shall play further with the tough dog,i will update later
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