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Old 16th May 2013, 01:44 PM   #1
Rixsta is offline Rixsta  United Kingdom
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Default Testing Mosfets on DMM HFE setting

Hi

Can I test Mosfets on the HFE transistor test on my DMM, as it says either
CBCE or EBCE, which is for normal transistors.
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Old 16th May 2013, 03:58 PM   #2
godfrey is offline godfrey  South Africa
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MOSFETs don't have an hFE, but you may be able to use it to see whether the MOSFET's working, or dead.
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Old 16th May 2013, 05:50 PM   #3
Rixsta is offline Rixsta  United Kingdom
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ahh, Thankyou yes I presume the voltages are low enough to not cause any problems with it so will give it a try
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Old 23rd May 2013, 02:34 AM   #4
JMFahey is offline JMFahey  Argentina
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Hfe won't give you any meaningful answer.

And diode scale will show only gross shorts *or* the reverse DS diode .
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Old 23rd May 2013, 02:30 PM   #5
macboy is offline macboy  Canada
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You can use the diode test to test the MOSFET. Short G to S. The MOSFET should now be off. Test from D to S using the diode test (red=D black=S). It should show no conductivity. Now touch the red to G (keep black on S), which will charge up the gate and turn on the MOSFET. Move red back to D and it should show a low reading. The small capacitance of the gate is enough to keep it charged even when it is not connected.

This is only a basic good/bad test to test for shorts and conductivity, it can't give you the transconductance (analogous to the HFE of a bipolar).
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