mosfet
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Jan 17, 2013, 5:46 PM
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Testing a Mosfet
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Metal Oxide Semiconductor Field Effect Transistor
This testing procedure is for use with a digital multimeter in the
diode test-range with a minimum of 3.3 volt over d.u.t. (diode-under-test).
If your multi-meter is less than that it will not do the test. Check your
meter manual for the specs.
Connect the 'Source' of the MosFet to the meter's negative (-) lead.
1) Hold the MosFet by the case or the tab but don't touch the metal parts
of the test probes with any of the other MosFet's terminals until needed.
Do NOT allow a MOSFET to come in contact with your clothes, plastic or plastic
products, etc. because of the high static voltages it can generate.
2) First, touch the meter positive lead onto the MosFet's 'Gate'.
3) Now move the positve probe to the 'Drain'. You should get a 'low' reading.
The MosFet's internal capacitance on the gate has now been charged up by the
meter and the device is 'turned-on'.
4) With the meter positive still connected to the drain, touch a finger between
source and gate (and drain if you like, it does not matter at this stage).
The gate will be discharged through your finger and the meter reading should
go high, indicating a non-conductive device.
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