1, first set the multimeter to the diode measurement file;
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2, the black watch pen is connected to D (drain), the red watch pen is connected to S (source), at this time, there should be a pressure drop of 0.2~0.5 normally, and the multimeter displays figures between 0.2~0.5; viper12a power chip how to judge good or bad
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3, the black watch pen is connected to S (source), the red watch pen is connected to D (drain), this should have no pressure drop, the multimeter shows OL or 1;
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4, the black watch pen is connected with S (source), red G (grid) after loosening;
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5, the black watch pen does not move, and then use the red watch pen to connect D (drain), there should be a small voltage