Test with a multimeter

N-channel MOSFET (2N7000 / IRLZ44N)

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Now: Body diode: red on S, black on D

The pinout of a different model isn’t used in this test.

CircuVanta 6000 counts · auto range DCAUTO•)))HOLDFUSE− HOLD LIGHT OFFV⎓V~Ω•)))FmA⎓ mA400 mACOMVΩ 2N7000 · Source (S) 1 S 2N7000 · Gate (G) 2 G 2N7000 · Drain (D) 3 D
Pin 1: 2N7000 · Source (S) (S) Pin 2: 2N7000 · Gate (G) (G) Pin 3: 2N7000 · Drain (D) (D)

Red probe Not connectedBlack probe Not connected

Hold the probe and drag it to the tip of a leg. Tapping works too: first pick the probe, then the leg.

Set the range to diode test.

Measure step by step

A MOSFET has a body diode between source and drain; you see it in the diode range. The gate, however, is insulated inside and should not conduct to any pin. This guide uses the pin order of the 2N7000 in the Atlas.

Static electricity can damage a MOSFET’s gate. Before measuring, touch the pins together for a moment to discharge the gate.

  1. 1Body diode: red on S, black on D
  2. 2Reverse: red on D, black on S
  3. 3Gate to source
  4. 4Gate to drain