collegefurtrader, (edited )

Connect the gate to a function generator via a series resistor. (Gnd on the source pin) Drive it with a square wave 0v low 5+v high and observe the gate voltage on the oscilloscope. You will see a little plateau spot in the waveform, this is at the gate threshold voltage.

https://discuss.tchncs.de/pictrs/image/abe4e59b-23d0-4bd5-a36f-8717a0d69fca.jpeg

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