I am measuring a power mosfet with a multimeter. The voltage at the source with respect to GND is ~291V. The voltage at the drain with respect to GND is ~16V. The P-type mosfet is rated for 250V, so I'd expect it to be completely avalanching from S to D, but that is not occuring. When I measure the voltage with black probe on drain, and red probe on source, I get only ~2V. The mosfet is either broken, or I'm reading the mosfet wrong with the probes. Sound familiar to anyone?