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Detecting performance of medium and small power transistors

Various methods for detecting the polarity, type, and performance of medium and small power transistors using a multimeter are basically applicable for detecting high-power transistors. However, due to the high operating current of high-power transistors, their PN junction area is also large. When the PN junction is large, its reverse Saturation current will inevitably increase. So, if you measure the resistance between the electrodes of medium and small power transistors, use the R value of a multimeter × When measuring at 1k gear, the resistance value must be very small, like a short circuit between poles, so R is usually used × 10 or R × 1st gear detection high-power transistor.