There is a new method for measuring transistor 1

The transistor is one of the most common devices in electronic circuits. It is widely used in various electronic circuits. However, determining the quality and polarity of a transistor  is a difficult point for beginners.

Give yourself more confidence after reading the following content. You can confidently say: I can also extract the B, C, and E of the transistor.

Firstly, we need to understand a common sense issue: when a digital multimeter is in diode mode, the red probe represents the positive electrode.

Start working, select the diode mode of the digital multimeter, use the red probe to connect one of the transistor pins<assuming as the base>, and use the black probe to connect the other two pins separately. If the LCD screen of the multimeter displays a voltage of a few tenths of volts<0.3 for the germanium transistor  twice. The silicon tube is around 0.7. So this transistor should be an NPN transistor and the pin connected to the red probe should be the base. If it appears as' OL 'twice, then the pin connected to the red probe is the base of the PNP transistor .