9/13/2023 0 Comments Using a transistorTo check each pair of leads of a transistor for conduction, you can use a multimeter or a simple tester like a battery, LED, and resistor.įor transistor testing set a digital multimeter to diode test and an analog multimeter to low resistance range. Note: If you want to test the PNP transistor then use the same circuit but reverse the LED and the supply voltage. When the switch is pressed, the LED turns on indicates that the transistor is ok while when the switch is released the LED turns off indicates that the transistor is not ok. Always include a 10K ohm resistor in base connection to protect your transistor from excessive current. Apply voltage is not critical so selects the suitable voltage in between 5V and 12V. (i) Testing in a simple switching circuit:Īs shown in Figure below, connect the NPN transistor in the circuit which uses it as a switch. Follow these two methods for testing a transistor: If you have a doubt that a transistor may be damaged, then you can test your transistor easily with the help of multimeter and in a switching circuit. Transistors can be damaged by extensive heat when soldering or by misuse in a circuit. Video by: Electrical4u Sponsored Links How to Test a Transistor Similarly, when we apply a positive signal to the base of the transistor, it turns “ on” acting like a closed switch which allows maximum current flows through the device. When we apply zero signal to the base of the transistor, it turns “off ” and acts like an open switch which results in zero collector current flows. In many circuits, you can use a transistor as a “single pole single throw” solid-state switch. In this region, no collector current flows i.e.Transistor operates as an “open switch”.
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