![]() The working of this transistor tester circuit is such that it operates at 2Hz of frequency. Also, this circuit can work through a battery for a long duration. NE 555 Timer IC is a multivibrator that works in three modes: astable, monostable and bistable. By using this circuit, different faults can be checked –like to know whether the condition of a transistor is good or not, and opened or shorted, and so on. To develop this circuit, basic electronic components like resistors, diodes, LEDs and NE5555 are used. It can be easily build up on a general purpose PCB. This circuit is simple as compared to other transistor testers, and therefore, is useful for technicians as well as students. This transistor tester circuit that uses 555 timer IC is fit for testing both PNP and NPN transistors. If the measured voltage is around 1.8V, then the transistor will be dead. The voltage of a healthy transistor should be 0.7V, and the measurement across the emitter collector should read 0.0V. Similarly, connect the black lead (negative) to the base terminal of the NPN transistor, and red lead (positive) to the emitter or collector terminal of the transistor. Connect the red (positive) lead to the base terminal of the PNP transistor, and the black (negative) lead to the emitter or base terminal of the transistor. ![]() The digital multimeter consists of two leads: black and red. PNP and NPN transistor can be checked using the digital multimeter. By using this test, you can also identify the polarity of an unknown device. Procedure of a Transistor Tester Using a Digital Multimeter Transistor Tester Using a Digital MultimeterĪ digital multimeter is used to test the base to emitter and base to collector PN junction of the BJT. It is used to test the base to emitter and base to collector PN junction of a BJT. The DMM or digital multimeter is one of the most common and useful items of test equipment. The readings measured by this tester are accurate, and among the important characteristics measured are input resistance Rin, common base and common emitter. This type of transistor tester usually performs three types of tests: Forward current gain, base to collector leakage current with open emitter, and short circuits from collector to base and emitter.Ī Laboratory Standard Tester is used to measure a transistor’s parameters at various operating conditions. The advantage of using this tester is such that among all the components in the circuit only transistor is not removed. This type of transistor tester specifies to a technician whether a transistor is still operative or dead. Quick check in circuit checker transistor tester is used to check whether a transistor is performing properly in a circuit or not.
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