Power Electronics Testing Archive

How to Repair Digital Oscilloscope?

DSO – Means Digital Storage Oscilloscope. Features: 1. Dual Analog channels. 2. 5.6 inch 64k TFT LCD Screen. 3. Waveform record and replay. Application of DS. 1. Electronic circuit testing. 2. Functional testing with circuit. 3. Logical signal verification. 4. To test mixed signals. Type: DS1052E. Frequency:

How To Test IGBT?

The INSULATED GATE BIPOLAR TRANSISTOR (IGBT) is a three-terminal power semiconductor device  used as an electronic switch and in newer devices is high efficiency and fast switching It switches electric power in many modern appliances:electric cars, trains,variable speed refrigerators, air-conditioners and even stereo systems with switching amplifiers. Since it is designed to turn on and off

How to test MOSFET?

MOSFET (Metal Oxide Semiconductor Field Effect Transistor)  There are two types namely; 1.Enhancement MOSFET, 2.Depletion – MOSFET. The (MOSFET) is a transistor used for amplifying or switching electronic signals. Although the MOSFET is a four-terminal device with source (S), gate (G), drain (D), and body (B) terminals, the body (or substrate) of the MOSFET often is connected

How to check a SCR with digital multimeter?

SCR – Silicon Controlled Rectifier, Thyristor (THYRatron and transISTOR) The name THYRISTOR  is derived by a combination of the capital letters from THYRatron and transISTOR.  The thyristor is a solid state device like a transistor and has characteristics similar to that of a thyratron tube version.Types of thyristor family like, A. TRIAC-Bidirectional triode

How to test a TRIAC with diode mode?

A thyristor is a four-layer semiconductor device, consisting of alternating P type and N type materials (PNPN). The four layers act as bistable switches. As long as the voltage across the device has not reversed (that is, they are forward biased), thyristors continue to conduct electric current. The most common

How To Test DIAC

A Diac is a two-electrode bidirectional avalanche diode which can be switched from off-state to the on-state for either polarity of the applied voltage. Again the terminal designations are arbitrary since the Diac, like Triac, is also a bilateral device. The switching from off-state to on-state is achieved by simply exceeding


An opto-isolator contains a source (emitter) of light, almost always a near infrared light-emitting diode (LED), that converts electrical input signal into light, a closed optical channel (also called dielectrical channel, and a photo sensor, which detects incoming light and either generates electric energy directly, or modulates electric current flowing from an external power supply. The sensor can be a photoresistor,


The zener diode characteristics shows under the reverse bias condition, the voltage across the diode remains almost constant although the current through the diode increases in the region p-n. So the voltage across the Zener Diode: 6.2v To 200V Regulator PDF Details: zener diode serves as a reference voltage.