How to test an scr with a multimeter

This publication deals with the testing of thyristors - silicon-controlled rectifiers - using an ohmmeter.

How to test an scr with a multimeter

A pin assignment diagram for thyristors in a TO-220 package is provided for reference.

Testing SCRs with a multimeter

Identify the ohmmeter terminals.

Using a junction diode we can tell which ohmmeter lead is positive and which is negative.

Connect a generic PN diode to the positive and negative terminals of the ohmmeter.

The ohmmeter will only show continuity if the positive lead is connected to the anode of the diode and the negative lead is connected to the cathode.

Based on this concept, SCRs can be tested with an ohmmeter.

Procedure for testing SCRs with an ohmmeter.

To test the SCR, connect the positive lead of the ohmmeter to the anode and the negative lead to the cathode.

The ohmmeter should not show continuity.

Touch the thyristor gate to the anode.

The ohmmeter should show continuity at the SCR.

When the wire is removed from the anode gate, the wire may break or continue, depending on whether the ohmmeter is providing enough current to keep the device above the holding current level.

If the ohmmeter indicates that there is continuity at the SCR before the gate touches the anode, the SCR is shorted.

If the ohmmeter does not show continuity at the SCR after the gate touches the anode, the SCR is open circuit.

Comentarios

Entradas más populares de este blog

How do 3 wire proximity sensors work

The different proximity sensors that we find in the market can be classified by the technology they use to feed and obtain the output of the sensor. The different types of proximity sensors can be connected with two wires, three wires or four wires. Proximity sensor terminals The cables used for the sensors follow European and international standards that make it easy to distinguish which function each cable has. The cables or terminals that we are going to find in a proximity sensor, the mission that each cable fulfills and the nomenclature of the cable that comes from an abbreviation of the color of the cable in English is detailed below: Positive supply (+): The cable is brown and is called BN for brown Negative (-) supply: The cable is blue and is called BU for blue Sensor output : The cable is black and is called BK for black Antivalent or normally closed output : The cable is white and is called WH for white. Two-wire proximity sensors This type of proximity sensors that hav...

What is a 4000 count multimeter

What is a 4000 count multimeter It is a moderately rugged meter that is well suited for most applications. In my limited testing, the accuracy seems to be as advertised.AstroAI is a reputable brand and comes with a three year warranty. It is ready to use, as there are 3 AAA batteries installed and the cable (probe) is included. The red part of the case is covered with rubber. The meter measures just over 3 inches wide, just over 6 inches long and just over 1-3/8 inches thick. It weighs just over 5-1/2 ounces. Here's some information to give you a few facts RMS, for short: a useful and accurate method for measuring all forms of alternating current (AC). Some low-cost meters use simpler methods that are not as accurate in some cases. Long story short: when measuring AC, it is useful to convert it to its DC equivalent. If you have ever looked at an oscilloscope displaying AC current, you have probably seen the famous sine wave pattern that is typical of AC current, but this wave patte...

What does 50 milliamps look like on a multimeter

What does 50 milliamps look like on a multimeter? Explanation A multimeter shows 50 milliamps as 0.05 amps on the display. Stay tuned, because in this article we will take a closer look at what 50 mA looks like on a multimeter. What is a multimeter and what is it used for? A multimeter is a device that measures various electrical characteristics, such as voltage, current and resistance. It can be used to test batteries, cables and other electrical components. Multimeters typically have a wide range of voltage and current measurements, as well as various resistance measurements. They can also be used to test capacitors and diodes. A multimeter is an essential tool for electronic engineers. It can help you figure out what goes wrong when a device is not working, or use it as part of your workbench with various electronic components. Simply put, a multimeter measures voltage, current and resistance. It can be used to test batteries, fuses, wires and other electrical components. Today, dig...

How to test fuel rail pressure sensor with multimeter

Buscar este blog