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 to measure diesel engine rpm with a multimeter

How to measure diesel engine rpm with a multimeter What is RPM?:In this article we are going to show how to measure RPM with an automotive multimeter, however it is necessary to be clear about certain concepts. RPM stands for Revolutions Per Minute and is a great way to see how hard your engine is working. When we talk about cars, we can interpret that the more RPM an engine has, the faster it will do its job, thus being able to achieve higher speeds. This result will be obtained accompanied by other factors such as the number of cylinders, and the good condition of the suspension, the transmission system and the torque. The most common way to measure the revolutions of an engine is using a tachometer, but this is an instrument that we do not usually have at home. However, if you have a multimeter it will be more than enough to measure the RPM of an engine. What are the best multimeters to measure engine rpm? Based on our experience, we recommend the Fluke brand as it ...

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 are the symptoms of a faulty glow plug relay

What are the symptoms of a faulty glow plug relay Most people don't know what glow plugs are or how they work, but if you drive a Mercedes with a diesel engine, they are an important part of the engine. When it's cold outside and you turn the key to start the car, the engine can be difficult to start. Especially in diesel engines, the block and cylinder head have difficulty absorbing most of the heat of compression needed for ignition. The spark plug, which looks like a pencil-shaped piece of metal, ensures that the engine heats up quickly. Spark plug "firing" occurs when the engine is not hot enough for combustion and the heating element at the top of the spark plug is activated, thus accelerating the fuel ignition process. Over time, the glow plug relay will wear and eventually fail. As the colder months approach, you may notice that your car is not running as well as usual. If you suspect that the glow plug relay may be the culprit, read on to learn how to troubles...

How to test fuel rail pressure sensor with multimeter

Buscar este blog