How to test a rectifier diode, and how they work

How to test a rectifier diode, and how rectifier diodes work Steps See Zener diode

Summary: Learn how rectifier diodes work, and how to test them with a multimeter.

Rectifier diodes diode block the flow of current in one direction, working like a check valve would in a water flow system.

This type of diode is useful in converting AC to DC because it will only allow electricity to enter in one direction and the current continues to flow through it to the output side of the diode.

You would no longer get the "alternating current" in the output circuit because now the current is flowing in one direction only (DC).

	To test out a diode, first you will have to set your digital multimeter to the diode setting, which is usually part of the Ohms (resistance) section on the meter. If you are using an analog meter, then set it to the lowest Ohms Ω setting. You should now disconnect at least one side of the diode if it is still in the circuit. Finally check resistance across the diode, then check again but swap your leads to the opposite side they were on for the first reading. If you get an open (meter doesn't move) one way, but some kind of reading the other way, then the diode is good. If you get a reading (meter moves) both ways, then the diode is shorted. If you get an open (no movement) both ways, then the diode is open. A typical rectifier diode See more how-to articles