How do you test a diode rectifier?

A diode is a device that allows current to flow in only one direction. It has two terminals, the terminals are anode and cathode. How do you test a diode rectifier? When the anode terminal of the diode is connected to the red probe of the multimeter and the black probe connected to the cathode, the diode will be forward biased. In a forward bias, for silicon diode voltage drop is 0.7 V. For germanium it is 0.25 V to 0.3 V. Now, reverse the terminals of the multimeter by connecting the red probe to the cathode and anode to the black. In this condition, there is no current flow. The meter must show OL which means an open circuit. If these values are not shown properly by the multimeter then there is a defect in the diode.

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