Analysis and judgment of unidirectional conductivity testing of diodes

Date：2023-04-14 14:29:53Views：416

Diode unidirectional conductivity testing is one of the commonly used testing methods in electronic engineering, which can be used to determine whether the diode is in a conductive state and determine the characteristic parameters of the diode. In electronic circuits, diodes are commonly used for applications such as switching, voltage stabilization, and signal amplification. To understand the unidirectional conductivity of diodes, testing and analysis are necessary. In this article, we will introduce the unidirectional conductivity of diodes, which requires testing and analysis.

The principle of unidirectional conductivity testing for diodes

A diode is a basic electronic component that has a single conductivity, meaning that when the positive pole of the diode is connected to a positive voltage and the negative pole is connected to a negative voltage, the diode will conduct and current can freely flow through the diode. On the contrary, when the positive pole of the diode is connected to a negative voltage and the negative pole is connected to a positive voltage, the diode will not conduct and current cannot pass through the diode.

The principle of diode unidirectional conductivity testing is to determine whether the diode is conducting by measuring the direction of current flow in the diode. Specifically, when forward voltage is applied to the positive pole of the diode, the diode will conduct and current will flow to the positive pole. On the contrary, when forward voltage is applied to the negative pole of the diode, the diode will not conduct and current cannot pass through the diode.

Test method for unidirectional conductivity of diodes

One of the following two methods can be used to test the unidirectional conductivity of a diode:

Forward voltage testing method

In the forward voltage testing method, connect the positive pole of the diode to the positive pole of the power supply and the negative pole to the negative pole of the power supply, and then measure the voltage drop of the diode. If the diode is in a forward working state, the voltage drop at the positive pole of the power supply will be higher than the voltage drop at the negative pole of the power supply. This is because under forward voltage, the conduction resistance of the diode is very small, and current can flow through the diode.

Reverse voltage testing method

In the reverse voltage testing method, connect the negative pole of the diode to the positive pole of the power supply, connect the positive pole to the negative pole of the power supply, and then measure the voltage drop of the diode. If the diode is in reverse operation, the voltage drop at the positive pole of the power supply will be lower than the voltage drop at the negative pole of the power supply. This is because under reverse voltage, the conduction resistance of the diode is high, and current cannot pass through the diode.

By testing and analyzing the unidirectional conductivity of the diode, it can be determined whether the diode is working properly and effectively prevent its failure or damage. So that's all for today's content sharing. If you find it helpful, please follow Chuangxin Testing. We will provide you with more industry information!