Slide Switch Manufacturer Discusses How Normally Open and Normally Closed Push Button Switches Differ and Their Application Scenarios
Release Date:2023-02-07
Slide switch Manufacturer explains how normally open and normally closed push-button switches differ, and how to accurately measure normally open and normally closed contacts using a multimeter:
1. First, set the multimeter to the continuity mode, which is also the diode buzzer mode. Then use the two probes to separately touch the two contacts of the button. If it beeps, it means the contact is normally closed (NC); otherwise, it is normally open (NO). You can press the button and measure again, and you will find the result is exactly the opposite.
2. First, set the multimeter to the resistance mode, about 1K. Use the two probes to separately touch the two contacts of the button. If there is a resistance value, it is a normally closed contact (the resistance value is very small, normally between 0.2-1, which is the internal resistance of the multimeter). If there is no resistance value, it is a normally open contact. You can press the button and measure again, and you will find the result is exactly the opposite.
Some situations require normally open contacts, while others require normally closed contacts. For example, the start button needs normally open contacts, and the stop button needs normally closed contacts. To be versatile, push-button switches usually come with two normally open and two normally closed contacts.
Article from http://www.blyifeng.com
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