Sliding switch manufacturers talk about the key switch normally open normally closed how different and application scenarios
Sliding switch manufacturers talk about how the key switch normally open and normally closed is different, with a multimeter to accurately measure the normally open and normally closed contacts:
1, first of all, the multimeter is switched to the break, that is, diode buzzer, and then use two pens to separate the two contacts of the contact button, if the ring, it means that the contact is normally closed point (NC), otherwise it is normally open point (NO). We can press the button to measure again and find the result is just the opposite of the above.
2, the first multimeter to the electric obstruction, that is, 1K, with two pens separated from the contact button of the two contacts, resistance value is normally closed point (resistance value is very small, under normal conditions between 0.2-1, this is the internal resistance of the multimeter), no resistance value is normally open point. We can press the button to measure again and find the result is just the opposite of the above.
Some occasions need to use normally open contact, some occasions need to use normally closed contact, such as the start button to use normally open, stop the key to use normally closed, in order to be universal, the key switch is usually equipped with normally open and normally closed 2 contacts.
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