How to Tell If a Micro Switch Is Bad or Faulty in Quality?

Micro switches are an essential component in many electronic devices, serving as a trigger mechanism that activates when a specific physical movement occurs. These switches are found in a wide variety of products, including gaming controllers, washing machines, and vending machines. As with any mechanical component, micro switches can sometimes fail or become faulty due to wear and tear. In this article, we will discuss how to tell if a micro switch is bad or faulty in quality.

Check for physical damage:

The first step in diagnosing a faulty micro switch is to check for any physical damage. Inspect the switch for any cracks, chips, or other signs of damage that may be visible. Also, check to see if the switch feels loose or wobbly when you press it. If the switch appears to be physically damaged, it is likely that it is no longer functional and will need to be replaced.

Test for continuity:

If the switch appears to be physically intact, the next step is to test for continuity. This can be done using a multimeter, which measures the electrical continuity between two points. Begin by setting the multimeter to measure resistance (ohms), and then touch one probe to each of the switch's terminals. When the switch is in its resting state (not being pressed), the multimeter should read infinity (meaning there is no continuity). When the switch is pressed, the multimeter should read zero (meaning there is continuity).

If the multimeter does not register any change when the switch is pressed, this indicates that there is no continuity, and the switch is faulty. If the multimeter always reads zero, even when the switch is not being pressed, this indicates that the switch is stuck closed and is also faulty.

 Horizontal Limit Switch

Check the actuation force:

The actuation force is the amount of pressure that is required to activate the switch. If the actuation force is too high or too low, the switch may not function properly. To test the actuation force, press the switch several times and note the amount of force required to activate it. If the force required to activate the switch is significantly different from what it should be, the switch is likely faulty.

Listen for a click:

When a micro switch is activated, it should produce an audible click. This click is the sound of the switch's contacts closing, which completes the electrical circuit. If the switch does not produce a click, this indicates that the contacts are not closing properly and the switch is faulty.

Test for bouncing:

When a switch is activated, the contacts may bounce a few times before settling into a stable state. This bouncing can cause issues with certain types of electronic devices. To test for bouncing, connect the switch to a circuit and activate it several times. If the circuit behaves erratically when the switch is activated, this indicates that the contacts are bouncing, and the switch is faulty.

Check for proper alignment:

Micro switches are designed to function properly only when they are properly aligned. If the switch is misaligned, it may not function correctly or may fail prematurely. To check for proper alignment, inspect the switch's actuator and ensure that it lines up correctly with the switch's contacts. If the actuator is misaligned, adjust it until it lines up correctly.

Check for dirt and debris:

Dirt and debris can cause micro switches to fail or malfunction. When debris builds up on the contacts, it can prevent them from making a proper connection, leading to a faulty switch. To check for dirt and debris, inspect the switch's contacts and actuator. If there is any buildup, clean it off with a soft-bristled brush or compressed air.