How many steps can be taken before a motion detector activates according to UL?

How many steps can be taken before a motion detector activates according to UL?

• A. 2 steps
• B. 3 steps
• C. 4 steps
• D. 5 steps

Answer: (C)

The determination that a motion detector activates after 4 steps is based on the standards set by Underwriters Laboratories (UL). These standards are intended to ensure a balance between sensitivity and reliability in alarm systems. When designing a motion detector, considerations about false alarms must be taken into account. Too many activations from minimal movement could render the system unusable. Therefore, UL has established guidelines indicating that a motion detector should ideally activate after the detection of a certain number of steps, which is defined as 4 in this case. This means the device is designed to recognize when a person is making a deliberate effort to move within its range, rather than being triggered by incidental movement or environmental factors. In summary, UL’s guidelines specify that a motion detector will typically become active after detecting 4 steps to ensure it is functioning correctly while minimizing false alerts.

The determination that a motion detector activates after 4 steps is based on the standards set by Underwriters Laboratories (UL). These standards are intended to ensure a balance between sensitivity and reliability in alarm systems.

When designing a motion detector, considerations about false alarms must be taken into account. Too many activations from minimal movement could render the system unusable. Therefore, UL has established guidelines indicating that a motion detector should ideally activate after the detection of a certain number of steps, which is defined as 4 in this case. This means the device is designed to recognize when a person is making a deliberate effort to move within its range, rather than being triggered by incidental movement or environmental factors.

In summary, UL’s guidelines specify that a motion detector will typically become active after detecting 4 steps to ensure it is functioning correctly while minimizing false alerts.