Physical Tampering

Physical tampering is defined as the physical activities performed to prevent the energy meter measuring. This includes the following methods:

  1. 1.Top cover open.
  2. 2.Bottom cover open.
  3. 3.Inserting metal objects to prevent measurement, etc.

This type of physical tampering can be prevented by using the tamper detection feature of SAM L22.

It can be implemented as follows.

Connect one of the tamper input pins to a switch connected to the case cover of the energy meter. If someone attempt to open the case cover the switch will be pressed (edge detection happens), which in turn gives a tamper indication. Hence, if the user attempts to open the case cover of the energy meter tamper will be detected.

Inserting metal object can only be done when the case cover is opened.