If the anti-static floor mat and anti-static ankle strap are connected together, do they still need to be grounded?
No, just the equipment being handled should be unplugged and electrically connected to the anti-static floor mat, as long as the conductive parts (body surface skin, anti-static floor mat, equipment chassis, operating parts, etc.) If you confirm that all conductive parts are connected to the ground, then these conductive parts are guaranteed to be at the same potential. Once there is a potential difference between the two conductors, it will lead to charge leakage. discharge generates static electricity.
The working principle of the anti-static wrist strap: the human skin is in direct contact with the static-conducting material on the wrist strap. When the wrist strap is grounded, the static electricity generated by the movement of the human body is quickly discharged through the grounding system; indicators: rubber disc type (white yarn/black yarn) ); electrostatic discharge time: less than 0.1s. This is a better quality wrist strap with the "Ohm" logo. The wrist strap is composed of elastic bracelets or Velcro loops, metal loops, rubber loops, spring wires, and alligator clips. It has the characteristics of fast power dissipation (S < 0.1 seconds), durability (spring wire is folded 30,000 times continuously), built-in 1MΩ current limiting resistor, and can be cleaned repeatedly.