Monday, 29 May 2017

ground - Anti-static mat connected to earth directly or 1E6 ohm resistor?


Should an anti-static mat be connected to earth directly or with 1E6 ohm resistance in between?


2 layer mat. Upper side: dissipative (10E7 ~ 10E10 ohm/m²). Bottom: conductive.



To be a little more precise: connection to earth will be thru a CGP (common ground point) which is at earth potential. So, 1E6 ohm resistance or not, between mat and CGP?




In response to Lorenzo Donati: so, the workstation environment explained in Op Amp Applications Handbook, chapter 7, page 95, looks like this:


enter image description here


Why not the following setup? Note the wrist strap grounding, which i edited from the original image.


enter image description here


Now, instead of 2E6 ohm resistance to earth, there is 1E6 ohm between the wrist strap and earth. Is this enough?


Page 96: "Again, a 1E6 ohm, from the wrist strap to ground, is required for safety".




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