You need the 1MEG resistor. It's purpose is to dissipate the charge at a
non-instantaneous rate, protecting the electronic assembly and protecting
the operator.

James Head BEng MIET CID+

James Head PCB Design and Engineering
11 Charmind Walk,Winterbourne Road, SWINDON, SN25 1QA
Telephone: 01793 266237
Mobile: 07870 945579
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Website: www.jameshead.co.uk


On Fri, 17 Aug 2018 at 21:32, Vargas, Stephen M <[log in to unmask]>
wrote:

> All:
>
>       A quick ESD question. We would like to use 3'x4' static dissipated
> anti-fatigue mats at our SMT lines. The floor under these mats are coated
> with ESD wax and verified regularly. The question is whether the mats need
> to be grounded with a 1 megohm resistor or will the static charge dissipate
> naturally through the mat into the floor? Wiring is an option, but the
> wires tend to get damaged frequently through normal operator movement.
> Thanks in advance.
>
> Regards,
> Steve Vargas
>