Hey there, enginerds!
I was thinking about electrostatic discharge / ESD; what it is and how it works. I just watched a YouTube video about servers. Those servers have been decommissioned and unplugged from mains grid. The videographer touched some exposed RAM modules without wearing an ESD protection device, but he touched the metal case 1st, and therefore created equilibrium.
That got me thinking. What kills / damages ICs is the discharge, the arking and sparking, caused by a potential difference. But if the handler and the handled device have reached potential equilibrium, by touching the case, there'll be no discharge / ark / spark. So, the now connected system (handler + device) still has an electrostatic charge, a potential difference to earth ground.
Wouldn't that be a safe scenario, without actually being grounded to earth?
I guess it's safe, until the workspace system (bench + handler + device) suddenly connects to earth ground potential, right?
My point is, that grounding to mains earth is not actually necessary, as long as all parts of the whole workspace system "floats"(?) at the same potential.
Right? Correct me if i'm wrong.
A few more thoughts:
While i was writing this post, i thought about relevance; is this actually relevant, or am i answering my questions by investing thought in order to ask said same question. Then i thought about manual satellite maintenance, where there's no way one could possibly ground to earth. I guess, it comes down to potential difference.
Another question:
Are EVA tethers conductive; i mean, there are two entities in non-conductive vacuum, very likely to have a differential in static charge…? …there's probably a physical contact protocol; something similar to what helicopter crews have for high voltage cable maintenance. (EVA: Extra Vehicular Activity, in space flight, satellite maintenance) I'll forward this post to Scott Manley on twitter, maybe he gets a video idea out of it.