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Re: [OT] Shocks in a large market. How to check ESD direction?


 

Hello everyone,

I've been carrying out expert assessments in the various fields of EMC for 40 years, and in the early years I was able to use a MONROE 175 electrostatic voltmeter to measure how people became charged. In 95 to 98% of cases, they were negatively charged.

But if there's one subject we couldn't care less about, it's whether the discharge is positive or negative. It's only the value of the peak voltage at which the person is charged that counts and has a direct influence on the effect and pain felt. I read at one point that the current value of relative humidity measured was only 20%. With such a low value, it's totally normal to become charged as soon as the person makes the slightest movement.

F1EKU

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