Dragonchip ESD Handbuch - Seite 9

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3 Machine handler for programming

Friction between movable parts, no matter conductive or not, can generate

ESD continuously while moving.

An effective grounding path is an earth wire (yellow/green, or black) between

movable conductive parts as shown below.

Below diagram illustrates the grounding path on a handler of a machine.

A handler consists of test probes mounting on a conductive part with insulator

separated, which then mounting on one end of a hydraulic cylinder and keeps

moving up and down. Even though all parts are conductive, but the contact in

between is not perfect after some days of consumption. Friction between the

cylinder and the rod generates the charges and induces on the test probe. To

minimize the ESD, a grounding path is jointed from the conductive part in the

handler to metal framework which is then jointed to the earth.

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The Prevention and Control of Electrostatic Discharge (ESD)

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