Dragonchip ESD Manuale - Pagina 9
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Stampa la pagina3 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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