Читать книгу The ESD Control Program Handbook - Jeremy M. Smallwood - Страница 59

If a charged object is placed within a closed hollow conducting object such as a box, then the field lines from the charge couple to the surrounding conductor (Figure 2.10). The net charge contained within the conducting box induces an equal net charge on the box.

This principle is used to measure electrostatic charge on items by placing the charged item in a container, which is known as a Faraday pail.

If the container is grounded, then the outside world is shielded from electrostatic fields arising from the charges. If it is not grounded, then it is itself a charged object and can be a source of ESD.