Siemens S5-135U/155U appendix Ensure Sufficient, Avoid Direct, Contact

Guidelines for Handling Electrostatically-Sensitive Devices (ESD)

B.3 General Protective Measures Against Electrostatic Discharge Damage

Ensure Sufficient	Make sure that the personnel, working surfaces, and packaging are
Grounding	sufficiently grounded when handling electrostatically-sensitive devices.
	You thus avoid electrostatic charging.
Avoid Direct	You should touch electrostatically-sensitive devices only if it is unavoidable
Contact	(for example, during maintenance work). Hold modules without touching the
	pins of components or printed conductors. In this way, the discharged energy
	cannot affect the sensitive devices.
	If you have to carry out measurements on a module, you must discharge your
	body before you start the measurement by touching grounded metallic parts.
	Use grounded measuring devices only.

B-4	System Manual
	C79000-G8576-C199-06