Appendix B: ESD Guidelines
Handling ESD assemblies
A general rule is that assemblies should be touched only when this cannot be avoi- ded in the course of the work that has to performed on them. Under no circumstan- ces should you touch device pins or circuitry when handling
You should touch devices only if
you are grounded by permanently wearing an ESD wrist strap or
you are wearing ESD shoes or ESD
Before you touch an electronic assembly, your body must be discharged. The simplest way of doing this is to touch a conductive, grounded object immediately beforehand (e.g. bare metal parts of a cabinet, water pipe, etc.).
Assemblies should not be brought into contact with
Assemblies should be deposited only on conductive surfaces (tables with an ESD coating, conductive ESD cellular material, ESD bags, ESD shipping containers).
Do not place assemblies near visual display units, monitors or television sets (minimum distance to screen > 10 cm).
Measuring and modifying ESD assemblies
Perform measurements on ESD assemblies only if
the measuring instrument is grounded (e.g. by means of a protective conductor) or
the measuring head has been briefly discharged before measurements are made with a
When soldering, use only grounded soldering irons.
Shipping ESD assemblies
Always store and ship assemblies and devices in conductive packing, e.g. metallized plastic boxes and tin cans.
If packing is not conductive, assemblies must be conductively wrapped before they are packed. You can use, for example, conductive foam rubber, ESD bags, dome- stic aluminum foil or paper (never use plastic bags or foils).
With assemblies containing fitted batteries, make sure that the conductive packing does not come into contact with or
SIMATIC Panel PC 670 / 870 Operating Unit, Equipment Manual | |
Edition 07/01 |