Siemens OP5 Equipment Manual page 154

ESD Guidelines
E.2 Important Precautions against Electrostatic Discharge
Keep away from
plastics
Grounding
E.3 Handling ESD Assemblies
Rules for touching
and environment
E.4 Measuring and Modifying ESD Assemblies
Grounding the
measuring
instrument/
soldering iron
E-2
Most plastics are capable of carrying high charges and it is therefore
imperative that they not be placed near sensitive components.
When handling electrostatic sensitive devices, make sure persons, work-
places and packages are properly grounded.
A general rule is that assemblies should be touched only when this cannot
be avoided owing to the work that has to be performed on them. If you
have to touch them, under no circumstances should you handle printed
circuit boards by touching device pins or circuitry.
Devices may be touched only if
– you are grounded by permanently wearing an ESD wrist strap or if
– you are wearing ESD shoes or ESD grounding protection straps in
conjunction with an ESD floor.
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 – for example, bare metal parts of a switching
cabinet, water pipe etc.).
Assemblies should not be brought into contact with charge-susceptible
and highly insulating materials, such as plastic films, insulating table tops
and items of clothing containing synthetic fibers.
Assemblies should be deposited only on conductive surfaces (tables with
an ESD coating, conductive ESD cellular material, ESD bags, ESD ship-
ping containers).
Do not place assemblies near visual display units, monitors or television
sets (minimum distance to screen > 10 cm).
Measurements should only be made on assemblies when
– the measuring instrument is grounded – for example, by means of a
protective conductor or
– the measuring head has been briefly discharged before measurements
are made with a potential-free measuring instrument – for example, by
touching a bare metal control cabinet.
For soldering, you must use only a grounded soldering iron.
Manual OP5, OP15
( ) J31069-D0840-U001-A2-7618