4 EMC and ESD Measures
4.2 ESD measures
Handling of ESD modules:
When you are handling ESD-sensitive devices, make sure that you, your
workplace and the device packaging are grounded well.
Do not touch electronic modules unless it is absolutely essential for the
work to do on it. When handling p.c. boards, never touch the module pins or
Do not touch ESD-sensitive components unless
– you are grounded by means of an antistatic wristband,
– you wear antistatic footwear or ground straps when walking on an anti-
Place sensitive modules only on high-resistance, conductive surfaces (table
with antistatic surface, conductive antistatic foam or antistatic packaging).
An exception are modules with their own power supplies (e.g. battery).
These may not be placed on conductive surfaces, as this might result in
short circuits and thus destroy the component on the module.
Do not bring ESD-sensitive modules into the vicinity of visual display units,
monitors or TV sets (minimum distance to the screen > 10 cm).
Do not bring ESD-sensitive modules into contact with chargeable and
highly-insulating materials, such as plastic, insulating table tops or clothing
made of synthetic materials.
Measurements on ESD-sensitive modules may only be carried out if
– the measuring instrument is grounded (e.g. using a protective conduc-
– the measuring head is discharged for a short time prior to the measure-
ment (e.g. by touching a bright control housing).
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition