Figure A-20
Wearing an ESD wrist strap properly
l
Ensure that the ESD wrist strap works properly and its resistance ranges from 0.75
Mohm to 10 Mohm. Generally, the service life of an ESD wrist strap is two years. If the
ESD wrist strap resistance does not meet the requirement within its service life, replace it
with a new one.
l
Avoid contact between the boards and clothes because the ESD wrist strap cannot protect
operators from the static electricity caused by this type of contact.
l
Use an anti-static pad when replacing boards or chips. In addition to wearing the ESD
wrist strap, use ESD tweezers and extractors when inserting and removing boards and
chips. Do not touch chips and their pins with bare hands.
l
Keep all boards and components in ESD bags until they are to be installed. Place
temporarily demounted boards and components on the anti-static pad or other effective
antistatic materials. Do not use non-ESD materials, such as foam, plastic bags, and paper
bags to wrap or make contact with the boards.
l
Wear an ESD wrist strap before working on board terminals. Discharge cables and
terminal protection jackets using either contact discharge or air discharge before
connecting them to device terminals.
l
Save board packing materials, such as plastic boxes and ESD bags, for future use.
A.3.4 Lightning Protection and Grounding
This section describes the lightning protection and grounding requirements. Ensure that the
equipment room meets the requirements because lightning is one of the major factors that
causes damage to the USG.
lists the lightning protection and grounding requirements.
HUAWEI USG6000 Series
Hardware Guide
A Appendix
Issue 08 (2017-06-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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