1. System Installation Requirements
1-30
TI 33Q01J10-01E
1.5.2 Countermeasures against Static Electricity
Take countermeasures against electrostatic damage when handling cards with semi-
conductor IC components, for maintenance or to change settings.
Observe the following to prevent electrostatic damage:
• When storing or carrying maintenance parts, keep them in a conductive bag (when
delivered from the factory, they are packed in such bags with labels warning about static
electricity).
• When doing maintenance work, wear a wrist strap connected to a ground wire with a
grounding resistance of 1 M ohm. Be sure to ground the wrist strap.
F010503.ai
1 M ohm
Wrist strap
Connect to earth terminal or
unpainted part of frame (grounded)
1 M ohm
Wrist strap
Conductive sheet
Grounding resistance
of 1 M ohm
When working with a card with battery (power
supply unit) on a conductive sheet, set the
BATTERY ON/OFF switch to the OFF position
or remove the battery
Figure Example of Use of A Wrist Strap and Conductive Sheet
• When working on cards: keep conductive sheets, grounded via a resistance of 1 M ohm, on
the work bench. Wear a grounded wrist strap. Remove electrostatic plastics from the work
bench.
• Be sure to wear a wrist strap and use a conductive sheet when handling maintenance parts.
• Wrist straps and conductive sheets are available from Yokogawa.
Sep. 30, 2008-00
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