3-3
Hold a card, module, or circuit board by its edges when observing or moving it, avoiding direct
contact with the components on it.
Use of an ESD-preventive wrist strap
Follow these steps to wear an ESD-preventive wrist strap:
Step1
Put the ESD-preventive wrist strap around your wrist.
Step2
Tighten the fastener to ensure good skin contact.
Step3
Attach the alligator clip to the ESD-preventive wrist strap.
Step4
Attach the alligator clip to the rack.
Step5
Make sure that the rack is well grounded.
Figure 3-2
Wear an ESD-preventive wrist strap
(1) ESD-preventive wrist strap
(2) Fastener
(3) Alligator clip
For the sake of safety, check the resistance of the ESD-preventive wrist strap. The resistance
reading should be in the range of 1 to 10 megohms between human body and the ground.
The U200 series are not delivered with ESD-preventive wrist straps. Make sure that an
ESD-preventive wrist strap is available yourself.
Electromagnetic Interference Prevention
All interference sources, external or internal, adversely affect the device in the way of capacitance
coupling, inductance coupling, electromagnetic radiation, or common impedance (including the
grounding system) coupling. To minimize the impact of interference on the device, follow these
guidelines:
Take effective measures against interference from the power grid.
Separate the protection ground of the device from the grounding device or lightning protection
grounding device of the power supply equipment as far as possible.