User manual

Appendix C
Grounding Reference
Field Grounding and Shielding Application
Overview Unfortunately, it’s impossible to finish a system
integration task at one timC. We always meet some trouble in the field.
A communication net- work or system isn’t stable, induced noise or
equipment is damaged or there are storms. However, the most usual
issue is just simply improper wiring, ie, grounding and shielding. You
know the 80/20 rule in our life: we spend 20% time for 80% work, but
80% time for the last 20% of the work. So is it with system integration:
we pay 20% for Wire / Cable and
0% for Equipment. However, 80% of reliability depends on Grounding
and Shielding. In other words, we need to invest more in that 20% and
work on these two issues to make a highly reliable system. This
application note brings you some concepts about field grounding and
shielding. These topics will be illustrated in the following pages.
1. Grounding
1.1 The ‘Earth’ for reference
1.2 The ‘Frame Ground’ and ‘Grounding Bar’
1.3 Normal Mode and Common Mode
1.4 Wire impedance
1.5 Single Point Grounding
2. Shielding
2.1 Cable Shield
2.2 System Shielding
3. Noise Reduction Techniques
4. Check Point List
C-2 ADAM-5000/TCP User’s Manual