The 'Earth' For Reference - Advantech ADAM-5510/P31 Manual

Unfortunately, it's impossible to finish the system integration task at a
time. We always meet some troubles in field. Such as communication
network or system isn't stable, noise influence, and equipment is
damaged or hungs up by thunders. However, the most possible issue
is just the improper wiring; ie, grounding and shielding. As you know
the 80/20 rule in our life: we spend 20% time for 80% works, but 80%
time for left 20% works. So to system integration, we paid 20% cost for
Wire / Cable and 80% cost for Equipment. However, 80% reliability
depends on Grounding and Shielding. In a word, we just need to pay
20% investment and work on those two issues to get a high reliable
system.
This application note will bring you some concepts about field
grounding and shielding. Below topics will be illustrated in 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