Chassis usually means the metal structure that holds the electronic devices. In the days of vacuum tubes it was the metal plate on which the tube sockets were mounted. Today it can be any mechanical structure that holds the components
The chassis is often grounded (earth ground) for safety purposes if it possible for the user to come in contact with it. It may be used as a zero volt referance ground for the electronics. Whether the chassis is grounded and how it used is dependant on the application and the local safety requirements.
I have never heard of the term "body ground" being used for anything.
Dan
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Dan Hollands
1120 S Creek Dr
Webster NY 14580
585-872-2606
dhollan3@rochester.rr.com
www.QuickScoreRace.com
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