frequency horizontal noise effects. However a plastic casing may be used in special
circumstances, for example if the site includes highly saline groundwater that would attack
steel, or if there is a weight limit for transporting materials to the site. In these instances, a
separate earth ground should be constructed via a suitable ground stake or buried screen.
Connect the case ground of the digitizer to the earth ground, and connect the case ground of
the seismometer and all other equipment to case ground of the digitizer via cable ground
shields as described above.
Figure B-2 - System grounding for burial in a metal-cased hole
Appendix B - Grounding guidelines
16889R10 • 2020-11-12 Page 92
To Next Page
Loading...