good day,first I want to please know the specific value of earthing system required to operate a highly sensitive printing machine (indigo 1050).

2.I have dig a very deep pit,put in salt,more saw dust and charcoal with a real cu rod just to improve my earthing system which is fluctuating during machine operation but still am not getting a specific value but keeps fluctuating b/n 3-6v,and giving me a very bad print out.
my question is what are the best materials and procedure apart from what I ve used so it can give me a low and specific value?
please help me am desperate.

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