Hi there. I need to determine the quality of the ground connections within a building. What kind of device should I use to determine this, and where can I get one?
What do you mean by "quality"? Sorry, but ever since I read "Zen and the Art of Motorcycle Maintenance" I always shudder at the term "quality".
I think there are two related issues - the resistance to ground of the grounding system and also the contact resistance of the bonding connections.
Even though you measure a low resistance to ground using a traditional ground tester, this does not necessarily tell you how the system will handle 30,000 amperes of current.
The resistance of the *connections* is best tested using a low-resistance Ohmmeter ("Ducter". This will give you some indication of how well the grounding system will handle high fault currents.