At 05:30 14/07/2007, Chuck wrote:
>You might want to do a Google for "three point method" and "fall of >potential". These are the two standard methods for measuring grounding >resistance. You should easily find tutorials from manufacturers of testing >equipment. http://www.antennasbyn6lf.com/measurement_of_soil_characteristics/index.html gives an interesting take on trying to measure ground conductivity and other parameters at 1MHz and higher. Most of the traditional methods use power line frequencies; however, I've used the three point method using an AC generator at various frequencies up to 5 MHz, and ended up getting really confused with the results (decreasing conductivity with frequency....). Ran out of time, and never went back to it. I like Charles' idea of using an RF ammeter, though suspect milliammeter might be more appropriate if you're not using a transmitter. Starting with an ammeter is good; it's painful to see a good meter die because you underestimated the expected current. Let us know how it goes. best wishes, Nick **************************************************************************** Nick Hall-Patch Victoria, B.C. Canada **************************************************************************** _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
