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On 2/26/18 7:02 PM, wesb@xxxxxxxxxxxxx wrote:
I once got what seemed to be a reasonable measurement of the voltage of
an NST by making a voltage divider from a long (3-4 feet), shallow
(probably 1/8" deep) trough of tap water (needs to be very level). Used
a little hand held dvm (with meter movement; not electronic) to measure
a small distance in the water. It gave a reasonable measurement after
measuring distances, and measuring several different gaps between the
DVM probes, showed the proper expected linearity, on comparison.
This works, but you have the frequency response problem. I've used 10
feet of plastic tubing with copper sulfate solution.
Folks use 4" diameter PVC pipe 6 feet long to make "dump resistors" for
marx banks.