On 2/27/18 5:36 AM, wesb@xxxxxxxxxxxxx wrote:
I'd be surprised if frequency response were the only problem, but if so,
mightn't that be calibrated and accounted for? This is just an
experimental measurement, after all. When researchers design
experiments, calibrating out an uneven response is done all the time
with exotic sensors.
It's a bit tricky, because you're making a measurement at lots of
frequencies, and the frequency and phase response will vary wildly
over the band of interest (ranging from close to DC (line frequency)
up to several MHz)
Certainly do-able these days - get the impulse response and deconvolve
it with the measurement.
Wes B.
On 2018-02-26 23:07, jimlux wrote:
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.
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