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Matt,
what kind of HV source are you using to power the corona generator?
There must be some place where the low potential end of the HV circuit
connects to ground. You could safely insert your DMM running in current
mode between the low end of the HV supply and ground to monitor the
corona current.
More risky, but technically possible for a one time measurement, would
be to insert the DMM in series with the high potential end of the
circuit -- between the supply and the corona electrode. You would just
have to float the DMM and its leads away from any grounds, and be
certain not to touch it during operation. A quick and dirty platform
made of 4 clean Styrofoam hot cups with a top surface of corrugated
cardboard could support the meter and leads on a temporary basis.
Dave
On 9/25/2015 12:19 PM, msweeney23@xxxxxxxxx wrote:
Im facing this problem and i dont know enough to figure it out.
If i have a HV source used to produce only corona (bottom brushes on a VDG) what voltage drop would occur across a resistor in series? Without this i cant determine expected power dissapation.
I cant assume the corona source shorts directly to ground (the roller is grounded) there must be some specific resistance (impedence?) Of the plasma between the brushes and grounded roller but i really dont know what that would be without directly measuring it, and i cant do that with my digital Meter. I could use an analog meter to measure total current flow but at these voltages im concerned even that could pose problems (approx +/-10KV DC).
Any help would be greatly appreciated!
Thanks,
Matt Sweeney