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  • olp58 commented on AndresR145's instructable E-Field Mill
    E-Field Mill

    Hi Andres, please have a look in the joined .pdf about my next steps with the field-mill. Best regards! Olivier

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  • olp58 commented on AndresR145's instructable E-Field Mill
    E-Field Mill

    Hi Andres,I made some more investigations during this weekend and in particular try to calibrate the system. The setup used is made of 2 metal plates (50cm x 40cm) spaced by 13 cm and the mill placed between them. I apply alternatively: +/- 40V, +/-20V, +/-10V and 0V to the plates. This produce differents values of field in the range on approx -300 to +300 V/m. See the enclosed curve. Now I have same interrogations... perhaps you can help me to understand....1. By applying 0V (Short circuit) to the calbrating plate, the instruments give a steady voltage of approx 46mV positive. This is the same as the instrument is placed in the cellar...so I suppose field is there near to 0... Why this positive offset?(Suspecting them, I remove the silicone brush and replace with cooper brushes but no d…

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    Hi Andres,I made some more investigations during this weekend and in particular try to calibrate the system. The setup used is made of 2 metal plates (50cm x 40cm) spaced by 13 cm and the mill placed between them. I apply alternatively: +/- 40V, +/-20V, +/-10V and 0V to the plates. This produce differents values of field in the range on approx -300 to +300 V/m. See the enclosed curve. Now I have same interrogations... perhaps you can help me to understand....1. By applying 0V (Short circuit) to the calbrating plate, the instruments give a steady voltage of approx 46mV positive. This is the same as the instrument is placed in the cellar...so I suppose field is there near to 0... Why this positive offset?(Suspecting them, I remove the silicone brush and replace with cooper brushes but no difference...)2. In my measurement setup my definition of the positive field is when I put the positive voltage on the plate UPPER the mill. But this induce a DECREASING voltage on the capacitor... for me it must be the contraries...???Today I installed the mill outside. Weather is more or less cloudy (variable 4/8 to 8/8) but calm, no wind, no storm. I get values on the capacitor in the range of 10 to 40 mV. This correpond to a positive field range from 150 to 1000 V/m.The more cloudy, the less the voltage. According the litterature, clouds are positive and earth is negative, so again for me the instrument reacts in an inversed way...What the Hell am I missing with this story of polarity??? Hi!Thank for your comments!

    Hi Andres,Many thanks for your comments and tips.-Il will try to calibrate using bigger plates, bigger distances and... bigger voltages!- Ok for my polarity confusion... I was convinced that I do this kind of mistake but unable to explain it...- For the offset, this appears only when the disk is rotating... I will continue to investigate.I will keep you informed of my next results, maybe with small break because tomorrow I have eye surgery and will be out of service for a few days.

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  • olp58 commented on AndresR145's instructable E-Field Mill
    E-Field Mill

    Hi Andres, thank you for your advice. At the moment I have a first setup with RESOPAL 6mm plate ant it seem to work very well, perhaps better than plexiglas because this material is very easy to work and very strong to folding so very goog rigidity.By the way, I ordered 1 meter of silicone conductive wire from the source you give in Germany and I received it 48 hours later here in Switzerland! Nice!For info, I use a 12V 2450 rpm capstan motor and a 68nF ceramic capacitor and the first results are very good. Voltages displayed in my lab (underground) are in the range off 0 to 300mV! I will go ahead, with OP amplifier and calibration!The presence of the shield plate is very important to get a good sensitivity!Many thank to share this smart idea of design!

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