Are we not more interested in *total* charging current vs. Voltage? The maximum voltage is dependant on the collector size and leakage balance so i would assume a faster belt would provide for a potentially greater measured total current flow. That was my idea for using latex belts because I can get them moving really fast without flying off the rollers.
I have a nice old analog ammeter but the range is too high to get a really accurate reading. Im too scared to put my precious DMM in series with the 5 footer :) even without the collector it throws off decent sparks right off the belt :)
Matt
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----- Reply message -----
From: "ExtremeElectronics.co.uk" <tesla@xxxxxxxxxxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: [TCML] VDG belt materials
Date: Wed, Feb 3, 2016 6:31 PM
Doug,
Ive always found the black belts out perform the others, whether
neoprene, latex or pure rubber, I have no idea why.
Regarding your measurements, it is usual to quote a charging
current, rather than a voltage, 9MV did make me wonder just how big your
VDG test rig was, until I clicked that it was referring to 9mV. If you
know your meters internal resistance it should be fairly easy to convert
those voltage readings to uA
Cheers
Derek
On 03-Feb-16 7:05 PM, doug wrote:
> For those interested in VDG generators;
> I have been testing different belt materials with my VDG test fixture with some interesting results. The rollers are both PVC, one plain and one with metal coating and are setup for a 4 inch X 40 inch stretched belt. With the belt running at 412 RPM or about 1400 FPS the neoprene belt shows 9 MV, the gum rubber belt 3 MV and the blue exercise belt just over 1 MV. The neoprene and rubber belts are both 1/16 th inch.
> Draw your own conclusion but I vote 100% for the black neoprene!
> PS; I am not the best at understanding the scales on my multimeter so MV may not be the proper scale, but I think you can understand the difference in readings.
> Doug
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