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Re: [TCML] VDG belt materials

Doug,
From what you have said it is likely to be a charging current of 40uA e.g about 40 on the 50uA scale. I'm guessing that the voltage reading you were taking would be limited by this current anyway, therefore the meter position would be the same. 
    As long as the meter stays connected, it will be a virtual dead 
short. This would be true of the DMM too. Just make sure the device is 
discharged when connecting it and on a current scale. I use mine 
regularly on my VDG (discharged and no topload) and haven't killed it yet.

    It is a very useful way of comparing setups and materials.

    Cheers
        Derek

On 04-Feb-16 4:18 PM, doug wrote:

Hi Derek;  My Multimeter is a, MASTECH-KT7006A/7224, Analog . And I 
admit to much ignorance in reading it.
With the dial set to the 0.5 range on the DCV.A side I get  around 40 
in the 0 to 50 range, or about 9 in the 0 to 10 range. I get the same 
reading with the 0.1/50ua setting.

I was just guessing on what the numbers represented.

As Always I appreciate any comments that will help me understand this 
stuff. It would be nice if someone down at the GEEK GROUP would help 
me understand my meter but they always seem quite busy when I stop in 
there. [Message sent].

Thanks Derek, Doug

-----Original Message----- From: ExtremeElectronics.co.uk
Sent: Wednesday, February 03, 2016 7:31 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] VDG belt materials

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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