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Old 9th January 2007, 07:01 PM   #1
gvy is offline gvy  Belgium
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Join Date: Dec 2006
Default neoprene spacers

Hi everybody,

I am currently building 4 esl with wire stators.

The frame is made of standard furniture panel with melamine toplayer
I measured it out with a megger on 2500V and it is totally non conductive (resistance almost 1 Terraohm)
On that frame I glued the statorwires, which are isolated copperwires.

Now on that frame I glued the spacers. Those are 2mm neoprene strips fixed on the frame with double sided extra strong tape.
Now her is (maybe) a problem.
I got suspicious because I read here that neoprene seems to be not at all that good isolator I thought it was.
So I measured and yes , when I put both probes of the megger (2500V) on the neopren surface I get 300Mohms.

This is less then the surface resistance of the coated membrane.

Not good I think.

BUT, on the other hand.....
Is there really a problem????

Because the spacers are fixed on a totally non conductive frame and
The statorwires are isolated wires also fixed on that non conductive frame. Is there really a problem?????

If I measure the resistance between the copper of the statorwires and the neoprene spacer again with a megger on 2500V I get a resistance around 40Gigaohm

So I think the neoprene spacers do not a good job as isolator, but It doesnt really matter in my kind of construction.
I like them as spacer because the rubber has a dampenning effect on the membrane and they are easy to work with.

I have a set of esls for about 4 years with the same construction and they play well. It's just..... because I maesured it , I started to doubt....

Geert
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