AA epoxy is not 100% non-conductive??!

[IsaacHayes]

Ok, I put a heatsink in a 2C mag for a R/O mag, with AA expoy. Then I put down a thin layer of AA, let harden and put down a pedistal heatsink (older C's compared to new D's reflector doesn't come down anywhere near close enough). So that's 3 layers of AA. I put in 2C's and measured voltage though hot wire to the top of the heatsink, and measured .08volts. So it is conducting after all that. /ubbthreads/images/graemlins/mad.gif

I also tested a bare peice of it (dried AA) and it conducted.

Is this anything to worry about? It is conducting, but is this little bit anything to worry about?

 

[ErickThakrar]

It should not conduct at all. Are you sure that you're not getting metal to metal contact anywhere?
Also, are you positive you didn't end up with Arctic Silver epoxy? I know, silly question, but I have to ask /ubbthreads/images/graemlins/smile.gif

 

[PeterB]

The voltage of 0.08V isn't really much, could be also some kind of noise or offset voltage. You should try to measure current or resistance.

 

[Reptilezs]

arctic silver's website says arctic alumina is a pure electrical insulator, neither electrically conductive nor capacitive.

 

[LEDmodMan]

I've never had any problems like that.

 

[andrewwynn]

i just measured my thumb and it had more voltage on it... using a fluke 87... in any event, .08 v sounds like a capacitive voltage... put a resistor in the single digit K? from the test lead to ground and see if the V drops. If there is no load in your ckt and your MM has 20-40M? resistance, it's very easy to get funny readings.

Measure resistance not V.. if it reads OL... you've got no conductive path... the fluke will measure up to about 250M?. Measure v from ground to your various test points... .08V from hot to something that is supposed to be neutral is not good if it means it's charging the part to hot... but if it is it'll read 3V from ground.

I have used arctic silver and it showed to be non-conductive as promised.

 

[IsaacHayes]

I have a micronta from like the early 90's digital MM. Using resistance I get a reading of 0. But was messing around and figured I could tell more with voltage... Measuring voltage of your skin will be higher than what I measrued, as your body makes some electricity...

I think it's nothing to worry about but just found it surprising. I'll try measuring some plain plastic. I belive it is some sort of capacitive inductace or something too.