large value resistors

[Ian Fritz]

Martin et al. --

Here's a fairly standard demo: Take a bare BNC panel connector and pot
up the terminal end with a fat blob of 5-minute epoxy. After it cures
plug it into a good laboratory electrometer - ohmmeter. You will usually
read over 10^14 Ohms (100 TOhm). This is an indication of what ordinary
plastics will do.

  Ian 

Martin Czech wrote:
> 
> :::>
> :::> > 1 megamegohm (1,000,000,000,000 ohms)
> :::> >
> :::> Tetraohms.  I didn't even know they made these that high.
> :::
> :::Does that make any sense in normal environments? I'd expect even the
> :::resistance of air humidity to be below that...?
> :::
> :::But maybe those components are only usable when sealed. And probably after
> :::weeks of doing flux removal...
> 
> Bob Pease: What's all the femtoampere stuff anyhow?
> 
> Obviously one can go down to femtoamperes with normal plastic packages...
> 
> m.c.