[Elecraft] Radio Shack ESD mat doesn't meet spec

[Alan Bloom]

On Wed, 2008-02-27 at 19:23, AJSOENKE at aol.com wrote:
> In a message dated 2/27/2008 9:54:12 A.M.  Pacific Standard Time, 
> n1al at cds1.net writes:
> Well, I've convinced myself that  the Radio Shack portable ESD mat, P/N
> 276-2370 doesn't work  properly.
> 
<explanation deleted>

> Al  N1AL
> 
> 
> _______________________________________________
> Did the test standard you used tell you what the test device voltages  should 
> be. 

Yes, they specify it be tested with both 10V and 100V.  I used 15V for
my test since that was convenient.  

> Also, most Static dissipative mats have a texture which can  
> significantly reduce the actual surface contact area affecting the readings  considerably. 
>  I still think the best way to test is to fabricate a simple  electrometer 
> and connect the sensor (after charging) to the surface through  contact. 

That's basically what I did.  I used electrodes similar to the standard
ones specified in the standard.

> One big point - Mats do  age and 
> dry out becoming useless in a matter of a few years.

Dry out?  You mean they are wet?  :=)

Al N1AL