Re: Radio Shack ESD mat doesn't meet spec

Posted by Alan Bloom on Feb 28, 2008; 7:09am
URL: http://elecraft.85.s1.nabble.com/Radio-Shack-ESD-mat-doesn-t-meet-spec-tp462383p462385.html

On Wed, 2008-02-27 at 19:23, [hidden email] wrote:
> In a message dated 2/27/2008 9:54:12 A.M.  Pacific Standard Time,
> [hidden email] 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


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