[Elecraft] "Metal muffin baking tins are good" -- was " K3 ESD"

[David Gilbert]

That's no guarantee of anything.  It doesn't address the issue of 
instantaneous static dissipation from the component to the muffin tin 
itself (which has capacity to its surroundings and acts as it's own 
charge sink).  Reread Gary's comment about surface conductivity.

Dave   AB7E



On 12/18/2010 5:10 PM, Ron D'Eau Claire wrote:
> To avoid damage just follow the same protocol as you would when installing
> the part in a circuit board.
>
> Ideally the tin would be grounded through a 1 meg resistor.
>
> Ron AC7AC
>
> -----Original Message-----
> In reference to the subject of proper ESD protocol, Fred (K6DGW) just posted
> "Metal muffin baking tins are good".  Please note that this is INCORRECT.
>
> If a metal muffin baking tin (or any conductor for that matter) were brought
> into direct contact with an ESD sensitive device, and the two were not
> already at the same potential, then the rapid momentary current flow (i.e.
> discharge) could easily zap the ESD sensitive device.
>
> ESD mats have a specific surface resistivity to ensure that any potential
> difference -- between the mat and devices placed on it -- is gradually
> dissipated over a period of several seconds, as opposed to (I'd guess)
> somewhere on the order of a few micro seconds for a metal muffin tin.
>
> Thus the instantaneous current surge (when coming into contact with the
> muffin tin) would be on the order of a million times greater.
>
> 73,
> Gary  KI4GGX
> K3 #2724
>
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