[Elecraft] ESD Safety

[Rick Dettinger]

Looks like the only solution is to work under water.  All of the  
voltages exceed the 30 volts  or so level we have heard cause damage  
to sensitive components.

73
Rick Dettinger   K7MW
====================================

On Jul 26, 2008, at 9:51 AM, Ron D'Eau Claire wrote:

>
> This is a subject that comes up here regularly among those working on
> their Elecraft (and other) rigs.
>
> Doing some research on a project, I ran across the following values
> published by Hewlett-Packard Company. They provide some insight about
> why it's important to use ESD-safe handling procedures.
>
> The "PCBs" mentioned below are, of course, Printed Circuit Boards, not
> the stuff found in old capacitors and transformers. "DIPs" are Dual
> In-line Pin integrated circuits such as found throughout Elecraft  
> rigs.
>
> Typical Electrostatic Voltage Levels
>
> Relative Humidity for each voltage level shown below:
> 10%
> 40%
> 55%
>
> Walking across carpet
> 35,000 V
> 15,000 V
> 7,500 V
>
> Walking across vinyl floor
> 12,000 V
> 5,000 V
> 3,000 V
>
> Motions of bench worker
> 6,000 V
> 800 V
> 400 V
>
> Removing DIPS from plastic tube
> 2,000 V
> 700 V
> 400 V
>
> Removing DIPS from vinyl tray
> 11,500 V
> 4,000 V
> 2,000 V
>
> Removing DIPS from Styrofoam
> 14,500 V
> 5,000 V
> 3,500 V
>
> Removing bubble pack from PCB
> 26,500 V
> 20,000 V
> 7,000 V
>
> Packing PCBs in foam-lined box
> 21,000 V
> 11,000 V
> 5,000 V
>
> Ron AC7AC
>
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