Lpc2000

Landrum Haddix wrote:

>TomW,
>We use a gun and step from a couple of KV to +/-25KV.
>All of my connector pins pass though these surge devices
>we use called SurgX that will clamp the pulse to 30v and turn
>on in about 50ps. My connectors can handle being hit directly.
>
>  
>
This almost sounds like a High-Energy Laser controller...


>However our board is mounted in a metal frame which they
>also shoot with the gun. At first we had the board isolated from
>the frame, but the only way out for the pulse is the ground plane
>on the board so it flashes over to the board. (As much as 3/4"!!!)
>
>I stopped this by giving the board a low impedance ground to the
>frame so the whole thing bounces up and down as quickly as possible.
>This prevents component damage, but still apparently leaves gradients
>that will freak out the ARM.
>
>  
>
Well, all I can say is that I am glad it is you and not me with this 
problem.  In the field that I do stuff, if we had that much voltage 
dancing around the metal enclosure, it won't matter what the outcome 
would be... heh  We only have to deal with the vulnerability of the 
external connections.


TomW


-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
----------------------------------------------------