[SI-LIST] Re: Guard Rings ... DC

  • From: DAVID CUTHBERT <telegrapher9@xxxxxxxxx>
  • To: keithK EPD <epd2001usa@xxxxxxxxxxx>
  • Date: Fri, 19 Nov 2010 05:12:50 -0700

Conformal coating over guard traces can reduce their effectiveness. I put no
conformal coating on most guard traces.
  Dave Cuthbert

On Thu, Nov 18, 2010 at 8:24 PM, keithK EPD <epd2001usa@xxxxxxxxxxx> wrote:

> I am dealing with DC  !   so, some of my questions are not for the entire
> High speed audience, so I apologize
>
> I have a 4 gig ohm electrode/electrodes(s) ..... my electrode spacing is
> 0.230" and my socket has a 0.175" diameter / 4 layer
>
> I haven't seen much lit on the subject -
>
> PCB material / voids / components / etch width to the 1 resistor into the
> opAmp / given 0.060"  / slots req'd
> what does conformal coating do for me....
>
> comments, pointers to white papers, etc are welcome.
>
>
> Keith Kowal
>
> www.product-designs.com
>
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