Dear Ramsey

Our electrical ground and the ESD ground point are deferent , I mean that is
two deferent pits.

I checked and that are not open.Now I grounded our irons with same ESD mat
through a 1M resistor and disconnect the electric ground from the iron, then
I measure that the potential is coming around .5 to 2V in deferent irons. Is
that the safe at the EOS point of view actually we have a major failure in
laser sensor IC.

The iron we using Weller WTCP 50

Best regards and thanks for previous info.

Pankaj

> -----Original Message-----
> From: Guy Ramsey [SMTP:[log in to unmask]]
> Sent: Tuesday, February 10, 2004 6:28 PM
> To:   'TechNet E-Mail Forum.'; 'Karnwal, Pankaj'
> Subject:      RE: [TN] iron tip potential
>
> They should be the same, as Blair said. Sounds like the soldering iron
> and mat are not connected to the same "ground". This is not an ESD
> issue, rather an EOS issue and yes it could be very damaging. When the
> electrical system ground is open I have measured potentials between 40
> and 90 volts. That is where I would look first. What is the resistance
> to ground through the iron? Do you have a GFI on the solder iron? Check
> for a faulty ground at the outlet. Then check the AC box. How old is the
> building?
>
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Karnwal, Pankaj
> > Sent: Tuesday, February 10, 2004 4:26 AM
> > To: [log in to unmask]
> > Subject: [TN] iron tip potential
> >
> >
> > Dear all, hello
> >
> > My question about the potential deference between the
> > soldering iron tip and the ESD grounded mat. I observed that
> > it is about 20 to 30 volts, is it safe for ESD sensitive
> > device? and is it mandatory to keep the iron tip on same
> > potential with ESD grounded mat.
> >
> >
> >
> > Pankaj Karnwal
> > Jr. Engineer QA
> >
> > Barco Electronics System  (P) Ltd.
> >
> WWW.barco.com
> mailto:[log in to unmask]
>

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