I also believe you only air discharge to non conductive surfaces!
Michael Sundstrom, KB5UKT
KTL Dallas
802 N. Kealy Street
Lewisville,TX 75057
v (972) 436-9600 f (972) 436-2667
E-mail: msundst...@icomply.com
> -Original Message-
> From: Edward O'Toole ITS/ES-Box [SMTP:e...@itsqs.com]
> Sent: Friday, September 24, 1999 5:11 PM
> To: 'Jacowleff, Bill'; Emc-Pstc (E-mail)
> Subject: RE: Direct Contact Discharge into Vents to EN61000-4-2
>
>
> Hi Bill,
> The procedure for testing to the E.S.D. Standard (EN61000-4-2:1995)
> is to start with contact discharge towards reachable metal surfaces.
> Contact discharge is the prefered method. Air discharges shall be used
> where
> contact discharges canot be applied. You only use the air discharge gun on
> plastic material. Generally there is no discharge on plastic thus the
> reason
> for a higher level for air discharge.
> Hope this helps, for it just my opinion
>
> -Original Message-
> From: Jacowleff, Bill [mailto:bjacowl...@vdo.com]
> Sent: Friday, September 24, 1999 4:03 PM
> To: Emc-Pstc (E-mail)
> Subject: Direct Contact Discharge into Vents to EN61000-4-2
>
>
>
>
>
> > -Original Message-
> > From: Jacowleff, Bill
> > Sent: Friday, September 24, 1999 3:53 PM
> > To: EMC POST GROUP (E-mail)
> > Subject:Direct Contact Discharge into Vents to EN61000-4-2
> >
> >
> >
> > Greetings to all:
> >
> > I am testing a product that has small plastic modular housing with
> > vents to EN61000-4-2.
> >
> > At 8 kV Air discharge I have discharge to the open vents which is
> > fine, the PCB is protected on the perimeter and tolerates this well.
> >
> > However my question is with the Direct Contact Discharge to these
> > vented areas. I am under the impression of
> > where I have an air discharge I am to follow-up that area with a
> > Direct Contact Discharge. In this particular case the vents
> > are large enough to allow the tapered Direct Contact Discharge Tip
> > to fit deep enough in the vents, passing the perimeter protection
> > on the PCB and come in direct contact with one component on the PCB.
> >
> > So my question is How far should the Direct Contact Discharge Tip be
> > inserted into a vent? As far as it will reach? Or should the Direct
> > Contact Discharge Tip be limited to touching the outside wall of the
> > module near the vent?
> >
> > Thanks for your reponse in advance.
> >
> > Best Regards,
> >
> > Bill Jacowleff
> > VDO Control Systems
> > Airpax Instruments
> > 150 Knotter Drive
> > Cheshire, CT 06410
> > Phone: 203 271-6394
> > FAX:203 271-6200
> > bjacowl...@vdo.com
> >
>
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