Bill,
I think that the only time that you would have to discharge to the interior
metal is if the vents are large enough to admit the standard "test finger".
This has a much more blunt shape than the contact point on an ESD gun.
Scott Lacey
-----Original Message-----
From: Jacowleff, Bill [SMTP:[email protected]]
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
> [email protected]
>
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