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: [email protected] > -----Original Message----- > From: Edward O'Toole ITS/ES-Box [SMTP:[email protected]] > 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:[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] > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
