I agree with Edward, Contact discharge is meant to address operator accessible parts. To deliberately go poking the point through vents defeats the object of the test.
Best regards, Derek. Edward O'Toole ITS/ES-Box wrote: > 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). -- Derek Walton Owner L. F. Research EMC Design and Test Facility 12790 Route 76, Poplar Grove, IL 61065. www.lfresearch.com --------- 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).
