I do not know why the 4kV air discharge was defined for the Basic immunity environment in the original 61326. I can only think it was an error. I am aware of no other standard that sets such a low ESD level. The 4kV level also makes little sense given that the Controlled immunity environment (which assumes a lab environment with expert operators knowledgeable about EMC) has a higher air discharge level than the Basic environment (which assumes an unknown environment and operators with no EMC knowledge).
Also, my understanding is that there should be a clear rationale for a product family standard to define a level not consistent with the generic standards. If this is the case, then, in my opinion, there is no reason why a product within the scope of 61326 should not be required to or able to meet the ESD levels required of all other electronics. There is always the ESD Sensitive label..... Thanks, Ross. From: "Doug Kramer" <[email protected]> To: "IEEE EMC & SAFETY PSTC" <[email protected]> List-Post: [email protected] List-Post: [email protected] List-Post: [email protected] Date: 06/08/2009 05:42 PM Subject: RE: EN61326-1: 2006 Sent by: [email protected] ________________________________ The question I then raise is, why? Since the standard has been that way for some time (pre 2000), has there been an interference or safety issues raised by the current levels? If it is to just bring it in line with standards that is really not a technically sound argument. It will force hundreds of manufacturers to spend money again (by my estimate about $500/product for testing and reports) after they just finished spending coming in line with the above 1GHz RF immunity requirement. My opinion. Thanks, Doug From: [email protected] [mailto:[email protected] <mailto:[email protected]> ] On Behalf Of Ross Carlton Sent: Monday, June 08, 2009 4:27 PM To: Gordon,Ian Cc: IEEE EMC & SAFETY PSTC Subject: Re: EN61326-1: 2006 This is a little late, but - I am the U.S. expert assigned to the maintenance team for IEC 61326-1. The disconnect in the required ESD levels for the Basic immunity environment is known. It will be resolved in the next revision of the standard - currently in progress - that should come out in late 2010 or early 2011. Unfortunately, the solution will be to increase the air discharge requirement from 4kV to 8kV to be in line with the rest of this standard as well as the generic standards. Regards, Ross Carlton Sr. EMC Engineer National Instruments (512) 683-6392 [email protected] From: "Gordon,Ian" <[email protected]> To: "IEEE EMC & SAFETY PSTC" <[email protected]> List-Post: [email protected] List-Post: [email protected] List-Post: [email protected] Date: 05/18/2009 06:21 AM Subject: EN61326-1: 2006 Sent by: [email protected] ________________________________ All There seems to be a typographical error in Table 3 of the above standard where the levels specified for ESD testing in controlled environments are given as 4kV/8kV (air/contact). However the level for the same test given in Table 1 which refers to Basic Immunity Requirements is only 4kV/4kV (air/contact). This seems wrong since the controlled EM environment would be inherently less severe. Does anyone else believe this to be the case? 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