To be clear: EUT's which DO NOT meet the requirements when measured using test equipment compliant with EN61000-4-7:2002 and DO meet the requirements when measured using test equipment compliant with EN61000-4-7:1991 meet all applicable requirements for sale in the EU.
Until EN61000-4-7 is updated the transitional period is still in effect. Inter-harmonics measurements are NOT required to be in compliance with the current versions EN61000-3-2 and EN61000-3-12. Regards, Dave Spencer From: emc-p...@ieee.org on behalf of Jon Francis Sent: Fri 11/6/2009 1:31 PM To: Kunde, Brian; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Mains harmonics & flicker test equipment All, this may help with the original question about test equipment: Summary: Changes to 61000-3-2 are normally easily updated in the software of the measurement equipment. When a revised 61000-4-7 was published in 2002 it required significant measurement equipment hardware changes. Check that you measurement equipement conforms to EN61000-4-7:2002 and includes inter-harmonic grouping. Detail: 61000-3-2 describes limits and how those limits are applied to harmonic measurements. Changes to 61000-3-2 do not normally mean that the measurement equipment hardware needs to be changed, just it's limit checking software. However, Annex B of 61000-3-2 states: "The requirements for measurement equipment are defined in IEC 61000-4-7" 61000-4-7 describes exactly how the harmonic measurements must be made in terms of measurement techniques, equipment and measurement uncertainty. Now EN61000-4-7 2002 is very different to the previous version in that it describes in great detail the requirement to measure inter-harmonics at 5Hz intervals. (50,55,60,65... instead of 50, 100,150 Hz...) The inter-harmonics are then grouped into the normal 50,100, 150....Hz intervals such that the limits of 61000-3-2 can be applied as usual. This had a big impact on the measurement hardware because 10 times the processing is required in the same real-time duration (200ms). There is confusion because a small clause in the 2002 version states: "The use of existing measuring instruments based upon the requirements given in IEC 61000-4-7 (1991) continues to be permitted until the next revision of this standard". It can be argued that this clause still applies, but: CENELEC list EN61000-4-7 2002 as current with a DoW (of previous version) of 2005-10-01. CENELEC list EN61000-4-7:1993 as "Replaced / Withdrawn" EN61000-4-7:1993 is no longer available from the BSI website for example. (Listed as withdrawn). So to be up to date check your measurements are to EN61000-4-7 2002 and include inter-harmonic groups. Small caution: Because the inter-harmonics are grouped before checking against the limits of 61000-3-2 there is very little difference in the format of the displays and reports that you will see when making measurements. The actual measurements can be significantly different however. Products where current is drawn asynchronously of the ac line show significant measurement differences. A laser printer is a good example of this because it carries out all its principle functions, like moving paper, with no connection to the input line frequency and drawing significant current at inter-harmonic frequencies. Good manufacturers will supply evidence of the inter-harmonic grouping in action in the form of third-part calibration data. Jon from Voltech. From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: 01 October 2009 18:13 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Mains harmonics & flicker test equipment Ian, If you already have such equipment, a quick call or email to the manufacturer should answer your question specific to your equipment. Our equipment is from California Instruments and every couple years we ship our entire system (including the computer) to them for upgrades, new software, and calibration. They make sure we are testing to the latest requirements. They are the experts and they sit on the committees so I let them unburden me with such details. The Other Brian From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Gordon,Ian Sent: Thursday, October 01, 2009 11:03 AM To: IEEE EMC & SAFETY PSTC Subject: Mains harmonics & flicker test equipment All Does anyone know whether the 2006 version of EN61000-3-2 and EN61000-3-3 require the use of different specification test equipment than that required by the 2000 version of IEC 61000-3-2 and the 1994 version of IEC 61000-3-3? Ian Gordon --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- The contents of this email and any attachments are confidential and are provided solely for the use of the intended recipient(s). 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