Ken and EMC-PSTC colleagues, Apologies if this is already known, but a great deal of work on evaluating the inconsistencies of harmonic and flicker analysers has been done by Paul Wright of the UK National Physical Laboratory (NPL).
This work has been published in award-winning NCSL papers, but you may like to refer to NPL's dedicated harmonics/flicker web area at http://www.npl.co.uk/electromagnetic/dclf/harmonics_flicker.html The specific question of calibration techniques for instruments measuring fluctuating harmonics, for example, is covered at http://www.npl.co.uk/electromagnetic/dclf/fluctuating_harmonics.html I think you may find this work relevant to evaluating the discrepancies you are seeing. Bill Lyons -- Claude Lyons Limited, Brook Road, Waltham Cross, Herts EN8 7LR, UK Tel: +44 (0)1992 768 888 Fax: +44 (0)1992 788 000 email: [email protected] or [email protected] URL: http://www.claudelyons.co.uk Subject: Harmonics and Flicker repeatability/reproducibility Round Robin List-Post: [email protected] Date: Fri, 20 Feb 2004 07:03:25 -0800 From: "Hall, Ken" <[email protected]> To: <[email protected]> Cc: <[email protected]>, <[email protected]>, "[email protected]" <'[email protected]'>, <[email protected]>, <[email protected]>, <[email protected]> Hello, In the process of evaluating replacement equipment that meets the requirements of IEC 61000-3-2:2000/IEC61000-4-7 and IEC61000-3- 3+A1/IEC61000-4-15, I put together a small Electronic Load based on an old HP/Agilent verification process. Circuit = Relayand bypass switch to Lamp Dimmer with 200W bulb across line connected to - 3 -Glocoils in parallel with 2 Glocoils to other side of line.Parts availiability limited voltage to 120V. Well , I gathered three vendors equipments, performed a bunch of tests, with the following results: Stationary Harmonics - All very Close Fluctuating harmonics - All over the place Flicker,- With Lamp Dimmer and 200W Bulb - Large differences between Test Equipment, consistently the same. Since these results are all over the place I would like to set up a quick Round-Robin in the Sacramento/Bay Area , CA the first week of March. For scheduling I would bring the unit around to the Test laboratories with different Test Equipment that meets the "NEW" requirements and then schedule the others. Tests would consist of : Stationary Harmonics Fluctuating Harmonics Flicker with Dimmer and bulb - 10 Min Flicker without - 10 Min Thanks, Ken Hall Hewlett Packard 916-785-4819 This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
