Another possibility is adjusting power factor to account for the filter effect. This is a common effect and a chamber outfitted with such filters often has remotely-controlled power factor correction. A long time ago, when chamber EMI filters cut in at 150 kHz instead of 10 kHz, the impact wasn¹t as pronounced, but there just isn¹t enough space between a ~1 kHz pass band and 10 kHz 100 dB stop-band for the filters to have zero effect at 400 Hz.
Ken Javor Phone: (256) 650-5261 From: John Woodgate <j...@woodjohn.uk> Organization: J M Woodgate and Associates Reply-To: John Woodgate <j...@woodjohn.uk> Date: Wed, 27 Oct 2021 13:32:22 +0100 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Filter Issues [General Use] The filter is probably designed for 50Hz or 60 Hz mains. It probably isn't saturating at a higher input frequency, but your voltage measurements indicate that it may be resonating. I think you need a filter specifically designed for 400 Hz mains. ============================================================================ ========== Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk <http://www.woodjohn.uk> Rayleigh, Essex UK Istae nunc praetereunt nisi non ubicumque On 2021-10-27 10:56, Price, Andrew (Leonardo, UK) wrote: > > > > Hi members > > > > Can anyone offer some advice. > > Have issues with EMC Chamber RF Filter 3 phase. > > Using 115V 400Hz single phase supply from a static convertor, filter looks > like it is saturating. > > Ambient levels failing between 6kHz to 150kHz. > > Voltage of phase at static convertor 115.8Vrms but at EUT on bench 132Vrms > > > > Regards > > Andy > > > > > > Andrew Price > Integrated Sensing & Protection (ISP) > > Prinicpal Environmental Engineer (EMC) > > > > Leonardo UK > Sigma House, > > Christopher Martin Rd, > > Basildon > > SS14 3EL, UK > Tel EMC LAB : +44 (0)1268 883308 > > Mobile: +44 (0)7507 854888 > > andrew.p.pr...@leonardocompany.com > <mailto:andrew.p.pr...@leonardocompany.com> > > leonardocomapany.com > > HELICOPTERS / AERONAUTICS / ELECTRONICS, DEFENCE AND SECURITY SYSTEMS / SPACE > > > > P Please consider the environment before printing this email. > > > > > > > > > Leonardo UK Ltd > > > Registered Office: 1 Eagle Place, St James¹s, London SW1Y 6AF > > > A company registered in England & Wales. 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