© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB Revision of ANSI C Consideration of Ferrite Channel & Other Issues Stephen Berger TEM Consulting (512)

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  Current published version ANSI C  Next Revision – 2002  Restricted to unresolved comments from 2000 revision.  Initial ballot failed.  Second ballot to start May 1, 2002  3rd Revision

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  2004 Revision – Issues  Ferrite Channel  Site Validation > 1GHz  Cable loss over temperature  Harmonization with CISPR 22  Display configuration  Alternate test sites (FAR, GTEM)  Measurement uncertainty

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  Related ANSI C63 Standards  C63.2: Emission measurement instrumentation  C63.4: Emission measurements  C63.5: Antenna calibration  C63.6: Site validation error budget  C63.7: Open area test site construction  C63.22: Test automation

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  Harmonization with IEC/CISPR  CISPR 16, Part 1 (instrumentation)  CISPR 22 (measurement procedure only)

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.2 Activities  Focus on harmonization with CISPR  Requirements > 1 GHz  Determining if C63.2 should remain or adopting CISPR 16-1 where appropriate using a “USA” forward  Contact co-Chairs: Victor Kuczynski - or Herb Mertel -

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.5 Activities  C63.5: “Free space” applications  Based on horizontal polarization setup  Uses Complex Fit NSA (CFNSA) model  Latest publication includes new model to account for 50 and 200 ohm baluns for antennas in the range MHz  Work focusing now above 200 MHz  Contact Chair: Don Heirman -

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.4 – 2004 Site Validation > 1 GHz  Investigating off-bore sight antenna to antenna measurements to pick up undesired reflectors during NSA tests  Effect of non-conductive table tops on site validation  Contact Chair: Mike Windler -

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.4 – 2004 Fully Absorber Lined Rooms  Comparison with European and current IEC SC77B and CISPR/A work  Determine viability as an alternate test site to OATS  Application to ANSI C63.4 under discussion  Contact Chair: Dennis Camell -

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.4 – 2004 Ferrite Channel  Technical Specification of Ferrite Channel  Measurement Procedure for Channel Qualification  Measurement Tolerance and Uncertainty  Gathering of Sufficient Data from Multiple Labs to Validate Recommendations  Data on Power, Data and Telecom Cables using Ferrite Channels  Data on Sensitivity to Variation in Cable Length to Remote Equipment

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.4 – 2004 Specification of Ferrite Channel  Insertion loss > 15 dB (identical to CISPR 22)  Input impedance envelope  Channel I.D. to Cable O.D.?  Other specifications

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.4 – 2004 Configuration of Ferrite Channel  Cable routing, particularly at entrance to channel  Configuration of multiple exit cables  Guidance on self-made channels  Other issues that create test variability?

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.4 – 2004 Cable Routing  Current on can be the deciding factor in the amplitude of an emission  When the cables capacitance to ground is the highest impedance in a circuit loop it determines the magnitude of the current  Cable routing to the ferrite channel entry can vary the capacitance to ground and therefore the emissions by very significant quantity

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  C63.4 – 2004 Cable Routing  Capacitance  A/d  Impedance  1/f  Both the area of the cable coupled to ground and the distance to the ground plane can vary the impedance to ground by several multiples, even an order or magnitude or more!

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  Call for Involvement Information and Input is Sought  Experience using ferrites on OATS  Date on effect on emissions  Issues identified  Type of EUT  Far end configuration (simulator, network,??)  Experience > 1GHz  Response or questions to ferrite channel work

© Copyright 2002 TEM Consulting, LP - All Rights Reserved Presentation To Portland & Seattle EMCS ChaptersRev – 04/25/02 - HSB  WG URL: /groups/emc/emc/C63-4_-_revision/ansi_c63.htm  Contact Chair: Stephen Berger –