TEM Consulting, LP

ANSI C63.4 - Revision

Use of Ferrite Stabilization of Exit Cables

• Future Conference Calls:
  • June 9, 2003 - 11 AM EST / 8 AM PST
  • June 19, 2003 - 11 AM EST / 8 AM PST

• Draft - Initial Findings and Current TG Position
• Proposed Revision to ANSI C63.4
  
• Issues

Issue / Action Item	Owner / Resolution Leader
Technical Specification of Ferrite Channel Specification of Impedance vs Material Characteristics If impedance is specified, variability in network analyzers at high impedances	Allen Fischer
Measurement Procedure for Channel Qualification Should cable be centered or against side of ferrite clamp?   What is the variability due to positioning? Cable routing to and away from clamp? Variation due to cable OD vs Clamp ID?	Allen Fischer
Measurement Tolerance and Uncertainty	Bob Johnk
Measurement Uncertainty of the Calibration	Werner Schaeffer
Gathering of Sufficient Data from Multiple Labs to Validate Recommendations	All
Data on Power, Data and Telecom Cables using Ferrite Channels	All
Data on Sensitivity to Variation in Cable Length to Remote Equipment	All
Ability to Use Self-Made Cables	Mike Hill
EUTs with Many Cables  Multiple Cables through a Clamp or 1 Clamp per Cable	Werner Schaeffer Completed
Physical Stability of Ferrite Magnetic Characteristics? (with rough handling, temperature, aging...?)	Henry Paris
Coordination with CISPR	Don Heirman

• WG Membership & Participants
  
• Project Background
  
• TG Documents
  • Minutes - Conference Call - April 25, 2002
  • Conference Call - May 17, 2002
  • Conference Call - May 28, 2002
    
• Documents & Contributions to the TG
  
  • Application of Ferrite Tubes to Single Cables Versus Multiple Cables (B. Harlacher - Fischer Custom Communications)
  • Calibration of Common Mode Absorption Devices (B. Harlacher - Fisher Custom Communications)
  • Technical and implementing issues with Amendment 1 of CISPR 22:1997 (G. Pettit - Intel)
  • Impedance Measurement of Absorbing Clamp (Dieter Dutschmann - Schaffner)
    
  • Impedance measurements on two samples of the absorbing clamp MDS21  (Uwe Karsten - Schaffner)
    
  • The following documents were provide by Dr. Ryser to  inform us about the ideas and the progress in the CISPR TF.  Dr. Ryser sent the latest documents from CISPR (Ref 18 to 26) as well as one of the first ones showing his own experiments illustrating the importance to define  the property of the cable terminations (Ref 02).  He gave permission for these documents to be added to this site.
    • Ref_02_TF_CT_Ryser_96-1.pdf
    • Ref_18_TF_CT_Ryser_01-03.pdf
    • Ref_19_TF_CT_Ryser_01-04.pdf
    • Ref_20_Worm.pdf
    • Ref_21_TF_CT_Ryser_02-01.pdf
    • Ref_22_TF_CT_Ryser_02-02.pdf
    • Ref_23_TF_CT_Ryser_02-03.pdf
    • Ref_24_TF_CT_Ryser_02-04.pdf
      
• Effect of Applied Stress on Ferrite Filter Impedance
  
• CISPR/I/WG3(Christchurch – Pettit)2002-01
  Problems with Amendment 1 (08/2000) to CISPR 22:1997
• CISPR/A/369/CD
  Amendment 1 to CISPR 16-2, clause 2.5: Measurements using the absorbing clamp, 30 MHz to 1000 MHz
• CISPR/A/338/CD
  Calibration of the absorbing clamp in the frequency range 30 MHz to 1000 MHz (ref CISPR 16-1, Clause 5.3 and Annex H)
  
• Cisco Investigation of Multiple Cables in Ferrite Clamp - May 13, 2002
• Photos - Cisco Ferrite Clamp Study - No Clamps
• Photos - Cisco Ferrite Clamp Study - 5 Clamps
• Photos - Cisco Ferrite Clamp Study - Far View of 5 Clamps
• Photos - Cisco Ferrite Clamp Study - 9 Clamps
• Photos - Cisco Ferrite Clamp Study - 17 Clamps
  
• Presentation - Ferrite Channel Revision - Part 1 - Ghery Pettit - April 29, 2002
• Presentation - Ferrite Channel Revision - Part 2 - Stephen Berger - April 29, 2002
  
• Ferrite Clamp vs LISN - Kunihiro Osabe
  
• Ferrite Clamp Study - Summary
• Ferrite Clamp Study
• Ferrite Clamp Study - Multiple Labs
• Ferrite Clamp Study - Comb Generator
  
• CISPR/A/WG2 ad-hoc-ferrite clamp (Mosshammer-Dunker) - January 2001
  Radiated disturbance of equipment under test with connected cables, as a function of the termination impedance
• Chamber Exit Filters for EMC Testing - R.C. Marshall
• CISPR/A/WG1 (Alexander-Nothofer-Dixon) - June 2001
  Comment on IEC 61000-4-20: The Use of Ferrite Clamps and Clip on Ferrites
• CISPR/A/WG2 (Alexander-Marshall) - June 2001
  Optimizing Radiated Testing Field Testing with Switched-Impedance Chamber (FAR) Exit Filters
  
• CISPR/A/WG2(TF CT/Ryser)01-03
  Draft CD for the validation procedure of ferrite clamps in the frequency range 30MHz to 1000MHz