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    Acc r ed i t ed S t a nd a r d s Comm i t t ee C63

    Electromagnetic Compatibility

    Revised Draft Agenda for Meeting

    Thursday, Mar. 8, 2001, 1-5 PM

    Friday Mar. 9, 9-12 AMSouthwest Research Institute

    6220 Culebra Road, San Antonio, TX 78238

    Contact: Bill Scrivner, Tel: 210 522 2621; [email protected] 

    ----------------------------------------------------------------------------------------------------

    1.0 Call to Order

    1.1 Announcements

    1.2 Approval of agenda

    1.32 Dates of future meetings

    2.0 Consent Approval of Agenda

     2.1 Consent Agenda

    Note: Items 2.0 (actions related to the minutes) and 3.0 (Membership) on former

    meeting agenda are on the Consent Agenda . Actions taken will be reviewed by the Steering

    Committee and reported in documentation distributed in advance of the meeting or tabled at

    the meeting. They will only be discussed in detail on request.

     2.2 Balance of Agenda

     2.2.1 Change in C63 Policies and Procedures - Hoolihan

    2.2.2  Minutes of Meeting of Nov. 2, 2000 – Hall 

    3.0 C63 Standards

    3.1 C63.4-

    3.1.1 Editorial corrections

    3.1.2 Status: Interim or ANSI Standard

    3.1.2 Measurement uncertainty [AI 00-11-02, Heirman]

    3.2 C63.5 Resolution of negative ballot

    3.3 C63.8 [Annotated bibliography]: new subcommittee?

    [AI 00-11/03, Mertel]

    3.4 C63.12 Next rev. [A.I. 98 Mar-4, Hofmann]

    3.5 C63.13 Power line filters - Discussion [AI 00-11/04, all members]

    3.6 C63.15 Results of ballot [AI 00-11/10, Pritchard]

    3.7 C63.16 Resolution of copyright issue

    3.8 C63.19 Publicity [Berger]

    3.9 Meas. below 30 Mhz [AI 00-11/07, Hall, Windler, Schaefer, Lichtig, Hoffman]

    3.10 Measurements greater than 60 GHz [AI 00-11/08, Hoolihan]

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    4.0 New Topics

    4.1 C63XX Grounding [AI 00-11/06, All C63 members]

    4.2 PINS-C: Recommended Practice for On-Site Ad-Hoc Test method for Estimating

    Radiated Immunity of Electronic Devices to Specific Radio Frequency Transmitters

    4.3 Narrow Band -- Broadband Issues

    4.3.1 Testing to comply with broadband limits

    4.3.2 Are broadband limits needed? General discussion

    4.4 Other Matters

    5.0 FCC Related Matters (A. Wall)

    5.1 Incorporation of C63.4 into the Rules

    5.2 Winforum petition

    5.3 Other matters

    6.0 Subcommittee reports (please submit brief written reports based on Project Schedules)

    6.1 SC1 Meas. and Inst. (Heirman) [AI 00-11/01]

    6.2 SC2 Definitions- upgrading of C63.14

    Designations of SC representatives

    6.3 SC3 − International Standardization

    Report of meeting, 03/05

    6.4 SC6 Laboratory Accreditation (D. Hoolihan)

    6.5 SC7 Personal Communications Services (A. Light)

    6.6 SC8 Medical Equipment Testing (D. Hoolihan)6.7 Pins for C63.8 - Mertel

    7.0 Other Business

    7.1 Status of adoption of international standards (Mertel)

    Republication of IEC 61000-4-2 to 11 [AI 00-11/13, Pritchard]

    7.2 Future Seminars (Heirman)

    7.3 Workshops (Heirman)

    7.4 Liaison (Doug Smith)

    7.5 Review of C63 SC Memberships – Chairs

    7.6 Submittal of comments on C63 ballots- Schaefer

    7.7 Proposal for Project on Measurements below 30 MHz – Light

    7.8 Review of C63 Membership – Pritchard

    7.9 Old Action Item 00-11/18 – Hoolihan

    7.10 New C63 Member – Hoolihan

    7.11 Old Action Item 00-11/16 – Pritchard 

    8.0 Newsletter - Comments and proposals

    9.0 AdjournmentAtt. 3 – Revised Agenda 

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    DRAFT #2

    CHANGE TO C63 PROCEDURES

    Current wording in the procedures

    A.6 Subgroups created by the committeeWhen one or more subgroups (subcommittees, working groups, technical subcommittees, writing

    groups, etc.) are formed to expedite the work of the consensus body, their formation (and later

    disbandment) requires approval by a majority vote of the consensus body and appropriate public

    notice. The scope and duties delegated to the subgroup shall be approved at the time it is formed,

    and subsequent changes in scope or duties shall also require approval by the consensus body. The

    charge to the subgroup shall clearly state whether:

    a. The subgroup is responsible for the definitive content of one or more standards and forresponding to views and objections thereon. Such subgroups shall maintain a

    membership roster in accordance with A.5.5(a) through A.5.5(g) and shallcomply with the provisions in A.5.4, A.7.1, and Clause A.8 as applied to voting on thestandard(s);

    or

     b. The subgroup is responsible for assisting the consensus body (e.g. drafting all or a portion of a standard, drafting responses to comments, drafting positions on

    international standards, or other purely advisory functions).

    A.6.1 Chairperson and members of subgroupsThe chair and members of a subgroup shall be appointed by the chair of the consensus body andconfirmed by the consensus body. The scope, duties, and membership of all subgroups shall bereviewed by the consensus body annually. The officers and members of a subgroup need not bemembers of the consensus body.

    A.6.2 Approval of standardsDraft standards and any substantive change (see Clause 1.2.9 of the ANSI Procedures) in thecontent of a standard proposed by a subgroup shall be referred to the consensus body forapproval.

    Proposed Changes to the Procedure

    A.6 Subcommittees created by the committeeWhen one or more subcommittees are formed to expedite the work of the consensus body, theirformation (and later disbandment) requires approval by a majority vote of the consensus body andappropriate public notice. The scope and duties delegated to the subcommittee shall be approvedat the time it is formed, and subsequent changes in scope or duties shall also require approval bythe consensus body. The charge to the subcommittee shall clearly state whether:

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     a. The subcommittee is responsible for the definitive content of one or more standards

    and for responding to views and objections thereon. Such subcommittees shall maintain amembership roster in accordance with A.5.5(a) through A.5.5(g) and shall

    comply with the provisions in A.5.4, A.7.1, and Clause A.8 as applied to voting on thestandard(s);

    or

     b. The subcommittee is responsible for assisting the consensus body (e.g. drafting all or a portion of a standard, drafting responses to comments, drafting positions on

    international standards, or other purely advisory functions).

    A.6.1 Chairperson and members of subcommitteesThe chair and members of a subcommittee shall be appointed by the chair of the consensus bodyand confirmed by the consensus body. The scope, duties, and membership of all subcommitteesshall be reviewed by the consensus body annually. The officers and members of a subcommitteeneed not be members of the consensus body.

     A6.1.1 - Working Groups and Task Forces formed under Subcommittees will be

     formed by the Subcommittee chairs and be approved by a vote by the Subcommittee.

    The chairman of the Working Group or Task Force will be appointed by the chairmanof the Subcommittee. Membership of the Working Group or Task Force will be open

    (members need not be members of the consensus body) and be approved by the

    Subcommittee; their mission and timetable will also be approved by theSubcommittee.

    The membership of the Working Group or Task Force shall be reported to theConsensus Body for informational purposes only.

    A.6.2 Approval of standardsDraft standards and any substantive change (see Clause 1.2.9 of the ANSI Procedures) in thecontent of a standard proposed by a subcommittee shall be referred to the consensus body forapproval.

    A6.2.1- Draft standards and any substantive change (see Clause 1.2.9 of the ANSI

    Procedures) in the content of a standard proposed by a Working Group or Task Force shal l be

    referred to the subcommi ttee for r eview befor e submi ttal to the consensus body for approval.

    The submi ttal to the consensus body shal l be based on a major ity vote of the responsible

    subcommittee.

    February, 2001

    Att. 4 – Revision to C63 Procedures

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    Date: March 8, 2001 _________

    ANSI Project Ini tiation Notif ication System (PINS) Form (Rev. 7/99 )This form may be faxed to 212-730-1346 or sent via E-mail to [email protected]  or [email protected]  

    1. Name of Accredited Standards Developer (include acronym if applicable): ANSI ASC 63 (EMC)

    2. Method and Date of Accreditation: ____________________________

    Operating procedures (check one) [XX__] Have [__] Have Not been revised since that date

    These revisions (check one) [_XX_] Have [__] Have Not been submitted to ANSI for

    review.

    3. Designation of Project: ANSI C63.X

    4. Title of Project: Recommended Practice for On-Site ad-hoc Test Method for Estimating Radiated

    Electromagnetic Immunity of Electronic Devices to Specific Radio -Frequency Transmitters

    5. Scope Summary or Abstract of Project∇ : Requests have been made for testing of electromagnetic

    compatibility between hand-held wireless transmitters (cell phones and radios) and electronic devices

    used in manufacturing and industry. The size and limited availability of these devices often make

    testing under controlled laboratory conditions unrealistic, and therefore an on-site and ad hoc test

     protocol, similar to that drafted for medical-specific devices, is proposed

    6. Check here if the standard covers a consumer product or service: [ ]

    7. DEVELOPER MUST BE REGISTERED FORMALLY TO USE THIS OPTION: Check here if this

    standard will be maintained using the Continuous Maintenance Option in accordance with clause 4.4.2

    of the ANSI Procedures: [_]

    8. Canvass developers: check here if you are also requesting the publication of an initiation of canvass

    announcement: [__]

    9. Units of measurement used in the standard (check one):

    [X] International System of Units (SI) [__] Inch/Pound [__] Both [__] Other [__] Not MeasurementSensitive

    9. Additional Keywords (not contained in title or scope summary/abstract)

    Radio transmitters, Cellular telephones

    11. Project Intent ( relates to the status of the standard in terms of ANSI only,

    e.g., any standard that is not an approved ANS, is a new standard):

    Supersedes: (relates to the currently app

    ANSI standard(s):

     _X_Create a new American National Standard (ANS) None

    12. a. Expected Initiation of Project Development: July 2001 __________________________________

     b. Expected Completion of Project (i.e., submittal of BSR-8): October 2001 _______________________

    13. Contact (Staff person responsible for this technical area):

     Name: ___________________________________ Title: __________________________________

    Affiliation: _______________________________

    Att. 5 – PINS for Recommended Practice for On-Site Ad-Hoc Test method for Estimating Radiated

    Immunity of Electronic Devices to Specific Radio Frequency Transmitters

    ∇ Attach separate sheet if necessary. 

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    Date: March 8, 2001 ______

    ANSI Project Ini tiation Notifi cation System (PINS) Form (Rev. 7/99)This form may be faxed to 212-730-1346 or sent via E-mail to [email protected]  or [email protected]  

    1. Name of Accredited Standards Developer (include acronym if applicable): ANSI ASC 63 (EMC)

    2. Method and Date of Accreditation: ____________________________

    Operating procedures (check one) [XX__] Have [__] Have Not been revised since that date

    These revisions (check one) [__] Have [_XX_] Have Not been submitted to ANSI for

    review.

    3. Designation of Project: ANSI C63.2

    Title of Project: American National Standard for Measurement Instrumentation

    Scope Summary or Abstract of Project∇ :

    This project will revise C63.2 into two parts:a. Provide for a basic document replicating or referencing as appropriate measurement receiver

    specifications in CISPR 16-1:1999.

     b. Provide a US foreward which will include those aspects of C63.2 not covered in CISPR 16 -1

    which has applicability to US requirements

    Check here if the standard covers a consumer product or service: [X]

    1. DEVELOPER MUST BE REGISTERED FORMALLY TO USE THIS OPTION: Check here if this

    standard will be maintained using the Continuous Maintenance Option in accordance with clause 4.4.2

    of the ANSI Procedures: [_XX]

    2. Canvass developers: check here if you are also requesting the publication of an initiation of canvass

    announcement: [__]

    3. Units of measurement used in the standard (check one):[X] International System of Units (SI) [__] Inch/Pound [__] Both [__] Other [__] Not Measurement

    Sensitive

    4. Additional Keywords (not contained in title or scope summary/abstract)

    Receivers, spectrum analyzers, detectors, bandwidth, immunity

    11. Project Intent ( relates to the status of the standard in terms of ANSI only,

    e.g., any standard that is not an approved ANS, is a new standard):

    Supersedes: (relates to the currently app

    ANSI standard(s):

    X_Revise current ANS: ANSI C63.2

    12. a. Expected Initiation of Project Development: April 2001__________________________________

     b. Expected Completion of Project (i.e., submittal of BSR-8): December 2001 ______________________

    13. Contact (Staff person responsible for this technical area):

     Name: ___________________________________ Title: __________________________________

    Affiliation: __________________________________________________________________________Address:_____________________________________________________________________________

    City: _________________________________________ State: _____________Zip: ____________Telephone: ______________________ , ext ___________ Fax: ______________________________

    E-mail: Signature:

    Att. 6 – PINS for Addition of a spectrum analyzer in a Revision of C63.2

    ∇ Attach separate sheet if necessary. 

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    Date: March 8, 2001 _________

    ANSI Project Ini tiation Noti f ication System (PINS) Form (Rev. 7/99 )This form may be faxed to 212-730-1346 or sent via E-mail to [email protected]  or [email protected]  

    10. Name of Accredited Standards Developer (include acronym if applicable): ANSI ASC 63 (EMC)

    11. Method and Date of Accreditation: ____________________________

    Operating procedures (check one) [XX__] Have [__] Have Not been revised since that date

    These revisions (check one) [__] Have [_XX_] Have Not been submitted to ANSI for

    review.

    12. Designation of Project: ANSI C63.X

    13. Title of Project: American National Standard for Methods of Measurement of emissions and immunity

    using reverberation chamber techniques

    14. Scope Summary or Abstract of Project∇ : This project proposes a new document on the use of the

    reverberation chambers and method of measurements including emissions, immunity, shielding, and

    other applications. The application to specific electronic devices will be addressed. In addition the

    work will address for radiated emission testing the correlation between measured power in a

    reverberation chamber and the resultant prediction of field strength at a distance over a conducting

    ground plane

    15. Check here if the standard covers a consumer product or service: [X]

    16. DEVELOPER MUST BE REGISTERED FORMALLY TO USE THIS OPTION: Check here if this

    standard will be maintained using the Continuous Maintenance Option in accordance with clause 4.4.2

    of the ANSI Procedures: [_XX]

    17. Canvass developers: check here if you are also requesting the publication of an initiation of canvass

    announcement: [__]

    18. Units of measurement used in the standard (check one):

    [X] International System of Units (SI) [__] Inch/Pound [__] Both [__] Other [__] Not MeasurementSensitive

    9. Additional Keywords (not contained in title or scope summary/abstract)

    Statistical, mode-stirred, mode-tuned,

    11. Project Intent ( relates to the status of the standard in terms of ANSI only,

    e.g., any standard that is not an approved ANS, is a new standard):

    Supersedes: (relates to the currently app

    ANSI standard(s):

     _X_Create a new American National Standard (ANS) None

    14. a. Expected Initiation of Project Development: April 2001__________________________________

     b. Expected Completion of Project (i.e., submittal of BSR-8): April 2003 __________________________

    15. Contact (Staff person responsible for this technical area):

     Name: ___________________________________ Title: __________________________________

    Affiliation: __________________________________________________________________________

    Att. 7 – PINS for methods of measuring emissions and immunity using reverberation-chamber

    techniques.

    ∇ Attach separate sheet if necessary. 

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      Date: March 8, 2001 ______

    ANSI Project Initi ation Notif ication System (PINS) Form (Rev. 7/99)This form may be faxed to 212-730-1346 or sent via E-mail to [email protected]  or [email protected]  

    1. Name of Accredited Standards Developer (include acronym if applicable): ANSI ASC 63 (EMC)

    2. Method and Date of Accreditation: ____________________________Operating procedures (check one) [XX__] Have [__] Have Not been revised since that date

    These revisions (check one) [__] Have [_XX_] Have Not been submitted to ANSI for

    review.

    3. Designation of Project: ANSI C63.4-2000 Revision

    Title of Project: American National Standard for Methods of Measurement of Radio -Noise Emissions from

    Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz

    4. Scope Summary or Abstract of Project∇ : This project proposes to revise ANSI C63.4. This revision

    is to be limited to comments received but not included during the revision of the 2000 version of ANSI

    C63.4. The comments will be reviewed, resolved and incorporated, as appropriate.

    5. Check here if the standard covers a consumer product or service: [X]

    6. DEVELOPER MUST BE REGISTERED FORMALLY TO USE THIS OPTION: Check here if this

    standard will be maintained using the Continuous Maintenance Option in accordance with clause 4.4.2

    of the ANSI Procedures: [_XX]

    7. Canvass developers: check here if you are also requesting the publication of an initiation of canvass

    announcement: [__]

    8. Units of measurement used in the standard (check one):

    [X] International System of Units (SI) [__] Inch/Pound [__] Both [__] Other [__] Not Measurement

    Sensitive

    9. Additional Keywords (not contained in title or scope summary/abstract)

    conducted emissions testing, conducting ground plane, digital equipment, electric field measurement,

    line impedance stabilization network, low-voltage electrical equipment, low-voltage electronicequipment, magnetic field measurement, normalized site attenuation, radiated emission testing, radio-

    noise emissions, radio-noise power, site attenuation, unintentional radiators

    11. Project Intent ( relates to the status of the standard in terms of ANSI only,

    e.g., any standard that is not an approved ANS, is a new standard):

    Supersedes: (relates to the currently app

    ANSI standard(s):

    X_Revise current ANS: ANSI C63.4-2000

    12. a. Expected Initiation of Project Development: April 2001__________________________________

     b. Expected Completion of Project (i.e., submittal of BSR-8): April 2002 __________________________

    13. Contact (Staff person responsible for this technical area):

     Name: ___________________________________ Title: __________________________________

    Affiliation: __________________________________________________________________________Address:_____________________________________________________________________________

    City: _________________________________________ State: _____________Zip: ____________Telephone: ______________________ , ext ___________ Fax: ______________________________

    E-mail: Signature:

    Att. 8 – PINS for Revision of C63.4

    ∇ Attach separate sheet if necessary. 

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    `` Accredited Standards Committee C63 Electromagnetic Compatibi li tyAccredited by the American National Standards Institute, Inc.

    Secretariat: Institute of Electrical and Electronics Engineers, Inc.

    Chair: Dr. Ralph M. Showers; 215 898 8123 Vice Chair: Edwin

    L. Bronaugh; 512 258 6687

    Staff Liaison: Patricia Gerdon: 732-562-3811, Fax: 732. 562. 1571

    PINS-C FORM(Project Initiation Notification System-Committee Level)

    To: Dan Hoolihan From: Michael W. Howard

    Date: March 7, 2001

    Designation of Project (ie C63.XX ask Tricia for number if it's a new project):

    ..C63.XX..........................................................................................................................................................

    Title of Project:

    Checklists and guidance for Assessors in the Assessment of Calibration Laboratories for EMC related

    equipment and antennas.

    Scope Summary:

    This project will define a set of minimum guidance for assessors involved in the assessment of calibration

    laboratories providing calibration services for EMC test labs. The results of this project would be a

    checklist that would include a appropriate list of reference material (reference to applicable calibration

    standards, accepted methods for determining Measurement Uncertainty and list major contributors of Muc

    for Calibration) for the assessors use in the assessment of the calibration laboratory. The checklist will also

    include a set of minimum items that the assessor will n eed to evaluate the technical competence of the lab.

    Keywords:

    Calibration Standards, Measurement Uncertainty, Checklists, Assessor References

    Intent: NEW  

    Project Schedule: Expected initiation date: March 7, 2001 and completion date: July, 2002

    Committee Contact person for this project: Name: Michael W. Howard

    Company: Liberty Labs, Inc.

    Address: P.O. Box 230, 1346 Yellowwood Rd., Kimballton, IA 51543

    Voice: 712-773-2199 Fax: 712-773-2299

    Email: [email protected] 

    Chair Use Only:

    Att. 9 – PINS for “Checklists and guidance for Assessors in the Assessment of Calibration

    Laboratories for EMC related equipment and antennas”.

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    Date: MARCH 6, 2001

    ANSI Project Ini tiation Notif ication System (PINS) Form (Rev. 7/99)This form may be faxed to 212-730-1346 or sent via E-mail to [email protected]  or [email protected]  

    1. Name of Accredited Standards Developer (include acronym if applicable):

    Accredited Standards Committee, C63 on Electromagnetic Compatibility (EMC) 

    2. Method and Date of Accreditation: ASC - August 1, 1985 

    Operating procedures (check one) [X] Have   [__] Have Not  been revised since that date

    These revisions (check one) [X] Have   [__] Have Not  been submitted to ANSI forreview.

    3. Designation of Project: C63.8 

    4. Title of Project: Prepare a reference document "Annotated Compendium of Electromagnetic

    Compatibility (EMC) Standards Throughout the World". It will be a summary of EMC

    standards in use throughout the World. 

    5. Scope Summary or Abstract of Project

     : Prepare the document from the DoD Project Number:0178 " "Comparisons of EMC Requirements of Major International EMC Standards" Annex B2

    . The format will be: 1-Introduction, 2-Environmental Standards, 3-Basic Standards, 4-Generic

    Standards, Product Standards, 6-Communication Related Standards, 7 -System Standards, 8-

    Lightning,EMP, ESD Standards, 9- Installation Standards  

    6. Check here if the standard covers a consumer product or service: [X] 7. DEVELOPER MUST BE REGISTERED FORMALLY TO USE THIS OPTION: Check here if this

    standard will be maintained using the Continuous Maintenance Option in accordance with clause 4.4.2

    of the ANSI Procedures: [ ]

    8. Canvass developers: check here if you are also requesting the publication of an initiation of canvass

    announcement: [__]

    9. Units of measurement used in the standard (check one):

    [] International System of Units (SI) [  ] Inch/Pound [ X _] Both [__] Other [__] Not MeasurementSensitive

    10. Additional Keywords (not contained in title or scope summary/abstract): Electromagnetic

    Compatibility 

    11. Project Intent ( relates to the status of the standard in terms of ANSI only,e.g., any standard that is not an approved ANS, is a new standard):

    Supersedes: (relates to the currently appANSI standard(s):

    [X] Prepare a New ANS: C63.8 First Edition  New Standard

    12. a. Expected Initiation of Project Development: March 10,2001 _____________________________

     b. Expected Completion of Project (i.e., submittal of BSR-8): August 1, 2003 ______________________

    13. Contact (Staff person responsible for this technical area):

     Name: R. L. Pritchard ___________________ Title: Secretary. ASC C63  _________________

    Att. 11 – PINS for Compendium of EMC Standards, Project C63.8 

    ∇ Attach separate sheet if necessary. 

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    Accredited Standards Committee C63 - Electromagnetic Compatibil ity

    Accredited by the American National Standards Institute, Inc.

    Secretariat: Institute of Electrical and Electronics Engineers, Inc.

    Chair Vice Chair Secretary

    Dr. Ralph M. Showers Edwin l. Bronaugh Rosemary Tennis

    215 898 8123 512 258 6687 732 562 3811

    PINS-C FORM

    (Project Initiation Notification System-Committee Level)

    To:_Dr. R. M. Showers, Chair_________From:__A. H. Light _Date:_8 March 2001

    Designation of Project (ie C63.XX)

     N/A

    Title of Project:

    Measurement of Magnetic Waves at Frequencies Below 30 M Hz

    Scope Summary:

    The purpose of this effort is to develop procedures for the measurement of magnetic fields at frequencies

     below 30 MHz. As appropriate this effort will either develop a procedure to be included in ANSI C63.4

    clause 4 with the necessary appendices to describe the modified procedures necessary to perform these

    measurements or develop a new ANSI C63 standard for this purpose and to be referenced in ANSI C63.4

    clause 4. This effort will consider the use of the Van Veen loop in accordance with CISPR 16-1 and –2

    for devices of less than 1.6 m on its largest dimension. For devices larger 1.6 m, the effort will develop a

    near-field procedure which can be used to determine the actual magnetic field intensity which would

    actually be observed at the required measurement distance by the FCC or other relevant authority.

    Keywords:Magnetic Fields

    Van Veen Loops

    < 30 MHz

    Intent: X New O Revised O Reaffirm O Withdraw O Adopt O Discontinue

    Expected initiation date:__9 March 2001________and completion date__8 March 2002____of this project.

    Committee Contact person for this project:

     Name: Arthur H. Light

    Company: ITT Industries

    Address: 1560 Huntington Avenue

    Alexandria, VA 22303-1404

    Voice: 703-329-3879 Fax: 703-960-0643 Email: [email protected]

     

    Att. 13 –PINS-C for project on Measurements below 30 MHz