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    TIA TSB-92-A-2009 Report on EME Evaluation for RF Cabinet Emissions Under FCC MPE Guidelines《FCC MPE规定的射频(RF)内阁排放量的EME评估报告》.pdf

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    TIA TSB-92-A-2009 Report on EME Evaluation for RF Cabinet Emissions Under FCC MPE Guidelines《FCC MPE规定的射频(RF)内阁排放量的EME评估报告》.pdf

    1、 TSB-92-A June 2009 Report on EME Evaluation for RF Cabinet Emissions Under FCC MPE Guidelines NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and i

    2、mprovement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for their particular need. The existence of such Standards and Publications shall not in any respect preclude any member or non-member of TIA from manufacturing or selling products no

    3、t conforming to such Standards and Publications. Neither shall the existence of such Standards and Publications preclude their voluntary use by Non-TIA members, either domestically or internationally. Standards and Publications are adopted by TIA in accordance with the American National Standards In

    4、stitute (ANSI) patent policy. By such action, TIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. This Standard does not purport to address all safety problems associated with its use or all applicable reg

    5、ulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. 3-0338-RV1, formulated under the cognizance of the TIA, TR-8 Mobi

    6、le and Personal Private Radio Standards. TR-8.17 Subcommittee onRF Exposure). Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current Catalog of TIA TELECOMMUNICATIONS INDUSTRY ASSOCIATIO

    7、N STANDARDS AND ENGINEERING PUBLICATIONS or call IHS USA and Canada (1-800-525-7052 ) International (303-790-0600) or search online at http:/www.tiaonline.org/standards/catalog/ All rights reserved Printed in U.S.A. NOTICE OF COPYRIGHT This document is copyrighted by the TIA. Reproduction of these d

    8、ocuments either in hard copy or soft copy (including posting on the web) is prohibited without copyright permission. For copyright permission to reproduce portions of this document, please contact TIA Standards Department or go to the TIA website (www.tiaonline.org) for details on how to request per

    9、mission. Details are located at: http:/www.tiaonline.org/standards/catalog/info.cfm#copyright OR Telecommunications Industry Association Standards (b) there is no assurance that the Document will be approved by any Committee of TIA or any other body in its present or any other form; (c) the Document

    10、 may be amended, modified or changed in the standards development or any editing process. The use or practice of contents of this Document may involve the use of intellectual property rights (“IPR”), including pending or issued patents, or copyrights, owned by one or more parties. TIA makes no searc

    11、h or investigation for IPR. When IPR consisting of patents and published pending patent applications are claimed and called to TIAs attention, a statement from the holder thereof is requested, all in accordance with the Manual. TIA takes no position with reference to, and disclaims any obligation to

    12、 investigate or inquire into, the scope or validity of any claims of IPR. TIA will neither be a party to discussions of any licensing terms or conditions, which are instead left to the parties involved, nor will TIA opine or judge whether proposed licensing terms or conditions are reasonable or non-

    13、discriminatory. TIA does not warrant or represent that procedures or practices suggested or provided in the Manual have been complied with as respects the Document or its contents. If the Document contains one or more Normative References to a document published by another organization (“other SSO”)

    14、 engaged in the formulation, development or publication of standards (whether designated as a standard, specification, recommendation or otherwise), whether such reference consists of mandatory, alternate or optional elements (as defined in the TIA Engineering Manual, 4thedition) then (i) TIA discla

    15、ims any duty or obligation to search or investigate the records of any other SSO for IPR or letters of assurance relating to any such Normative Reference; (ii) TIAs policy of encouragement of voluntary disclosure (see Engineering Manual Section 6.5.1) of Essential Patent(s) and published pending pat

    16、ent applications shall apply; and (iii) Information as to claims of IPR in the records or publications of the other SSO shall not constitute identification to TIA of a claim of Essential Patent(s) or published pending patent applications. TIA does not enforce or monitor compliance with the contents

    17、of the Document. TIA does not certify, inspect, test or otherwise investigate products, designs or services or any claims of compliance with the contents of the Document. ALL WARRANTIES, EXPRESS OR IMPLIED, ARE DISCLAIMED, INCLUDING WITHOUT LIMITATION, ANY AND ALL WARRANTIES CONCERNING THE ACCURACY

    18、OF THE CONTENTS, ITS FITNESS OR APPROPRIATENESS FOR A PARTICULAR PURPOSE OR USE, ITS MERCHANTABILITY AND ITS NONINFRINGEMENT OF ANY THIRD PARTYS INTELLECTUAL PROPERTY RIGHTS. TIA EXPRESSLY DISCLAIMS ANY AND ALL RESPONSIBILITIES FOR THE ACCURACY OF THE CONTENTS AND MAKES NO REPRESENTATIONS OR WARRANT

    19、IES REGARDING THE CONTENTS COMPLIANCE WITH ANY APPLICABLE STATUTE, RULE OR REGULATION, OR THE SAFETY OR HEALTH EFFECTS OF THE CONTENTS OR ANY PRODUCT OR SERVICE REFERRED TO IN THE DOCUMENT OR PRODUCED OR RENDERED TO COMPLY WITH THE CONTENTS. TIA SHALL NOT BE LIABLE FOR ANY AND ALL DAMAGES, DIRECT OR

    20、 INDIRECT, ARISING FROM OR RELATING TO ANY USE OF THE CONTENTS CONTAINED HEREIN, INCLUDING WITHOUT LIMITATION ANY AND ALL INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT,

    21、BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS

    22、. TSB-92-A ii THIS PAGE INTENTIONALLY LEFT BLANK TSB-92-A iii TABLE OF CONTENTS 1. INTRODUCTION 1 1.1. SCOPE. 1 2. REFERENCES. 1 3. FCC ELECTROMAGNETIC EMISSION LIMITS. 1 4. LIMIT CASE ANALYSIS 3 4.1. CALCULATION OF EME LEVEL BASED ON THE FCC LIMIT OF -13 DBM FOR EACH OF THE TRANSMITTER HARMONICS (1

    23、-10) 3 4.2. EXAMPLE SPREADSHEET CALCULATIONS 3 4.3. CALCULATIONS AT REPRESENTATIVE FREQUENCIES 3 MHZ 2 GHZ. 4 4.4. MEASUREMENT METHOD. 5 5. TRANSMITTER SITE CONSIDERATIONS. 5 5.1. SITE COMPLIANCE 5 6. SUMMARY. 6 ANNEX A A-1 ANNEX B B-1 DOCUMENT REVISION HISTORY Version Date Description TSB-92 July 1

    24、998 Initial release TSB-92A October 2008 Removed references to vehicular application and updated document style. TSB-92-A iv FOREWORD This foreward is not part of this Telecommunications Systems Bulletin (TSB) This TSB is the product of work undertaken by the Electromagnetic Energy (EME) working gro

    25、up of the TIA TR8.17 RF Exposure subcommittee. The subcommittee addresses Radio Frequency Exposure matters. TR8.17 is a subcommittee of TIA TR8 Mobile and Personal Private Radio Standards Engineering Committee. This TSB was revised and approved for publication at the October 16, 2008 meeting of TR8.

    26、17. The motion to publish was ratified at the January 22, 2009 meeting of TR8.17. There are two annexes, Annex A and Annex B, in this TSB and both are informative. TSB-92-A v Patent Identification The readers attention is called to the possibility that using this document might necessitate the use o

    27、f one or more inventions covered by patent rights. By publication of this document no position is taken with respect to the validity of those claims or any patent rights in connection therewith. The patent holders so far identified have, we believe, filed statements of willingness to grant licenses

    28、under those rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such licenses. The following patent holders and patents have been identified in accordance with the TIA intellectual property rights policy: None identified TIA is not be responsible for iden

    29、tifying patents for which licenses might be referenced by this document or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. TSB-92-A vi THIS PAGE INTENTIONALLY LEFT BLANK TSB-92-A 1 1. Introduction 1.1. Scope This TSB establishes and docum

    30、ents methods and procedures of evaluation to establish compliance of fixed station cabinet emission levels with respect to the Federal Communications Commission (FCC) electromagnetic exposure (EME) limits. Specifically the EME characterization is of box level equipment only, e.g., a fixed station, c

    31、ontrol station, or similar equipment. This TSB is not a substitute for a complete transmitter site environmental assessment (EA) by means of computational methods or site measurement or a combination of these two means. A limit case analysis based on the 47 CFR part 90 certification requirements for

    32、 spurious emissions limits included herein shows that certified equipment at the box level is within the FCC maximum permissible exposure (MPE) limits. 2. References This Telecommunications System Bulletin contains only informative information. There are references to TIA standards which contain nor

    33、mative elements. These references are primarily to indicate the methods of measurement contained in those documents. At the time of publication, the edition indications were valid. All standards and bulletins are subject to revision, and parties to agreements based on this document are encouraged to

    34、 investigate the possibility of applying the most recent edition of the standard or bulletin indicated in Section 3. ANSI and TIA maintain registers of currently valid national standards published by them. There are references to FCC rules. The Federal Code of Regulations (CFR) is subject to revisio

    35、n. The Government Printing Office (GPO) maintains a listing of the latest published titles. 3. FCC Electromagnetic Emission Limits Controlled and general population RF Exposure Limits are shown in Table 1, below. The RF Exposure Limits shown in Table 1 are the limits adopted by the FCC. The RF expos

    36、ure limits adopted by the FCC are generally based on recommendations from the National Council on Radiation Protection and Measurements (NCRP) Report No. 86 and the American National Standards Institute (ANSI/IEEE) C95.1-1992.11NCRP Report No. 86, “Biological Effects and Exposure Criteria for Radiof

    37、requency Electromagnetic Fields“, sections 17.4.1, 17.4.1.1, 17.4.2 and 17.4.3; copyright NCRP, 1986, Bethesda, Maryland 20814. ANSI/IEEE C95.1-1992, “IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz”, Section 4.1; copyright 1

    38、992 by the Institute of Electrical and Electronics Engineers, Inc., New York, New York 10017. TSB-92-A 2 Table 1 MAXIMUM PERMISSIBLE EXPOSURE (MPE) LIMITS2(A) Limits for Occupational/Controlled Exposure Frequency Electric Field Magnetic Field Power Density Averaging Time Range Strength (E) Strength

    39、(H) (S) (MHz) (V/m) (A/m) (mW/sq. cm) (minutes) 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842/f 4.89/f (900/f2)* 6 30-300 61.4 0.163 1.0 6 300-1500 - - f/300 6 1500-100,000 - - 5 6 (B) Limits for General Population/Uncontrolled Exposure Frequency Electric Field Magnetic Field Power Density Averaging Time Ra

    40、nge Strength (E) Strength (H) (S) (MHz) (V/m) (A/m) (mW/sq. cm) (minutes) 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f2)* 30 30-300 27.5 0.073 0.2 30 300-1500 - - f/1500 30 1500-100,000 - - 1.0 30 f = frequency in MHz *Plane-wave equivalent power density 2See 47 CFR 1.1310. TSB-92-A 3 4.

    41、Limit Case Analysis This analysis is structured to show that equipment that conforms to FCC emission limits for the carrier and its harmonics, through the tenth, will result in an equipment level EME that is compliant to the MPE limits as set forth in 47 CFR 1.1310. 4.1. Calculation of EME level bas

    42、ed on the FCC limit of -13 dBm for each of the transmitter harmonics (1-10). The limit case calculation will compute the resultant EME level, as a percent of the MPE level, of a transmitter that exhibits the maximum allowable cabinet emission limits as defined in 47 CFR 90.210. This maximum level is

    43、 a spurious emission that is attenuated by at least 43 + 10 log(P) dB, with P being the transmitter average power in watts or equivalently -13 dBm. The cabinet emissions are considered to be emitted from a point source. As such it is necessary to define a distance at which the power density will be

    44、calculated. A distance of 20 cm is used based on the ANSI/IEEE C95.3-2002 “Recommended Practice for the Measurement of Potentially Hazardous Electromagnetic Fields RF and Microwave” recommendation of a minimum separation distance of 20 cm between the probe and the perturbing object. This will allow

    45、controlled population to be sufficiently close to the equipment to allow direct observation or normal service interface through a terminal device or similar equipment. 4.2. Example spreadsheet calculations Calculation method: 1. Compute the power density, S, using equation 1, for each harmonic at th

    46、e maximum allowable FCC radiated level (-13 dBm), at the specified distance, 20 cm, for the horizontal polarization, “where Prad is the power radiated”. S = (Pradx 1.64)/( x r2) mW/cm2, r=20 cm (1) Pradis the radiated power (mW) r is the minimum working distance (cm) 2. Compute percent of MPE for ea

    47、ch harmonic using equation 2. %MPE(fn) = 100 x S(fn)/MPE(fn) (2) MPE(fn) is the allowable MPE for each transmitter harmonic , n = 1 to 10; S(fn) is the power density for each transmitter harmonic, n = 1 to 10; TSB-92-A 4 3. %MPE(h) = Sum of %MPE(fn), n = 1-10. %MPE(h) is the percent of the maximum p

    48、ermissible exposure in the horizontal polarization 4. Repeat steps 1-3 for vertical polarization. 5. Total %MPE = %MPE(h) + %MPE(v) 4.3. Calculations at representative frequencies 3 MHz 2 GHz Tables showing the complete set of calculations (horizontal and vertical polarization) for each frequency an

    49、d its harmonics are included in Annex A. Table 2 below shows the highest level computed for each of the various Fundamental Frequencies shown in Annex A. Table 1 Maximum Resultant Controlled and General Population Percentage of FCC MPE limits for each Fundamental Frequency shown in Annex A Fundamental Frequency (MHz) Controlled Population % MPE General Population % MPE 3 1.26E-02 6.30E-02 30 3.27E-02 1.64E-01 450 8.58E-03 4.29E-02 900 6.98E-03 3.49E-02 1900 6.54E-03 3.27E-02 The highest (worst case) computed level, as shown in Table 2, above at a Fundamental F


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