HAC Report 3

FCC ID: AEZSCP-56H

Test Report

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15.      CONCLUSION

The measurements indicate that the wireless communications device complies with the HAC limits
specified in accordance with the ANSI PC63.19 Standard and FCC WT Docket No. 01-309 RM -8658.
Precise laboratory measures were taken to assure repeatability of the tests. The tested device complies
with the requirements in respect to all parameters specific to the test. The test results and statements
relate only to the item(s) tested.

Please note that the M-rating for this equipment only represents the field interference possible against a
hypothetical and typical hearing aid. The measurement system and techniques presented in this
evaluation are proposed in the ANSI standard as a means of best approximating wireless device
compatibility with a hearing-aid. The literature is under continual re-construction.




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16.      REFERENCES

    1.   ANSI PC63.19-2005 D3.6, American National Standard for Methods of Measurement of
         Compatibility between Wireless communication devices and Hearing Aids.”, New York, NY, IEEE,
         April 2005.

    2.   Berger, H. S., “Compatibility Between Hearing Aids and Wireless Devices,” Electronic Industries
         Forum, Boston, MA, May, 1997

    3.   Berger, H. S., “Hearing Aid and Cellular Phone Compatibility: Working Toward Solutions,”
         Wireless Telephones and Hearing Aids: New Challenges for Audiology, Gallaudet University,
         Washington, D.C., May, 1997 (To be reprinted in the American Journal of Audiology).

    4.   Berger, H. S., “Hearing Aid Compatibility with Wireless Communications Devices, “ IEEE
         International Symposium on Electromagnetic Compatibility, Austin, TX, August, 1997.

    5.   Bronaugh, E. L., “Simplifying EMI Immunity (Susceptibility) Tests in TEM Cells,” in the 1990 IEEE
         International Symposium on Electromagnetic Compatibility Symposium Record, Washington,
         D.C., August 1990, pp. 488-491

    6.   Byme, D. and Dillon, H., The National Acoustics Laboratory (NAL) New Procedure for Selecting
         the Gain and Frequency Response of a Hearing Aid, Ear and Hearing 7:257-265, 1986.

    7.   Crawford, M. L., “Measurement of Electromagnetic Radiation from Electronic Equipment using
         TEM Transmission Cells, “ U.S. Department of Commerce, National Bureau of Standards, NBSIR
         73-306, Feb. 1973.

    8.   Crawford, M. L., and Workman, J. L., “Using a TEM Cell for EMC Measurements of Electronic
         Equipment,” U.S. Department of Commerce, National Bureau of Standards. Technical Note 1013,
         July 1981.
                                                                            st
    9.   EHIMA GSM Project, Development phase, Project Report (1 part) Revision A. Technical-
         Audiological Laboratory and Telecom Denmark, October 1993.

    10. EHIMA GSM Project, Development phase, Part II Project Report. Technical-Audiological
        Laboratory and Telecom Denmark, June 1994.

    11. EHIMA GSM Project Final Report, Hearing Aids and GSM Mobile Telephones: Interference
        Problems, Methods of Measurement and Levels of Immunity. Technical-Audiological Laboratory
        and Telecom Denmark, 1995.

    12. HAMPIS Report, Comparison of Mobile phone electromagnetic near field with an upscaled
        electromagnetic far field, using hearing aid as reference, 21 October 1999.

    13. Hearing Aids/GSM, Report from OTWIDAM, Technical-Audiological Laboratory and Telecom
        Denmark, April 1993.

    14. IEEE 100, The Authoritative Dictionary of IEEE Standards Terms, Seventh Edition.




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    15. Joyner, K. H, et. al., Interference to Hearing Aids by the New Digital Mobile Telephone System,
        Global System for Mobile (GSM) Communication Standard, National Acoustic Laboratory,
        Australian Hearing Series, Sydney 1993.

    16. Joyner, K. H., et. al., Interference to Hearing Aids by the Digital Mobile Telephone System, Global
        System for Mobile Communications (GSM), NAL Report #131, National Acoustic Laboratory,
        Australian Hearing Series, Sydney, 1995.

    17. Kecker, W. T., Crawford, M. L., and Wilson, W. A., “Contruction of a Transverse Electromagnetic
        Cell”, U.S. Department of Commerce, National Bureau of Standards, Technical Note 1011, Nov.
        1978.

    18. Konigstein, D., and Hansen, D., “A New Family of TEM Cells with enlarged bandwidth and
                                                              th
        Optimized working Volume,” in the Proceedings of the 7 International Symposium on EMC,
        Zurich, Switzerland, March 1987; 50:9, pp. 127-132.

    19. Kuk, F., and Hjorstgaard, N. K., “Factors affecting interference from digital cellular telephones,”
        Hearing Journal, 1997; 50:9, pp 32-34.

    20. Ma, M. A., and Kanda, M., ”Electromagnetic Compatibility and Interference Metrology,” U.S.
        Department of Commerce, National Bureau of Standards, Technical Note 1099, July 1986, pp.
        17-43.

    21. Ma, M. A., Sreenivashiah, I. , and Chang, D. C., “A Method of Determining the Emission and
        Susceptibility Levels of Electrically Small Objects Using a TEM Cell,” U.S. Department of
        Commerce, National Bureau of Standards, Technial Note 1040, July 1981.

    22. McCandless, G. A., and Lyregaard, P. E., Prescription of Gain/Output (POGO) for Hearing Aids,
        Hearing Instruments 1:16-21, 1983

    23. Skopec, M., “Hearing Aid Electromagnetic Interference from Digital Wireless Telephones, “IEEE
        Transactions on Rehabilitation Engineering, vol. 6, no. 2, pp. 235-239, June 1998.

    24. Technical Report, GSM 05.90, GSM EMC Considerations, European Telecommunications
        Standards Institute, January 1993.

    25. Victorian, T. A., “Digital Cellular Telephone Interference and Hearing Aid Compatibility—an
        Update,” Hearing Journal 1998; 51:10, pp. 53-60

    26. Wong, G. S. K., and Embleton, T. F. W., eds., AIP Handbook of Condenser Microphones: Theory,
        Calibration and Measurements, AIP Press.




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 PCTEST HAC REPORT                             FCC MEASUREMENT REPORT
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 HAC Filename:                Test Dates:        EUT Type:                    FCC ID:          Page 70 of 70
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© 2005 PCTEST Engineering Laboratory, Inc.



Document Created: 2005-07-27 16:16:19
Document Modified: 2005-07-27 16:16:19

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