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    ASTM D4935-99

    Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials (Withdrawn 2005)
    • 발행일 : 1999-04-10 (2005-10-28 폐지)
    • 발행기관 : ASTM
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분야 10.02 : 전기절연 (Ⅱ)
적용범위

1.1 This test method provides a procedure for measuring the electromagnetic (EM) shielding effectiveness (SE) of a planar material due to a plane-wave, far-field EM wave. From the measured data, near-field SE values may be calculated for magnetic (H) sources for electrically thin specimens. Electric (E) field SE values may also be calculated from this same far-field data, but their validity and applicability have not been established.

1.2 The measurement method is valid over a frequency range of 30 MHz to 1.5 GHz. These limits are not exact, but are based on decreasing displacement current due to decreased capacitive coupling at lower frequencies and on overmoding (excitation of modes other than the transverse electromagnetic mode (TEM)) at higher frequencies for the size of specimen holder described in this test method. Any number of discrete frequencies may be selected within this range. For electrically thin, isotropic materials with frequency-independent electrical properties of conductivity, permittivity and permeability, measurements may be needed at only a few frequencies as the far-field SE values will be independent of frequency. If the material is not electrically thin or if any of the parameters vary with frequency, measurements should be made at many frequencies within the band of interest.

1.3 This test method is not applicable to cables or connectors.

1.4 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

국제분류(ICS)코드 17.220.20 : 전기 및 자기량 측정
페이지수 10
Edition 99

이력정보

No. 표준번호 표준명 발행일 상태
1 ASTM D4935-18 REDLINE상세보기 Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials 2018-05-01 표준
2 ASTM D4935-18상세보기 Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials 2018-05-01 표준
3 ASTM D4935-10상세보기 Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials 2010-05-01 구판
4 ASTM D4935-99상세보기 Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials (Withdrawn 2005) 1999-04-10 구판

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