ASTM-D4935 2010

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D4935-10 Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials

Published By	Publication Date	Number of Pages
ASTM	2010	10

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Categories: 17.220.20 - Measurement of electrical and magnetic quantities, ASTM

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Description

1.1 This test method provides a procedure for measuring the electromagnetic (EM) shielding effectiveness (SE) of a planar material for a plane, 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 as a result of 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 Units The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 This standard does not purport to address all of the safety concerns, if any, 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.

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PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Significance and Use Apparatus Test Specimens FIG. 1 FIG. 2
3	Preparation of Apparatus FIG. 3
4	Procedure Report Precision and Bias Keywords A1. SET OF FIGURES SUITABLE FOR USE IN THE CONSTRUCTION OF A SPECIMEN HOLDER A1.1 A1.2
5	FIG. A1.1 FIG. A1.2
6	FIG. A1.3 FIG. A1.4 FIG. A1.5
7	FIG. A1.6 FIG. A1.7
8	X1. ESTIMATE OF UNCERTAINTY OF SE MEASURED VALUES X1.1 X1.2 X1.3 X1.4 FIG. A1.8 FIG. A1.9
9	X1.5 X1.6 X1.7 X1.8 X2. COMPUTER PROGRAM FOR CALCULATING NEAR-FIELD SE VALUES X2.1 X2.2 X2.3 X2.4 X2.5 X2.6 TABLE X1.1
10	FIG. X2.1

Additional information

Standard Title	D4935-10 Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials
Published Code	ASTM
Publication Date	2010
Pages Count	10
ICS Codes	17.220.20 - Measurement of electrical and magnetic quantities

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ASTM-D4935 2010

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