ASTM D4935 PDF

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Active view current version of standard. Other Historical Standards. More D From the measured data, near-field SE values may be calculated for magnetic H sources for electrically thin specimens. 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. No other units of measurement are included in this standard.

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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Scope 1. Link to Active This link will always route to the current Active version of the standard.

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EMI 2560.5 Shielding Effectiveness

Historical Version s - view previous versions of standard. More D An uncertainty analysis is given in Appendix X1 to illustrate the probability of uncertainty achieved by an experienced operator using good equipment. Deviations from the procedure in this test method will increase this uncertainty.

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ASTM D4935

This test method provides a procedure for measuring the electromagnetic EM shielding effectiveness SE of a material due to a plane-wave, far-field EM wave. The test utilizes a coaxial transmission line to determine the shielding effectiveness of a given material. The test method is valid for a frequency range of 30 MHz to 1. Various thicknesses and types of materials can be tested to acquire a relative ranking of shielding effectiveness. The high heat distortion of the alloy is an improvement over ABS, while the low temperature impact resistance gives it an advantage over polycarbonate. No information supplied by RTP Company constitutes a warranty regarding product performance or use.

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

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