1.1本试验方法提供了在交变极性磁场中测定磁屏蔽性能质量的方法。 1.2本试验方法提供了在标准试验线圈内确定适当均匀性的交变磁场强度所需值的方法。 1.3本试验方法提供了测定标准线圈内交变磁场强度的试验。 1.4本试验方法提供了确定由于在测量点周围插入磁屏蔽而产生的既定交变磁场衰减的试验。 1.5本试验方法应与规程A 34/A 34M结合使用，并应符合规程A 34/A 34M的要求。 1.6习惯（cgs）中规定的值和方程- emu和英寸磅）或国际单位应单独视为标准。在本试验方法中，括号中显示了国际单位制。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。组合两个系统的值可能会导致与试验方法不一致。 1.7 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This test method provides means for determining the performance quality of a magnetic shield when placed in a magnetic field of alternating polarity. 1.2 This test method provides means for establishing the desired value of alternating magnetic field strength, of suitable uniformity, inside a standard test coil. 1.3 This test method provides tests for determining the strength of the alternating magnetic field inside the standard coil. 1.4 This test method provides tests for determining the attenuation of the established alternating magnetic field due to the insertion of a magnetic shield around the point of measurement. 1.5 This test method shall be used in conjunction with and shall conform to the requirements of Practice A 34/A 34M. 1.6 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this test method, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the test method. 1.7 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.