Leitgeb N, Cech R, Schröttner J, Lehofer P, Schmidpeter U, Rampetsreiter M
Institute of Clinical Engineering, Graz University of Technology, Inffeldgasse 18, 8010 Graz, Austria.
Int J Hyg Environ Health. 2008 Mar;211(1-2):69-73. doi: 10.1016/j.ijheh.2007.03.005. Epub 2007 Jul 3.
More than 1000 electric appliances have been investigated regarding their emission of magnetic fields. It was found that complex frequency spectra are common and single frequency emissions are rare. Since exposure assessment requires frequency-weighted sums, root-mean-square values are not appropriate for comparison with exposure reference levels. It could be shown that they may underestimate emissions up to two orders of magnitude. Analysis of device groups showed a wide span of emission values of up to two orders of magnitude with only weak associations to power consumption. This demonstrates that there is a considerable potential to reduce fields without loss of performance. Exposure to magnetic fields of electric appliances are not negligible in daily life. Many devices considerably exceeded permitted reference levels and would require a closer analysis to demonstrate conformity with basic limits.
已经对1000多种电器的磁场发射情况进行了调查。结果发现，复杂的频谱很常见，单频发射很少见。由于暴露评估需要频率加权总和，因此均方根值不适用于与暴露参考水平进行比较。可以证明，它们可能会低估高达两个数量级的发射量。对设备组的分析表明，发射值范围很广，高达两个数量级，与功耗的关联较弱。这表明在不损失性能的情况下有相当大的降低磁场的潜力。在日常生活中，接触电器的磁场不可忽视。许多设备大大超过了允许的参考水平，需要进行更仔细的分析以证明符合基本限值。
