关于人类接触的1 Hz至100 kHz的直流磁场, 交流磁场以及交流电领域的测量. 第2部分: 基本测量标准. 推荐的水平标准

[中文适用范围]： 本部分 IEC 61786 提供了针对准静态磁场和电场（频率含量在 1 Hz 至 100 kHz 范围内）以及直流磁场进行测量的要求，以评估人体暴露于这些场的水平。具体而言，本标准规定了建立测量程序的要求，以实现与人体暴露相关的具体目标。由于不同环境中源的特性（如频率含量、时间和空间变化、极化和幅度）以及测量目标的不同，具体的测量程序在不同环境中会有所不同。本标准涵盖的幅度范围为：交流磁场 0.1 mT 至 200 mT（直流磁场 1 mT 至 10 T），电场 1 V/m 至 50 kV/m。当在此范围之外进行测量时，本标准的大多数条款仍然适用，但应特别注意指定的不确定度和校准程序。 [外文原描述]： IEC 61786-2:2014 provides requirements for the measurement of quasi-static magnetic and electric fields that have a frequency content in the range 1 Hz to 100 kHz, and DC magnetic fields, to evaluate the exposure levels of the human body to these fields. Specifically, this standard gives requirements for establishing measurement procedures that achieve defined goals pertaining to human exposure. Because of differences in the characteristics of the fields from sources in the various environments, e.g. frequency content, temporal and spatial variations, polarization, and magnitude, and differences in the goals of the measurements, the specific measurement procedures will be different in the various environments. Sources of fields include devices that operate at power frequencies and produce power frequency and power-frequency harmonic fields, as well as devices that produce fields independent of the power frequency, and DC power transmission, and the geomagnetic field. The magnitude ranges covered by this standard are 0,1 micro-Tesla to 200 mili-Tesla for AC (1 micro-Tesla to 10 Tesla for DC) for magnetic fields, and 1 V/m to 50 kV/m for electric fields. When measurements outside this range are performed, most of the provisions of this standard will still apply, but special attention should be paid to the specified uncertainty and calibration procedures. Examples of sources of fields that can be measured with this standard include: - devices that operate at power frequencies (50/60 Hz) and produce power frequency and power-frequency harmonic fields (examples: power lines, electric appliances...); - devices that produce fields that are independent of the power frequency.(Examples: electric railway (DC to 20 kHz); - commercial aeroplanes (400 Hz), induction heaters (up to 100 kHz), and electric vehicles); - and devices that produces static magnetic fields: MRI, DC power lines, DC welding, electrolysis, magnets, electric furnaces, etc. DC currents are often generated by converters, which also create AC components (power frequency harmonics), which should be assessed. When EMF products standards are available, these products standards should be used. With regard to electric field measurements, this standard considers only the measurement of the unperturbed electric field strength at a point in space (i.e. the electric field prior to the introduction of the field meter and operator) or on conducting surfaces. Sources of uncertainty during measurements are also identified and guidance is provided on how they should be combined to determine total measurement uncertainty.