EN 55014-1:2006+A1+A2标注解读 4

6 Methods of measurement of disturbance power (30 MHz to 300 MHz)

骚扰功率的测量（30M-300M）。

第六章讲的是另外一个测试项目骚扰功率（DP）的测量布置。

This clause lays down the general requirements for the measurement of disturbance power produced at the terminals of apparatus.
本章列出了由器具端子产生的骚扰功率测量的一般要求。

The operating conditions are given in Clause 7 of this standard.
运行条件在本部分第7章中给出。


It is generally considered that for frequencies above 30 MHz the disturbing energy is propagated by radiation to the disturbed apparatus.
一般认为，频率超过30MHz以上时，骚扰能量是通过辐射传播到被骚扰的器具的。

Experience has shown that the disturbing energy is mostly radiated by the part of the mains leads and other leads near the appliance. It is therefore agreed to define the disturbing capability of an appliance as the power it could supply to its leads. This power is nearly equal to that supplied by the appliance to a suitable absorbing device placed around these leads at the position where the absorbed power is at its maximum.
经验表明：骚扰能量主要是通过靠近器具的那部分电源引线和其他引线辐射的。因此同意用器具所能馈给电源引线的功率来确定其骚扰能力。该功率几乎等于器具馈给环绕这些引线的一个合适的吸收装置在吸收功率为最大值位置时的功率。

这句话应该这样理解，骚扰功率其实是辐射的一种测试项目，骚扰功率测试时是用过一个功率吸收钳在引线的每个位置所被馈给的最大功率值来确定的。


Calibration is accomplished in accordance with Annex B of CISPR 16-1-2.

校准按照CISPR16-1-2中附录B实施。

6.1 Measuring devices：测量设备。
6.1.1 Measuring receivers：测量接收机
Receivers with quasi-peak detectors shall be in accordance with Clause 4 of CISPR 16-1-1; receivers with average detectors shall be in accordance with Clause 6 of CISPR 16-1-1.


NOTE Both detectors may be incorporated in a single receiver and measurements carried out either using the quasi-peak detector or the average detecto。

测量接收机，和第五章内容一样的。

6.1.2 Absorbing clamp：功率吸收钳

The absorbing clamp shall be in accordance with Clause 4 of CISPR 16-1-3.
吸收钳应符合CISPR16-1-3中第四章的规定。

6.2 Measurement procedure on the mains lead

电源线上的测量程序。

6.2.1 The distance between the clamp test set-up (the appliance, the lead to be measured and the absorbing clamp) and any other conductive objects (including persons, walls and ceiling, but excluding the floor) shall be at least 0,8 m. The appliance to be tested shall be placed on a non-metallic support table parallel to  the floor. The height of the table shall be 0,1 m ± 0,025 m for appliances primarily intended to be positioned on the floor in normal use, and 0,8 m ± 0,05 m for other appliances.
吸收钳与其他导体部分至少保持0.8m的距离，受试器具放在与地面平行的非金属支撑面上，对于落地式产品来说，支撑面的高度是0,1 m ± 0,025 ，对其他产品来说桌子的高度是 0,8 m ± 0,05 m。

The lead to be measured is placed in a straight line for a distance sufficient to accommodate the absorbing clamp, and to permit the necessary measuring adjustment of position for tuning. The clamp is placed around the lead.

测量引线应延长成一直线，以保证足够的长度容纳吸收钳，并且允许于频率协调时必要的测量位置调节。吸收钳应环绕引线放置。

6.2.2 The absorbing clamp is positioned for maximum indication at each test frequency: the clamp shall be moved along the lead until the maximum value is found between a position adjacent to the appliance and a distance of about a half-wavelength from it.
NOTE The maximum may occur at a distance close to the appliance.

吸收钳的放置应使每一测量频率上知识出最大值；吸收钳应沿引线移动直到在靠近器具的位置和与器具相距半个波长的距离之间找到最大值。

注：最大值可能出现在距离器具较近的位置。

6.2.3 The straight portion of the lead to be measured on should therefore be about 6 m long, this being equal to λ max/2 + 0,6 m in order to allow at any time the positioning of the absorbing clamp and a possible second clamp for additional isolation.

被测引线的拉直部分之所以6m长，是因为这个长度等于（λ max/2 + 0.6 ）m，目的是允许随时为吸收钳和为了附加隔离的另一只铁氧体吸收钳的定位。

这个6m，其实严格地说应该是5.6m。根据：速度=波长*频率的公式来计算。速度取光速。

V=3×108(m/s)=30×106*λ。根据该公式可以得知，波长与频率成反比，因此λmax对应的频率应该是30M，则可以λmax是10m。

因此得到5.6m。