EN 55014-1 标准解读2

利用带宽和上升时间的关系可以来近似确定信号的带宽，这样就可以确定某个干扰信号是宽带还是窄带干扰了。

利用带宽和上升时间的关系可以来近似确定信号的带宽，这样就可以确定某个干扰信号是宽带还是窄带干扰了。

针对这一点，我认为这样理解还是比较合理的，不知道有没有更准确的理解方法，大家有什么意见可以拿来出来分享下，追求最准确的理解。

4.1.1 Frequency range 148,5 kHz to 30 MHz (terminal voltages)
NOTE The World Administrative Radiocommunications Conference (WARC) has in 1979 reduced the lower
frequency limit in Region 1 to 148,5 kHz; for applications falling in the scope of this standard, tests at 150 kHz are
considered adequate, since 148,5 kHz falls within the receiver bandwidth.
The limits of the terminal disturbance voltages are given in Table 1. Terminal voltages are
measured, in accordance with Clause 5, on each terminal with respect to ground.
Terminals are defined as conductive parts, suitable for re-usable electrical connection to
external circuits.

4.1.1 端子骚扰电压，覆盖频率是148.5k到30M，其实这个项目就是我们平时说的传导（CE=conducted emission）。

但是注意在家电中，我们经常说是从0.15M-30M。这个在note里面有解释，1979年，世界无线电行政大会把频率1区的频率下限跳到了148.5k，但是对于标准的测试，我们一般选择的步长是1/2带宽。根据CISPR中Band B的带宽要求，从0.15M-30M的带宽是9K，则步长是4.5K，因此如果以150K为中频点，则覆盖的有效测试频率范围为145.5K-154.5K。则148.5是落在有效带宽的范围内的，则认为从0.15M开始测试也是满足要求的。

端子的理解（terminal）：其实EMC的测试多是对端口而言的，像什么外壳端口、交流端口、直流端口等等，这里的端子我们其实就可以理解为直流端口或者是交流端口。能够导电的端子。（外壳端口主要牵涉到RE/RS/ESD等项目）。
此外传导测试测试每根线对地的干扰，比如说L-PE或者是N-PE.一般很少涉及到三相电或者是两相电。一般都是直接接到市电上的单相电。

这里先传上CE的限值表格，因为以后很多条款的解释都要用到。称为table 1.

根据table 1绘制出来的限值图像如下图：

4.1.1.1 The limits in columns 2 and 3 shall be met on the phase(s) and the neutral of the
mains terminals of all appliances except those of electric tools.
4.1.1.2 On additional terminals of appliances as well as on load and additional terminals of
regulating controls incorporating semiconductor devices the relaxed limits given for "additional
terminals" in columns 4 and 5 apply.
Terminals which may be used as either mains terminals or load/additional terminals are
subject to the limits for mains terminals.
No terminal voltage limits apply for leads, which are not easily extensible by the user
(permanently connected, or provided with a specific connector), which are shorter than 2 m,
and which connect the equipment with an auxiliary apparatus or device, (e.g. semiconductor
speed controls, power plugs with AC-DC converters).
No terminal voltage limits apply to leads integrated in the suction hose of vacuum cleaners,
even if the length exceeds 2 m.
NOTE For the measurement at the load terminals and additional terminals of regulating controls incorporating semiconductor devices see 5.2.4, for additional terminals of other appliances see 5.2.3.

针对4.1.1.1和4.1.1.2这两个条款，是说明市电供电的家用器具（不包括电动工具）的端子要满足的限值。端子包括三种：电源端子、负载端子或者控制端子。标准中用的additional terminal，其实主要指的就是控制端子（个人看法）。
table1 的第2列和第3列，对应的电源端子的限值。L和N线都要满足限值。第4列和第5列是对除电源线以外其他的additional terminal端子的限值。我们可以发现电源端子的限值要比additional terminal端子的限值要严格。

如果电源端子和负载端子重合，则使用电源端子的限值，这也满足了要符合更严格测试限值的要求和理念。

如果是单独的additional terminal，则有要求的长度满足>2m,小于2m的是不做测试要求的。
此处有个特列，就是吸尘器的动力吸管，即使长度大于2m，也没有测试要求，其实这个可以理解的，因为动力吸管没有电结构部分，它完全靠的是电机吸收空气产生的动力，这个测试是没有意义的，所以就没有限制要求，即使长度超过了2m。

4.1.1.3 For the mains terminals of electric tools the particular limits given in columns 6 to 11
apply according to the rated power of the motor, the power of any heating device is to be
excluded (for instance heating power in a blower for plastic welding). For the load terminals
and additional terminals of electric tools, columns 4 and 5 apply without further relaxation.