waltektony
发表于 2012-6-15 22:08:49
我想请问下楼主,在您的帖子了说到了关于2类即,通常不接地的非手持式器具的测试布置要求,那么关于带接地线的非落地式设备又该如何处理?是否可以按照落地式设备的测试高度处理,还是按照不接地的非手持式设备的条件?
再有就是有些实验室测试时,桌子的高度是80CM这样又有什么样的影响?还请解释下?
stone0371
发表于 2012-6-15 23:12:11
回复 31# waltektony
你接触过安规吗?带接地线的一般认为是I类产品,非落地式产品按照经验是按照台式产品来测试的,我感觉你理解的比较片面,分台式和落地式设备和I类还是II类无关,这里提出II类,不接地的设备,主要是为下面的模拟手的应用做分类依据的。在这里测试高度安排的重点是产品在典型工作过程中是落地式还是台式的。和产品的安全类别无关。
至于你提到的80cm的高度,这是FCC中EMC的要求,FCC和EN的现场布置还是有些区别的。
stone0371
发表于 2012-6-16 20:25:06
下面来解读模拟手的具体应用,
大家注意模拟手应用的对象是,通常不接地的手持式器具。这种产品一般在安规中归为II类产品。这是是前提。一定要注意。
stone0371
发表于 2012-6-16 20:26:32
5.2.2.2.1 When the casing of the appliance is entirely of metal, no metal foil is needed, but the terminal M of the RC element shall be connected directly to the body of the appliance.
当器具的外壳完全是金属时,不要金属箔,但是RC元件的M端应直接连接到器具的壳体上。
stone0371
发表于 2012-6-16 20:38:53
5.2.2.2.2 When the casing of the appliance is of insulating material, metal foil shall be wrapped round the handles, e.g. in Figure 8b, around handle B, and also round the second handle D, if present. Also metal foil 60 mm wide shall be wrapped round the body C at that
point where the iron core of the motor stator is located, or around the gearbox if this gives a higher disturbance level. All these pieces of metal foil, and the ring or bushing A, if present, shall be connected together and to the terminal M of the RC element.
当器具的外壳是绝缘材料时, 金属箔包裹在手柄上,如图8b中的手柄B,如果有的话,也包括手柄D。60mm宽的金属箔也应包裹壳体C,此点为电动机的铁芯处,或者如果引起较高的骚扰电平则包裹齿轮箱。所有的金属箔、卡圈或挡圈A,如果有的话,应连接在一起,在接至RC元件的M端。
stone0371
发表于 2012-6-16 20:45:19
下图是8b的包裹示意图。
stone0371
发表于 2012-6-16 20:53:45
5.2.2.2.2
5.2.2.2.2
在5.2.2.2.2中,大家除了要知道包裹的位置外,还要把握的一点是所有包裹部分的金属箔要连接成一个整体,模拟手的M端要连接到金属箔上去。
stone0371
发表于 2012-6-16 21:00:50
5.2.2.2.3 When the casing of the appliance is partly metal and partly insulating material, and has insulating handles, metal foil shall be wrapped round the handles, as handles B and D in Figure 8b. If the case is non-metallic at the location of the motor, a metal foil 60 mm wide shall be wrapped round the body C at that point where the iron core of the motor stator is located, or alternatively around the gearbox, if this is of insulating material and a higher disturbance level is obtained. The metal part of the body, the point A, the metal foil round the handles B and D and the metal foil on the body C shall be connected together and to the terminal M of the RC element.
当器具的外壳部分是金属,部分是绝缘材料,并且有绝缘手柄是,金属箔应包裹在手柄上,如图8b中的手柄B和D。如果电动机为的外壳是非金属的,则应用60mm宽的金属箔包裹在电动机铁芯处的壳体C上,或者包裹齿轮箱。如果它是绝缘材料的并且引起较高的骚扰电平。壳体的金属部分A点,包裹手柄B和D的金属箔,壳体C上的金属箔应连接在一起,在接到RC元件的M端。
stone0371
发表于 2012-6-16 21:06:17
5.2.2.2.4 When a class II appliance has two handles of insulating material A and B and a case of metal C, for example an electric saw (Figure 8c), metal foil shall be wrapped round the handles A and B. The metal foil at A and B and the metal body C shall be connected
together and to the terminal M of the RC element.
当II类器具具有绝缘手柄A,B和金属壳体C时,例如电圆锯(图8c),金属箔包裹手柄A和B。A和B的金属箔和金属壳体C应连接在一起,在接到RC元件的M端。
stone0371
发表于 2012-6-16 21:07:56
NOTE Classes 0, I, II and III according to IEC 61140: Classification of electrical and electronic equipment with regard to protection against electric shock.
note中说的就是安规中的根据电击防护把设备分为0、I、II、III类。具体的可以参考IEC 60335-1。