Dear Eric,
I do not think that you should interpret the list as mentioned below as a list of equipment falling under the EMC-directive. It is a list showing which apparatus might get disturbed by a not-EMC apparatus, and showing the relative importance of the EMC-directive related interference problems. This list is related to the Essential Requirements, and when the interference of an apparatus must be judged USING ESSENTIAL REQUIREMENTS -thus by a competent body- their investigation will be directed towards the prevention of interference to apparatus on this list. Educational apparatus show up here as a victim of EMC not as the cause. Educational equipment is however enumerated in the Guidelines, with the exception for studying Electro-magnetic phenomena in educational, research and training. They will however generate interference too, and as ALL electric and electronic apparatus have to fulfill essential requirements, educational equipment does too. However many educational equipment is used to show electronic principles and theory of operation, and is therefore constructed with an open architecture, often in the form of building blocks. Resistors, transistors meters, on a low level of integration and f.a. full microprocessor systems, FM-modulators, data acquisition boards etc at a high level of integration. There is no way in which interference from this kind of set up can be inherently prevented. The combination of misc. blocks is clearly some kind of experiment, very much related to the proto-type phase in an industrial environment. To my opinion in both applications there is some educational/learning function in the set up, and both relate to the same practical problems in application of the directive. The GUIDE to the EMC-directive (available on my website http://www.cetest.nl/features.htm in WORD format) excludes experiments form radio-amateurs if non-commercial. This is clearly not the route for educational systems. There are 2-3 other ways of showing exclusion from the directive - the educational building blocks are shown to be a component , having no direct function - the educational equipment has a EM studying function ( electronics is just a special case of EM-phenomena) , although this is clearly on the edge and was certainly not the authors had in mind (5.2.9) - the educational set up is not a finished product. (direct function is undefined) 3.7 Your second question regarding the definition of an experiment, becomes easy now: an experiment is a not-finished product. The reasons, as shown before should NOT be applied to any educational apparatus with a clear and definite function, such as demonstration voltmeters, demonstration computers, and has been intended to show a way of producing electronic or mixed technology KIT type equipment, used to show many different principles in an educational environment. Let me know what you think (group members too ) Regards, Gert Gremmen == CE-test, qualified testing, Consultancy, Compliance tests for EMC and Electrical Safety 15 Great EMC-design tips available ! Visit our site : http://www.cetest.nl The Dutch Electronics Directory http://www.cetest.nl/electronics.htm == -----Oorspronkelijk bericht----- Van: eric.lif...@natinst.com [SMTP:eric.lif...@natinst.com] Verzonden: dinsdag 24 februari 1998 23:52 Aan: cet...@cetest.nl CC: cefa...@mksinst.com; emc-p...@ieee.org Onderwerp: RE: CE question Ing. et al, I looked into this some time ago and determined that educational devices do not have an exemption under the EMC Directive, I quote it here: Quoting --- The maximum electromagnetic disturbance generated by the apparatus shall be such as not to hinder the use of in particular the following apparatus: (a) domestic radio and television receivers (b) industrial manufacturing equipment (c) mobile radio equipment (d) mobile radio and commercial radiotelephone equipment (e) medical and scientific apparatus (f) information technology equipment (g) domestic appliances and household electronic equipment (h) aeronautical and marine radio apparatus (i) educational electronic equipment (j) telecommunications networks and apparatus (k) radio and television broadcast transmitters (l) lights and fluorescent lamps. --- End Quote Item (i) clearly states that educational electronics are within the scope of the EMC Directive. Unless, is there some other directive that supercedes or augments 89/336 that reverses this requirement? What is your definition for an experimental device? I am curious because we have an educational product (made up strictly by electronics) that we redesigned and EMC tested for CE Mark compliance. Eric Lifsey Compliance Engineer National Instruments "Ing. Gert Gremmen" <cet...@cetest.nl> on 02/24/98 02:47:00 PM Please respond to "Ing. Gert Gremmen" <cet...@cetest.nl> To: "'Cefalo, Lisa'" <cefa...@mksinst.com> cc: "'EMC POST' (E-mail)" <emc-p...@ieee.org> (bcc: Eric Lifsey/AUS/NIC) Subject: RE: CE question Hello Lisa and group, If the equipment can be classified as experimental , which for education purposes is likely, then EMC requirements can be excluded. This is not true for Electrical Safety however, so if the equipment is mains supplied, at least (may be more parts ) the power supply should me ce-marked for electrical safety. I got in mind here a set up like an electronic kit in which a lot of separate units can be connected in a lot of ways to perform demonstrations. If i misunderstood, my apologies ! Regards, Ing. Gert Gremmen == CE-test, qualified testing, Consultancy, Compliance tests for EMC and Electrical Safety 15 Great EMC-design tips available ! Visit our site : http://www.cetest.nl The Dutch Electronics Directory http://www.cetest.nl/electronics.htm == -----Oorspronkelijk bericht----- Van: Cefalo, Lisa [SMTP:cefa...@mksinst.com] Verzonden: maandag 23 februari 1998 20:31 Aan: emc-p...@ieee.org Onderwerp: CE question I have a question regarding a unique piece of equipment to be shipped to the EC. It is is a training system used specifically at schools for vacuum training courses. Several components which make up this system are CE marked while a few are not. My question is "Is there an exception to the the EMC/LV directives which allows such training products to be shipped without compling?" If so, what and where? and also, what paperwork would be required to accompany the equipment? Any help is appreciated. Regards, Lisa Cefalo cefa...@mksinst.com
