1、 IEC/PAS 62825 Edition 1.0 2013-01 PUBLICLY AVAILABLE SPECIFICATION PRE-STANDARD Methods of measurement and limits for radiated disturbances from plasma display panel TVs in the frequency range 150 kHz to 30 MHz IEC/PAS 62825:2013(E) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 20
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9、0 2013-01 PUBLICLY AVAILABLE SPECIFICATION Methods of measurement and limits for radiated disturbances from plasma display panel TVs in the frequency range 150 kHz to 30 MHz INTERNATIONAL ELECTROTECHNICAL COMMISSION M ICS 33.100.10 PRICE CODE ISBN 978-2-83220-568-6 Registered trademark of the Intern
10、ational Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. PRE-STANDARD colour inside 2 PAS 62825 IEC:2013(E) CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 8 4 Limits for electrom
11、agnetic disturbances 8 General . 8 4.1Limits for radiated RF disturbances in the frequency range 150 kHz to 4.2 30 MHz 8 5 Measurement requirements 9 Ambient noise . 9 5.1Test sites 9 5.2Measuring equipment 9 5.3Measuring receiver 9 5.3.1Antenna . 9 5.3.2Configuration of the equipment under test . 1
12、0 5.4Operating conditions of the equipment under test 10 5.5 6 Measurement arrangement and procedure 10 Measurement arrangement 10 6.1Measurement procedure 10 6.2Reporting of measurement results . 10 6.3 7 Verification of the compliance of the equipment with the requirements of this specification .
13、11 Bibliography 12 Figure 1 Setup of a plasma display panel TV for magnetic-field measurement . 11 Figure 2 Top view of antenna positions relative to the EUT 11 Table 1 Limits of the magnetic field strength for large plasma display panel TVs 9 PAS 62825 IEC:2013(E) 3 INTERNATIONAL ELECTROTECHNICAL C
14、OMMISSION INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE _ METHODS OF MEASUREMENT AND LIMITS FOR RADIATED DISTURBANCES FROM PLASMA DISPLAY PANEL TVS IN THE FREQUENCY RANGE 150 KHZ TO 30 MHZ FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standar
15、dization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes Inter
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24、le for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. A PAS is a technical specification not
25、fulfilling the requirements for a standard, but made available to the public. IEC/PAS 62825 has been processed by CISPR subcommittee I: Electromagnetic compatibility of information technology equipment, multimedia equipment and receivers. The text of this PAS is based on the following document: This
26、 PAS was approved for publication by the P-members of the committee concerned as indicated in the following document: Draft PAS Report on voting CISPR/I/417/PAS CISPR/I/424/RVD Following publication of this PAS, which is a pre-standard publication, CISPR subcommittee I may decide to incorporate the
27、contents of this PAS as it is, or in a modified form, into CISPR 13 and/or CISPR 32. 4 PAS 62825 IEC:2013(E) This PAS shall remain valid for an initial maximum period of 3 years starting from the publication date. The validity may be extended for a single 3-year period, following which it shall be r
28、evised to become another type of normative document, or shall be withdrawn. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the corre
29、ct understanding of its contents. Users should therefore print this document using a colour printer. PAS 62825 IEC:2013(E) 5 INTRODUCTION The task of CISPR consists of providing methods of measurement and limits for control and limitation of RF disturbances from electric and electronic equipment, wh
30、ich may cause harmful interference to radio reception in the field. For these purposes CISPR has identified essential EMC emission requirements in the frequency range 9 kHz to 400 GHz. http:/www.iec.ch/Scope of CISPR In regard of the frequency range up to 30 MHz, minimum emission requirements for ra
31、diated RF disturbances have been established for induction cooking appliances (see CISPR 11 and CISPR 14-1) and for lighting equipment (see CISPR 15). According to the CISPR standardization policy http:/www.iec.ch/emc/pdf/cispr_standardisation_policy.pdf these requirements shall be regarded as apply
32、ing, as minimum requirements, to any type of product. In addition to the above fact it is noted that accurate measurements below 30 MHz are difficult and that the measurement method with the 60 cm loop antenna is not yet described in the CISPR 16 parts. Historically, emission standards for IT equipm
33、ent and radio broadcast receivers have addressed limits only for conducted emissions below 30 MHz (CISPR convention). This has been justified by the low “antenna efficiency” of an EUT whose dimensions are small compared with the wavelength of emission concerned, and by limited use of high-power, hig
34、h frequency electromagnetic components and circuitry within the EUT. However, the introduction of large-scale flat screen displays for many appliances such as TV-sets, traffic management and information systems, monitor walls in professional entertainment, education white boards, etc. calls into que
35、stion the convention that measurement of disturbance on external cabling is sufficient. Besides aspects of physical dimension, evolving display technologies too call for a regular re- assessment of the upper justification concerning antenna efficiency. Particular attention should be given to such te
36、chnological implementations, which use current loops in form of matrices of magnetic dipoles resulting in a large overall magnetic dipole causing significant magnetic field levels. Users of this specification are hence invited to check whether the classical CISPR convention applies to their display
37、implementations. Depending on the displays characteristics (voltage, current and size) they may decide, upon their own discretion, that measurements according to this specification can be disregarded, for principle reasons. During the annual CISPR subcommittee I Working Group (WG) 1 meeting in Sydne
38、y in 2007, a Task Force was formed to investigate radiated emissions of large Plasma TV-sets below 30 MHz following several cases of complaints of interference by amateur radio users. The TF met several times and carried out long investigations and round robin exercises in several laboratories in Ja
39、pan, Korea and Europe. The results of the investigation presented in Lyon in 2009, in Seattle in 2010, showed that supplementary requirements for control and limitation of radiated disturbances from large scale flat screen displays are necessary to enforce CISPRs mission and policy. Finally CISPR su
40、bcommittee I decided, at its meeting in Seoul in October 2011, that a PAS shall be drafted and provided to the users setting out an interim solution up until CISPR 13 or its successor CISPR 32 is supplemented with appropriate requirements. 6 PAS 62825 IEC:2013(E) Work is ongoing in CISPR subcommitte
41、e I and meanwhile also CISPR subcommittee A and CISPR subcommittee H are involved in the process of validating their respective methods of measurement and associated limits. The limits defined in this PAS have successfully taken the following points into consideration: a) Table 12 of CISPR 11:2009,
42、Amendment 1 (2010) defines limits for radiated emissions in the frequency range 9 kHz to 30 MHz for induction cooking appliances operating in residential and commercial environments. It is assumed that these limits provide adequate protection of radio reception and so formed basis for the limits in
43、this PAS. b) Current state of the art of plasma display panel TVs including economically feasible mitigation measures is such that they generate radiated emissions in the frequency range 150 kHz to 30 MHz above the limits of Table 12 of CISPR 11:2009, Amendment 1 (2010). Additionally, it is more dif
44、ficult to mitigate against low frequency magnetic field emissions below approximately 1 MHz. In particular, the emissions at the fundamental operating frequency of the displays cannot be attenuated without unacceptable loss of picture quality. Therefore a compromise was proposed in CISPR subcommitte
45、e I Working Group (WG) 1 to add 10 dB to the limits in Table 12 of CISPR 11:2009, Amendment 1 (2010). Following further discussions and review of measurements obtained from several plasma TVs manufacturers, it was noted that higher frequency emissions were more likely to meet this increased limit. E
46、missions below 3,5 MHz although typically over the limit were below the lower boundary of commonly-used radio amateur band. Therefore an additional 5 dB increase was allowed in the frequency range 150 kHz to 3,5 MHz and emissions at the fundamental frequency would be exempted from the limit. Althoug
47、h this proposal was not agreed unanimously during drafting of the PAS, consensus was reached. Therefore the limits defined in this PAS do not provide protection of radio reception in all cases. PAS 62825 IEC:2013(E) 7 METHODS OF MEASUREMENT AND LIMITS FOR RADIATED DISTURBANCES FROM PLASMA DISPLAY PA
48、NEL TVS IN THE FREQUENCY RANGE 150 KHZ TO 30 MHZ 1 Scope This Publicly Available Specification (PAS) applies to plasma display panel TVs which are intended for use in residential or commercial environments, which have a visible display area with a diagonal dimension of 1 m or greater, and which are
49、within the scope of CISPR 13 or CISPR 32. NOTE Although this PAS is applied to plasma display technology, it should be noted that in any future International Standard, or amendment to existing International Standard, it may be necessary to ensure technology neutrality. To this end, users of this PAS are invited to investigate the compliance of other display technologies with the limits of this PAS. Depending on the characteristics (voltage, current and size) of other display technologies, users may decide, upon their o
