Bsi bs en 55103 2 2009

BS EN 55103-2:2009 BSI British Standards Electromagnetic compatibility — Product family standard for audio, video, audio-visual and entertainment lighting control apparatus for professional use — Part 2: Immunity NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide™ BRITISH STANDARD BS EN 55103-2:2009 National foreword This British Standard is the UK implementation of EN 55103-2:2009 It supersedes BS EN 55103-2:1997, which will be withdrawn on July 2012 The UK participation in its preparation was entrusted by Technical Committee GEL/210, EMC - Policy committee, to Subcommittee GEL/210/11, EMC product standards A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © BSI 2009 ISBN 978 580 55924 ICS 33.100.20; 33.160.01 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2009 Amendments issued since publication Amd No Date Text affected BS EN 55103-2:2009 EUROPEAN STANDARD EN 55103-2 NORME EUROPÉENNE July 2009 EUROPÄISCHE NORM ICS 33.100.20 Supersedes EN 55103-2:1996 English version Electromagnetic compatibility Product family standard for audio, video, audio-visual and entertainment lighting control apparatus for professional use Part 2: Immunity Compatibilité électromagnétique Norme de famille de produits pour les appareils usage professionnel audio, vidéo, audiovisuels et de commande de lumière pour spectacles Partie 2: Immunité Elektromagnetische Verträglichkeit Produktfamiliennorm für Audio-, Videound audiovisuelle Einrichtungen sowie für Studio-Lichtsteuereinrichtungen für professionellen Einsatz Teil 2: Störfestigkeit This European Standard was approved by CENELEC on 2009-07-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels © 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 55103-2:2009 E BS EN 55103-2:2009 EN 55103-2:2009 -2- Foreword This European Standard was prepared by the Technical Committee CENELEC TC 210, Electromagnetic compatibility (EMC) The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 55103-2 on 2009-07-01 This European Standard supersedes EN 55103-2:1996 The following dates were fixed proposed: – – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2010-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2012-07-01 This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers protection requirements of EC Directive 2004/108/EC See Annex ZZ _ BS EN 55103-2:2009 -3- EN 55103-2:2009 Contents Scope Normative references Definitions Electromagnetic environment Disturbing phenomena Immunity requirements 7 Testing 12 7.1 Performance criteria 12 7.2 General 12 7.3 Ports 13 7.4 Sub-assemblies 13 7.5 Racks and cabinets 14 Documentation for the purchaser/user 14 8.1 Documentation which shall be supplied to the purchaser/user 14 8.2 Documentation which shall be available to the purchaser/user upon request 14 Annex A (normative) Method of measurement of immunity to radiated magnetic fields, 50 Hz to 10 kHz 15 Annex B (normative) Methods of measurement of common mode immunity for balanced signal and control ports intended to be connected to cables whose total length according to the manufacturer’s specification may exceed 10 m; 50 Hz to 10 kHz 20 Annex C (informative) Apparatus using infra-red radiation for open-air transmission purposes 26 Annex D (informative) Guidance for test houses on immunity testing of audio, video, audiovisual and entertainment lighting control apparatus for professional use 27 Annex E (informative) Background information about this standard 31 Annex ZZ (informative) Coverage of Essential Requirements of EC Directives 32 Bibliography 33 Figures Figure - Examples of ports Figure A.1 - Construction of Helmholtz coils for homogeneous fields 17 Figure A.2 - Construction of the radiating loop for inhomogeneous fields 18 Figure A.3 - Typical test setup for immunity to inhomogeneous magnetic field 18 Figure B.1 - Test interface - Test set-up 20 Figure B.2 - Calibration arrangement for test set-up 21 Figure B.3 - Test set-ups 23 Figure B.4 - Equaliser circuit 23 Tables Table - Immunity requirements Table B.1 - Test method selection 19 Table D.1 - Five-point scales for subjective assessment 29 BS EN 55103-2:2009 EN 55103-2:2009 -4- Scope This European Standard for EMC immunity requirements applies to professional audio, video, audiovisual and entertainment lighting control apparatus as defined in 3.6 intended for use in the environments described in Clause This includes the digital apparatus defined in 3.5 and sub-assemblies, see 7.4 Disturbances in the frequency range Hz to 400 GHz are covered, but requirements are not established over the whole of that range NOTE In Annex C, information is included on infra-red radiation in the wavelength range 0,7 µm to 1,6 µm The objective of this standard is to define the immunity test requirements, test signals, performance criteria and test methods for apparatus defined in the scope, in relation to electromagnetic immunity to continuous and transient conducted and radiated electromagnetic disturbances including electrostatic discharges These test requirements represent essential electromagnetic compatibility requirements Fault conditions of source or victim apparatus are not taken into account Apparatus as defined in 3.4, 3.5 and 3.6 may be operated with any source of power NOTE Sources of power may include, for example: the public low-voltage supply; private supplies with similar characteristics; a d.c source provided specifically for the apparatus; batteries internal to the apparatus; stand-by generators Some standards may not apply to private low-voltage supplies NOTE If it is intended to use a hand-held transmitter in proximity, additional mitigation measures may have to be employed to increase the electromagnetic immunity further, beyond the specified limits This European Standard does not apply to – consumer apparatus, – apparatus specifically designed for security systems, – apparatus designed to radiate electromagnetic energy for radio communications purposes Normative references The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 55020 2007 Sound and television broadcast receivers and associated equipment Immunity characteristics - Limits and methods of measurement (CISPR 20:2006) EN 61000-3-2 2006 Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current emissions (equipment input current ≤ 16 A per phase) (IEC 61000-3-2:2005) EN 61000-4-2 + A1 + A2 1995 1998 2001 Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement techniques - Electrostatic discharge immunity test (IEC 61000-4-2:1995 + A1:1998 + A2:2000) EN 61000-4-3 + A1 2006 2008 Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2006 + A1:2007) EN 61000-4-4 2004 Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test (IEC 61000-4-4:2004) BS EN 55103-2:2009 -5- EN 55103-2:2009 EN 61000-4-5 2006 Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test (IEC 61000-4-5:2005) EN 61000-4-6 2007 Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radiofrequency fields (IEC 61000-4-6:2003 + A1:2004 + A2:2006) EN 61000-4-11 2004 Electromagnetic compatibility (EMC) - Part 4-11: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests (IEC 61000-4-11:2004) EN 61000-6-2 2005 Electromagnetic compatibility (EMC) - Part 6-2: Generic standards Immunity for industrial environments (IEC 61000-6-2:2005) HD 483.1 S2 1989 Sound system equipment - Part 1: General (IEC 60268-1:1985 + A1:1988) Definitions For the purposes of this document, the following terms and definitions apply Definitions related to EMC and to relevant phenomena may be found in the EU Directive on EMC (2004/108/EC), in IEC 60050-161 and in other IEC and CISPR Publications 3.1 electromagnetic compatibility the ability of a device, unit of equipment or system to function satisfactorily in its electromagnetic environment without introducing intolerable disturbances to anything in that environment 3.2 port particular interface of the specified apparatus with the electromagnetic environment (see Figure 1) 3.3 enclosure port the physical boundary of the apparatus through which electromagnetic fields may radiate or impinge 3.4 professional apparatus apparatus for use in trades, professions or industries and which is not intended for sale to the general public 3.5 professional digital apparatus professional apparatus designed for the purpose of controlling audio, video, audiovisual or entertainment lighting characteristics, by means of periodic pulsed electrical waveforms, or of processing audio, video or lighting control signals in digital form 3.6 professional entertainment lighting control apparatus professional apparatus producing electrical control signals for controlling the intensity, colour, nature or direction of the light from a luminaire, where the intention is to create artistic effects in theatrical, television or musical productions and visual presentations 3.7 test report the documentation of the EMC tests performed, and their results, prepared by the persons who carried out the tests, for example the manufacturer or a test laboratory BS EN 55103-2:2009 EN 55103-2:2009 -6- 3.8 screened-cable port a signal, control or DC power port on a metal-cased apparatus intended for the termination of a braid-screened cable where provision is made for direct, low impedance connection between the cable screen and the case of the apparatus Where a connector is used it shall provide either a 360° continuous connection between the screen and the case, or at least four points of connection distributed around the connector aperture NOTE This definition does not permit single-point earthing of the cable screen nor connection of the screen to the case via any component intended to provide an impedance 3.9 functional earth port an earth terminal not marked as a protective earth terminal Enclosure port a.c power ports earth ports Apparatus d.c power ports signal/control ports Figure - Examples of ports Electromagnetic environment Sets of requirements are specified in Clause for the following five environments The apparatus shall comply with one or more of the sets of requirements It is the responsibility of the manufacturer to apply the appropriate set or sets of requirements to his apparatus (see 7.1) E1 Residential (including both of the location types class and found in IEC 61000-2-5) E2 Commercial and light industrial (including, for example, theatres, and television studios which are not purpose-built studios) E3 Urban outdoors (based on the definition of location type class in IEC 61000-2-5) E4 Controlled EMC environment (for example purpose-built broadcasting or recording studio), and the rural outdoors environment (far away from railways, transmitters, overhead power lines, etc.) NOTE A controlled EMC environment exists in a building where the installation has been designed having special regard to EMC, and where technical personnel are present with experience of EMC technology E5 Heavy industrial (see EN 61000-6-2); and environments close to broadcast transmitters NOTE Situations arise where the level of disturbance may exceed the levels specified in this standard for example where an apparatus is installed in proximity to ISM apparatus as defined in EN 55011 or where a hand-held transmitter is used in close proximity to an apparatus In these instances special mitigation measures may have to be employed BS EN 55103-2:2009 -7- EN 55103-2:2009 Disturbing phenomena This standard sets requirements for the following disturbing phenomena (see Table 1): 1) RF electromagnetic field; 2) electrostatic discharge; 3) magnetic fields; NOTE There are two tests, with a homogenous field (3a) and an inhomogenous field (3b) The inhomogeneous field test is specifically intended to test immunity to fields acting on the surface of rack mounted apparatus and investigates poor screening 4) fast transients, common mode; 5) audio frequency common mode; 6) RF common mode; 7) surges, line-to-line and line-to-earth; 8) voltage dips; 9) voltage interruptions Immunity requirements Apparatus within the scope of this standard shall comply with the requirements of this standard independently of the nature of its source of power Some example sources are listed in Clause The immunity requirements are shown in Table Enclosure Port 50 Hz to 10 kHz 50 Hz to 10 kHz 3b Magnetic field, inhomogenous A/m to 0,03 A/m 50 Hz to kHz 0,03 A/m kHz to 10 kHz A/m to 0,01 A/m 50 Hz to kHz 0,01 A/m kHz to 10 kHz V/m V/m 10 V/m 10 A/m to 0,1 A/m 50 Hz to kHz 0,1 A/m kHz to 10 kHz 0,008 A/m kHz to 10 kHz kV air 0,8 A/m to 0,008 A/m 50 Hz to kHz kV air kV contact kV contact no test no test V/m Test levels Test levels E4 E5 0,4 A/m, 500 Hz to 10 kHz Annex A EN 61000-4-2 EN 61000-4-3 Applicable standard A B A 1&2 Performance Notes Criterion Applicable only to apparatus intended for rack-mounted applications Inhomogeneous magnetic field decreasing linearly with the logarithm of frequency from 50 Hz to 500 Hz and constant from 500 Hz to 10 kHz (see A.5) Apparatus used in close proximity to television monitors shall be tested at 15,625 kHz using the 10 kHz limit CRT disturbance is permitted above A/m Applicable only to apparatus NOT intended for rack-mounted applications Homogeneous/pseudo-homogeneous magnetic field decreasing linearly with the logarithm of frequency from 50 Hz to kHz and constant from kHz to 10 kHz (see A.3 and A.4 for details of test configuration) CRT disturbance is permitted above 1A/m The carrier signal is amplitude modulated to a depth of 80 % by a kHz sine wave The test levels are set up with the carrier signal unmodulated For broadcast radio and television receivers, EN 55020 applies List of notes EN 55103-2:2009 A/m to 0,4 A/m, 50 Hz to 500 Hz E2 and E3 E1 kV air kV contact V/m 2,0 GHz to 2,7 GHz Not applicable V/m V/m 80 MHz to 000 MHz 1,4 GHz to 2,0 GHz Test levels E1 to E Frequency range 3a Magnetic field, homogenous Electrostatic discharge RF electromagnetic field Phenomenon Table - Immunity requirements BS EN 55103-2:2009 -8- BS EN 55103-2:2009 EN 55103-2:2009 - 22 - Figure B.2 - Calibration arrangement for test set-up B.3.2.2 Test procedure Sweep the frequency range 50 Hz to 10 kHz whilst ensuring that Uin remains constant at the value used in B.3.2.1b), and confirm that the performance of the apparatus under test continues to meet the specified performance criterion throughout the test B.3.3 Test set-up This test method is applicable to all balanced ports except balanced ports for connection to PSTN and similar lines A test signal is injected into the common-mode loop comprising: the apparatus under test and its earth connection, the port under test, the interface cable, the auxiliary apparatus connected to the port and its earth connection It is permissible to use a simulator which has the characteristics of the auxiliary apparatus Two test options are defined: - option in which the test signal is applied via an isolating transformer in series with the earth connection of the apparatus under test (refer to Figure B.3 a)); - option in which the test signal is coupled to a cable to the port under test by a current injection transformer (refer to Figure B.3 b)) The use of option is only permitted where the apparatus under test can be configured so that there is no return path for common-mode signals other than via the port under test B.3.3.1 General test requirements Ports shall be selected for testing according to 7.3 and subjected to the test level given in B.3.3.4 Where the manufacturer recommends a particular type of cable for connections to the apparatus, it is essential that the recommended cable be used in the tests The cable length used in the test shall be at least m An auxiliary apparatus or simulator shall terminate the port(s) to which it is connected in accordance with the manufacturer's recommendations BS EN 55103-2:2009 - 23 - B.3.3.2 EN 55103-2:2009 Test apparatus The following are required: - a test signal generator covering the frequency range 50 Hz to 10 kHz and capable of providing sufficient output terminal voltage to meet the requirement stated in B.3.3.4; - a double wound current transformer with a current ratio of 1:n and having known frequency response (for option 1), or a current transformer with a current ratio of 1:n and having known frequency response (for option 2); - a high impedance, audio frequency voltmeter; - the appropriate auxiliary apparatus (or simulator) to terminate and/or supply the port under test, and other auxiliary apparatus required to operate the apparatus in a manner representing normal operation; - an interface cable in accordance with the manufacturer's recommendations for the port under test B.3.3.3 B.3.3.3.1 Test set up Option This option shall be used only when the apparatus under test can be isolated from earth and where there is a single common-mode loop which includes the apparatus under test The test configuration is shown in Figure B.3 a) The test signal shall be applied in series with the earth connection of the apparatus under test The port under test shall be connected to auxiliary apparatus (or a simulator) The common-mode impedance between the secondary of the transformer and the auxiliary apparatus shall be minimised by bonding the auxiliary apparatus and the secondary of the transformer to a common reference earth point B.3.3.3.2 Option The test configuration is shown in Figure B.3 b) The test signal is magnetically coupled into a cable connected between the port under test and the auxiliary apparatus (or simulator) The common-mode impedance between the apparatus under test and earth, and between the auxiliary apparatus (or simulator) and earth, shall be minimised by bonding any external conducting parts to a common reference point and supplying the two apparatus from a common power source (where this is possible) B.3.3.4 Test procedure The transformer shall be driven from the test signal generator via the equaliser network shown in Figure B.4, or an alternative arrangement providing the same voltage versus frequency, and impedance versus frequency characteristics at the secondary side of the transformer U and R1 in Figure B.4 are chosen so that when points X-X are joined, the current through R1 is 0,2/n A It is essential that R1 is at least 16 n Ω to preserve the accuracy of the current/frequency characteristic within + 0/- 0,5 dB at 10 kHz For example, a test signal generator output voltage, U, of 100 V r.m.s., a series resistor of value 500 Ω and a shunt network comprising a 6,48 mH inductor and a 20,25 Ω resistor, will provide the desired test levels for an ideal transformer having a current ratio of 1:9 BS EN 55103-2:2009 EN 55103-2:2009 - 24 - The specified test levels shall be applied and the performance of the apparatus under test assessed in accordance with the relevant performance criterion given in Table The test method has been designed to allow automatic frequency sweep measurements; but if a sweep method is not used, a sufficient number of frequencies within the specified range shall be tested to give confidence that the specified performance criteria are met over the whole of the specified frequency range During the test the terminal voltage of the test signal generator shall be monitored to maintain the output voltage constant It is an inherent feature of this test method that the auxiliary apparatus (or simulator) is subject to the same test stress as the apparatus under test The test engineer shall ensure that any noted performance variations are due to the apparatus under test alone Figure B.3 a) – Test configuration of option Figure B.3 b) – Test configuration of option Figure B.3 - Test set-ups BS EN 55103-2:2009 - 25 - Figure B.4 - Equaliser circuit EN 55103-2:2009 BS EN 55103-2:2009 EN 55103-2:2009 - 26 - Annex C (informative) Apparatus using infra-red radiation for open-air transmission purposes The following applies to apparatus responding to infra-red radiation of wavelengths between 0,7 µm and 1,6 µm Any infra-red communication or control device forming an integral part of the apparatus within the scope of this standard should be designed to work under conditions of high intensity discharge tube and/or tungsten illumination such as may be found in TV or film studios or on theatrical stages or concert platforms It is particularly important that reliance should not be placed on the use of adjustable shades over the infra-red receptors since the anticipated conditions of use imply that the receptors will be mobile and their positions may not be under the direct control of the operator of the apparatus If infra-red signals may be received by apparatus covered by this standard, either for control purposes or as programme data, the user should be advised of the ways the apparatus should be set up and used to ensure correct operation Requirements and methods of measurement for any infra-red ports forming part of the apparatus covered by this standard are under consideration EN 60825 contains counsel on safety aspects Guidance and useful information on the use of infra-red communication and control devices may be found in EN 61603 (series) BS EN 55103-2:2009 - 27 - EN 55103-2:2009 Annex D (informative) Guidance for test houses on immunity testing of audio, video, audio-visual and entertainment lighting control apparatus for professional use D.1 Subjective testing D.1.1 Introduction In the present state of knowledge, the complete objective specification of performance for the apparatus (particularly video apparatus) described in this product family standard with respect to immunity requirements may not be possible In these circumstances, therefore, the performance should first be assessed informally using the procedures described in the next section It may later be established by a simplified form of the subjective testing standardised by the ITU/R in Recommendations 500-4 and 562-3 (see D.1.4) D.1.2 D.1.2.1 The use of simple functional tests for the initial assessment of immunity Introduction Guidance is given here on the rapid qualitative identification of lack of immunity, indicating which disturbing phenomena and performance characteristics require detailed quantitative investigation The identification procedure is a series of simple functional tests in the presence of a level of each test stimulus not less than the limit value specified in the standard However, in the case of the electrostatic discharge test where the apparatus under test may be permanently damaged, it is recommended that an initial test be omitted altogether This procedure is intended to minimise unnecessary testing For this reason, it is suggested that these tests be carried out before any objective testing D.1.2.2 Manufacturer's specification The manufacturer's performance specification for the apparatus should identify all those characteristics which are basic indicators of the correct functioning of the apparatus D.1.2.3 Functional test procedure The apparatus under test is set up for normal operation (together with such auxiliary apparatus as is necessary) in the presence of each test stimulus in turn, applied at a level not less than the limit value specified in the standard and the normal functioning of the apparatus is observed subjectively The output signal of audio apparatus is listened to, that of video apparatus is displayed and viewed, and the illumination produced by luminaires controlled by lighting control apparatus is observed, under suitable conditions It is essential to ensure that any auxiliary apparatus is not exposed to the test stimulus, or is sufficiently immune to it Where the test stimulus is of a continuous nature, it should be turned on and off at intervals to aid identification of any changes in the subjective observations It is strongly recommended that a suitably qualified representative of the manufacturer should attend these tests in order to discuss the details of the procedure, and the significance and implications of the results, with the test house personnel It may be necessary, in order to avoid exposing the observers to the test stimulus, to view the apparatus by closed-circuit television BS EN 55103-2:2009 EN 55103-2:2009 D.1.2.4 - 28 - Examples of symptoms of lack of immunity • Audio apparatus: - reduced signal-to-noise ratio; - increased non-linearity distortion; - clicks and pops; - pitch variations (analogue recording and replay apparatus); - intermittent muting (digital apparatus); - change of operating mode (electronically-controlled apparatus); - change of gain • Video apparatus: - reduced signal-to-noise ratio; - spots and flashes; - transverse banding; - moire patterns; - loss of sync, partial or complete: • line tearing; • cogging; • frame roll; • noise banding; • break-up; - white and/or black crush; - intermittent muting (digital apparatus); - change of operating mode (electronically-controlled apparatus) • Lighting control apparatus: - flicker; - change of brightness, including false full-on or black-out; - loss of control of brightness; - incorrect operation of automatic sequence; - change of operating mode; - incorrect operation of aiming gear; - incorrect operation of colour-change gear D.1.2.5 Practical significance of lack of immunity It should be understood, particularly for those tests to which Criterion A is to be applied, that the degradation of performance which is acceptable depends in many cases on the precise intended purpose of the apparatus For example, a piece of audio apparatus intended for making recordings would be expected to exhibit less degradation of signal-to-noise ratio due to clicks and pops than a rather similar piece of apparatus intended for the processing of live sound BS EN 55103-2:2009 - 29 - D.1.3 EN 55103-2:2009 Criteria for more formal testing The criteria are defined in full in 7.1 but may be summarised for convenience in brief as: - criterion A: no degradation of performance during or after the test beyond a limit stated by the manufacturer; NOTE This degradation limit is expected to be similar to the most unfavourable limit of the normal performance specification in most cases, but this is not mandatory A limit much different from the normal specification limit would be expected to be justified by the manufacturer to prospective users in the instruction manual or similar document - criterion B: degradation (small or large, but not loss of data or operating state) during the test, but conformity with the specification after the test; - criterion C: degradation during the test and, temporarily, after the test, but conformity with the specification after either automatic recovery or adjustment of the controls by the operator NOTE The acceptable duration implied by 'temporarily' depends on the application of the apparatus 'Adjustment of controls' does not include such activities as replacement of fuses, which are classed as 'repairs' The performance limits for criterion A, unless specifically stated by the manufacturer, should be taken as the most lax limits of the normal performance specification The level of performance for criterion B is defined either by the manufacturer or inferred from the manufacturer's literature or what the user might reasonably expect Criterion C relates to an unspecified degradation of performance level or to a failure of control status, where either causes a temporary failure D.1.4 Use of subjective assessment In order to determine conformity with these criteria for those tests not involving transient phenomena, ITU/R Recommendations 562-3 (for audio) and 500-4 (for video) should be used as the basis for assessment The Recommendations lay down established procedures which are known to give statistically significant results; however, in view of the accepted uncertainties in the measurement of the applied test signals and fields, a reduced subjective test procedure is considered to provide sufficient accuracy A subjective assessment panel of five persons can set acceptability levels to at least the same precision as is presently possible in the determination of the relevant characteristics of test signals The Recommendations specify five levels of performance using a subjective evaluation technique, based on 'Quality' and 'Impairment' tables: Table D.1 - Five-point scales for subjective assessment Quality Impairment Level Description Level Description Excellent Imperceptible Good Perceptible, but not annoying Fair Slightly annoying Poor Annoying Bad Very annoying BS EN 55103-2:2009 EN 55103-2:2009 D.1.5 - 30 - Test procedure Annex of ITU/R 562-3 has very detailed advice and suggested recommended practice for the methods of assessment of these impairment levels in order to ensure valid and consistent results on a repeatable basis and includes the following topics: - selection of the listening panel, expert and inexpert listeners; - test procedures and durations, sequences, timings and rest periods; - programme material; - reproduction devices: loudspeakers and/or headphones; - sound pressure levels and their measurement; - listening conditions: room and background noise Similar recommended practices for the equivalent aspects of this method of testing when applied in the vision domain to video apparatus are contained in ITU/R 500-4 D.2 Objective testing The following performance characteristics are recommended for checking during immunity testing D.2.1 Audio - Signal-to-noise ratio (EN 60268-3) - THD + noise (EN 60268-3) - Maximum output voltage or power (EN 60268-3) at rated total harmonic distortion (possibly optional: THD + noise can suffice for most operations) - Clicks (measurement of audio output signals to be quasi-peak, see HD 483.1) - Input overload margin (where a variable gain element is included in the path between input and output) - Speed variation of recording and reproducing apparatus (see EN 60384) D.2.2 Control electronics Incorrect or spurious operation D.2.3 Video - Gain, including chrominance/luminance gain inequality for composite systems - Superimposed d.c on outputs - Black level errors in apparatus with re-insertion of synchronisation and blanking - Colour casts in component apparatus - Chrominance gain and/or phase errors on colour bars - Noise - Bit errors ("sparkles") in digital apparatus - Intermittent "freezing" of synchronisers and standards converters - Incorrect synchronisation signals, especially where synchronisation signals are replaced or processed - Synchronisation timing jitter and chrominance or clock phase jitter BS EN 55103-2:2009 - 31 - EN 55103-2:2009 Annex E (informative) Background information about this standard For more information on the background underlying this standard, see Annex G of the companion standard EN 55103-1 BS EN 55103-2:2009 EN 55103-2:2009 - 32 - Annex ZZ (informative) Coverage of Essential Requirements of EC Directives This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope the standard covers protection requirements of Annex I Article 1(b) of the EC Directive 2004/108/EC Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive concerned WARNING: Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard BS EN 55103-2:2009 - 33 - EN 55103-2:2009 Bibliography EN 55011 Industrial, scientific and medical (ISM) radio-frequency equipment Electromagnetic disturbance characteristics - Limits and methods of measurement (CISPR 11) EN 55103-1 Electromagnetic compatibility - Product family standard for audio, video, audio-visual and entertainment lighting control apparatus for professional use - Part 1: Emissions EN 60268 (multi-part) Sound system equipment (IEC 60268) EN 60384 (multi-part) Fixed capacitors for use in electronic equipment (IEC 60384) EN 60825 (multi-part) Safety of laser products (IEC 60825) EN 61603 (multi-part) Transmission of audio and/or video and related signals using infrared radiation (IEC 61603) IEC 60050-161:1990 International Electrotechnical Electromagnetic compatibility IEC 61000-2-5:1995 Electromagnetic compatibility (EMC) – Part 2-5: Environment Classification of electromagnetic environments ITU/R Recommendation 500-4 Method for the subjective assessment of the quality of television pictures ITU/R Recommendation 562-3 1) Vocabulary – Chapter 161: Subjective assessment of sound quality - Section 10C - Audiofrequency characteristics of sound-broadcasting signals ——————— 1) Superseded by ITU Recommendation BS.1284-1 (12/03) “General methods for the subjective assessment of sound quality” This page deliberately left blank This page deliberately left blank British Standards Institution (BSI) BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions Information on standards British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards BSI provides a wide range of information on national, European and international standards through its Library Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: info@bsigroup.com Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: membership@bsigroup.com Information regarding online access to British Standards via British Standards Online can be found at www.bsigroup.com/BSOL Further information about BSI is available on the BSI website at www.bsigroup.com Buying standards Orders for all BSI, international and foreign standards publications should be addressed to BSI Customer Services Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 Email: orders@bsigroup.com You may also buy directly using a debit/credit card from the BSI Shop on the website www.bsigroup.com/shop In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained Details and advice can be obtained from the Copyright & Licensing Manager Tel: +44 (0)20 8996 7070 Email: copyright@bsigroup.com BSI Group Headquarters 389 Chiswick High Road London W4 4AL UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 www.bsigroup.com/standards raising standards worldwide™