SIST EN 61000-4-10:1997

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Elektromagnetna združljivost (EMC) - 4-10. del: Preskusne in merilne tehnike - Preskus odpornosti proti magnetnemu polju dušenega nihanja (IEC 61000-4-10:1993)Elektromagnetische Verträglichkeit (EMV) - Teil 4-10: Prüf- und Meßverfahren - Prüfung der Störfestigkeit gegen gedämpft schwingende MagnetfelderCompatibilité électromagnétique (CEM) - Partie 4-10: Techniques d'essai et de mesure - Essai d'immunité au champ magnétique oscillatoire amortiElectromagnetic compatibility (EMC) - Part 4-10: Testing and measurement techniques - Damped oscillatory magnetic field immunity test33.100.20ImunostImmunityICS:Ta slovenski standard je istoveten z:EN 61000-4-10:1993SIST EN 61000-4-10:1997en01-marec-1997SIST EN 61000-4-10:1997SLOVENSKI
STANDARD



SIST EN 61000-4-10:1997



SIST EN 61000-4-10:1997



SIST EN 61000-4-10:1997



SIST EN 61000-4-10:1997



SIST EN 61000-4-10:1997



NORMECEIINTERNATIONALEIECINTERNATIONAL 1000-4-10STAN DARDPremière éditionFirst edition1993-06Compatibilité électromagnétique (CEM) -Partie 4:Techniques d'essai et de mesure -Section 10: Essai d'immunité auchamp magnétique oscillatoire amortiPublication fondamentale en CEMElectromagnetic compatibility (EMC) -Part 4:Testing and measurement techniques -Section 10: Damped oscillatory magnetic fieldimmunity testBasic EMC Publication© CEI 1993 Droits de reproduction réservés — Copyright — all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun pro-cédé, électronique ou mécanique, y compris la photocopie etles microfilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized inany form or by any means, electronic or mechanical,including photocopying and microfilm, without permissionin writing from the publisher.Bureau Central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève, SuisseIEC•Commission Electrotechnique Internationale CODE PRIXInternational Electrotechnical Commission PRICE CODEMenutynaponKae 3neKTpoTexHHVecnan HOMHCCHA• Pour prix, voir catalogue en vigueurFor price, see current catalogueSIST EN 61000-4-10:1997



1000-4-10 © IEC :1993- 3 -CONTENTSPageFOREWORD 7INTRODUCTION
9Clause1Scope
112Normative references
113General
134Definitions
134.1EUT
134.2Induction coil
134.3Induction coil factor
134.4 Immersion method
134.5 Proximity method 134.6 Ground (reference) plane
134.7 Decoupling network, back filter
154.8 Burst
155Test levels
156Test equipment
156.1Test generator
176.2Induction coil
196.3 Test and auxiliary instrumentation
237Test set-up
237.1Ground (reference) plane
257.2 Equipment under test
257.3 Test generator
257.4Induction coil . . 258Test procedure
278.1Laboratory reference conditions
278.2 Carrying out the test
279Test results and test report
31AnnexesA - Induction coil calibration method
39B- Characteristics of the induction coils
41C - Selection of the test levels 53D- Information on magnetic field strength
57E- Damped oscillatory magnetic field frequency
59SIST EN 61000-4-10:1997



1000-4-10 © IEC :1993- 5 -FiguresPage1 Example of application of the test field by the immersion method
332 Current waveform of the test generator for dampedoscillatory magnetic field (sinusoid wave)
333 Schematic circuit of the test generator for damped oscillatory magnetic field
334 Example of test set-up for table-top equipment
355 Example of test set-up for floor-standing equipment
356 Example of investigation of susceptibility to magnetic fieldby the proximity method
377 Illustration of Helmholtz coils
37B.1 - Characteristics of the field generated by a square induction coil (1 m side)in its plane
45B.2 - 3 dB area of the field generated by a square induction coil (1 m side) in its plane45B.3 - 3 dB area of the field generated by a square induction coil(1 m side) in the mean orthogonal plane(component orthogonal to the plane of the coil)
47B.4 - 3 dB area of the field generated by two square inductioncoils (1 m side) 0,6 m spaced, in the mean orthogonalplane (component orthogonal to the plane of the coils)
47B.5 - 3 dB area of the field generated by two square inductioncoils (1 m side) 0,8 m spaced, in the mean orthogonalplane (component orthogonal to the plane of the coils)
49B.6 - 3 dB area of the field generated by a rectangular inductioncoil (1 m x 2,6 m) in its plane
49B.7 - 3 dB area of the field generated by a rectangular inductioncoil (1 m x 2,6 m) in its plane (ground plane as a side of the induction coil)
51B.8 - 3 dB area of the field generated by a rectangular inductioncoil (1 m x 2,6 m) with ground plane, in the meanorthogonal plane (component orthogonal to the plane of the coil)
51SIST EN 61000-4-10:1997



DIS77B(CO)9Report on Voting77B(CO)151000-4-10 © IEC :1993- 7 -INTERNATIONAL ELECTROTECHNICAL COMMISSIONELECTROMAGNETIC COMPATIBILITY (EMC) —Part 4: Testing and measurement techniques —Section 10: Damped oscillatory magnetic field immunity testBasic EMC PublicationFOREWORD1)The IEC (International Electrotechnical Commission) is a world-wide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promote interna-tional cooperation on all questions concerning standardization in the electrical and electronic fields. To this endand in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted totechnical committees; any IEC National Committee interested in the subject dealt with may participate in thispreparatory work. International, governmental and non-governmental organizations liaising with the IEC alsoparticipate in this preparation. The IEC collaborates closely with the International Organization (ISO) in accordancewith conditions determined by agreement between the two organizations.2)The formal decisions or agreements of IEC on technical matters, prepared by technical committees on which allNational Committees having a special interest therein are represented, express, as nearly as possible, aninternational consensus of opinion on the subjects dealt with.3)They have the form of recommendations for international use published in the for of standards, technical reportsor guides and they are accepted by the National Committees in that sense.4)In order to promote international unification, the IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national or regional standards. Any divergencebetween the IEC Standards and the corresponding national or regional standards shall be clearly indicated in thelatter.International Standard IEC 1000-4-10 has been prepared by sub-committee 77B: Highfrequency phenomena, of IEC technical committee 77: Electromagnetic compatibility.It forms section 10 of part 4 of IEC 1000. It has the status of a basic EMC publication inaccordance with IEC guide 107.The text of this standard is based on the following documents:Full information on the voting for the approval of this standard can be found in the Voting Reportindicated in the above table.Annexes A and B form an integral part of this standard.Annexes C, D and E are for information only.SIST EN 61000-4-10:1997



1000-4-10 © IEC :19939INTRODUCTIONThis standard is part of the IEC 1000 series, according to the following structure:Part 1: GeneralGeneral considerations (introduction, fundamental principles)Definitions, terminologyPart 2: EnvironmentDescription of the environmentClassification of the environmentCompatibility levelsPart 3: LimitsEmission limitsImmunity limits (in so far they do not fall under the responsibility of the product commit-tees)Part 4: Testing and measurement techniquesMeasurement techniquesTesting techniquesPart 5: Installation and mitigation guidelinesInstallation guidelinesMitigation methods and devicesPart 9: MiscellaneousEach part is further subdivided into sections which are to be published either as internationalstandards or as technical reports.These standards and reports will be published in chronological order and numbered accord-ingly.This part is an international standard which gives immunity requirements and test proceduresrelated to "damped oscillatory magnetic field".SIST EN 61000-4-10:1997



1000-4-10 © I EC :1993- 11 -ELECTROMAGNETIC COMPATIBILITY (EMC) —Part 4: Testing and measurement techniques —Section 10 : Damped oscillatory magnetic field immunity testBasic EMC Publication1 ScopeThis international standard relates to the immunity requirements of equipment, only underoperational conditions, to damped oscillatory magnetic disturbances related to medium voltageand high voltage sub-stations.The applicability of this standard to equipment installed in different locations is determined bythe presence of the phenomenon, as specified in clause 3.This standard does not consider disturbances due to capacitive or inductive coupling in cablesor other parts of the field installation.Other IEC standards dealing with conducted disturbances cover these aspects.The object of this standard is to establish a common and reproducible basis for evaluating theperformance of electrical and electronic equipment for medium voltage and high voltagesub-stations when subjected to damped oscillatory magnetic fields.The standard has the object to defines:- recommended test levels;- test equipment;- test set-up;- test procedure.2 Normative referencesThe following normative documents contain provisions which, through reference in this text,constitute provisions of this section of IEC 1000-4. At the time of publication, the editionsindicated were valid. All normative documents are subject to revision, and parties to agree-ments based on this section of IEC 1000-4 are encouraged to investigate the possibility ofapplying the most recent editions of the normative documents indicated below. Members ofIEC and ISO maintain registers of currently valid International Standards.IEC 68-1: 1988, Environmental testing - Part 1: General and guidance.SIST EN 61000-4-10:1997



1000-4-10 © IEC :1993- 13 -3 GeneralThe magnetic fields to which equipment is subjected may influence the reliable operation ofequipment and systems.The following tests are intended to demonstrate the immunity of equipment when subjected todamped oscillatory magnetic field related to the specific location and installation condition ofthe equipment (e.g. proximity of equipment to the disturbance source).The damped oscillatory magnetic field is generated by the switching of H.V. bus-bars byisolators.The test is mainly applicable to electronic equipment to be installed in H.V. sub-stations.Possible other applications may be considered by the product committees.The test field consists of a damped oscillatory wave (see figure 2) whose characteristics aregiven in 6.1.1.Information on the oscillation frequency is given in annex E.4 DefinitionsThe following definitions and terms are used in this standard and apply to the restricted fieldof magnetic disturbances; not all of them are included in IEV(50)161.4.1EUTEquipment under test4.2Induction coil4.3Induction coil factor4.4 Immersion method4.5 Proximity methodConductor loop of defined shape and dimensions,in which flows a current, generating a magnetic fieldof defined constancy in its plane and in the enclosedvolume.Ratio between the magnetic field strength gener-ated by an induction coil of given dimensions andthe corresponding current value; the field is thatmeasured at the centre of the coil plane, without theEUT.Method of application of the magnetic field to theEUT, which is placed in the centre of an inductioncoil (figure 1).Method of application of the magnetic field to theEUT, where a small induction coil is moved alongthe side of the EUT in order to detect particularlysensitive areas.4.6 Ground (reference) plane (GRP) A flat conductive surface whose potential is used asa common reference for the magnetic field gener-ator and the auxiliary equipment (the ground planecan be used to close the loop of the induction coil,as in figure 5). (IEV 161-04-36, modified).SIST EN 61000-4-10:1997



1000-4-10 © IEC :19934.7Decoupling network, back filter4.8Burst5 Test levels- 15 -Electrical circuit intended to avoid reciprocal influ-ence with other equipment not submitted to themagnetic field test.A sequence of a limited number of distinct pulses oran oscillation of limited duration (IEV 161-02-07).The preferential range of test levels is given in table 1.The magnetic field strength is expressed in A/m; 1 A/m corresponds to a free space inductionof 1,26 µT.Table 1 - Test levelsLevelDamped oscillatory magnetic field strengthA/m (peak)1n.a. 2)2n.a. 2)3104305100x 1)specialNOTES1 - "x" is an open level. This level, as well the duration of the test, can be given inthe product specification.2 - "n.a." = not applicableInformation on the selection of the test levels is given in annex C.Information on actual levels is given in annex D.The duration of the test is 2 s.6 Test equipmentThe test magnetic field is obtained by a current flowing in an induction coil; the application ofthe test field to the EUT is by the immersion method.An example of application of the immersion method is given in figure 1.The test equipment includes the current source (test generator), the induction coil and auxiliarytest instrumentation.SIST EN 61000-4-10:1997



1000-4-10 © I EC :1993- 17 -6.1 Test generatorThe generator, with the output waveform corresponding to the test magnetic field, shall beable to deliver the required current in the induction coils specified in 6.2.The generator power capability shall therefore be dimensioned by taking into account the coilimpedance; the inductance may range from 2,5 µH for the 1 m standard coil, to several µH(e.g. 6 pH) for a rectangular induction coil (1 m x 2,6 m, see 6.2).The specifications of the generator are:- current capability, determined by the maximum selected test level and induction coil factor(see 6.2.2 and annex A), ranging from 0,87 (1 m standard coil for testing table-top orsmall equipment to 0,66 (rectangular induction coil, 1 m x 2,6 m, for testing floor standingor large equipment);- operability in short circuit condition;- low output terminal connected to the earth terminal (for connection to the safety earth of thelaboratory);- precautions to prevent the emission of large disturbances that may be. injected in the powersupply network or may influence the test results.The characteristics and performances of the current source or test generator for the fieldconsidered in this standard are given in 6.1.1.6.1.1 Characteristics and performances of the test generatorThe test generator is a repetitive damped sinusoid current generator with characteristics asfollows:SpecificationsOscillation frequency:Decay rate:Repetition rate:Test duration:Output current range:0,1 MHz and 1 MHz ± 10 %50 % of the peak value after 3 to 6 cyclesat least 40 transients/s at 0,1 MHz, 400 transients/s at 1 MHz2 s (+ 10 %, - 0 %) or continuousfrom 10 A to 100 A, divided by the coil factorNOTE - The output current range for the standard coil is from 12 A to 120 A.The waveform of the output current is given in figure 2.The schematic circuit of the generator is given in figure 3.6.1.2 Verification of the characteristics of the test generatorIn order to compare the results for different test generators, the essential characteristics of theoutput current parameters shall be verified.The output current shall be verified with the generator connected to the standard induction coilspecified in 6.2.1. a); the connection shall be realized by twisted conductors or coaxial cableof up to 3 m length and suitable cross-section.The emission of disturbances by the generator shall be verified (see 6.1).SIST EN 61000-4-10:1997



1000-4-10 © I EC :1993- 19 -The characteristics to be verified are:- output current peak value;- damping;- frequency of oscillation;- repetition rate.The verifications shall be carried out with a current probe and oscilloscope or other equivalentmeasurement instrumentation with 10 MHz minimum bandwidth.The accuracy of the measurements shall be ± 10%.6.2 Induction coil6.2.1 Characteristics of the induction coilThe induction coil, connected to the test generator previously defined (see 6.1.1), shallgenerate a field strength corresponding to the selected test level and the defined homogeneity.The induction coil shall be made of copper, aluminium or any conductive non-magneticmaterial, of such cross-section and mechanical arrangement as to facilitate its stable position-ing during the tests.The coil shall be "single turn" and have a suitable current capability, as necessary for theselected test level.The induction coil shall be adequately dimensioned to surround the EUT (three orthogonalpositions).Depending on the size of the EUT, induction coils of different dimensions may be used.The dimensions recommended below are suitable for the generation of magnetic field over thewhole volume of the EUT's (table-top equipment or floor-standing equipment), with an accept-able variation of ± 3 dB.The characteristics of induction coils in respect of the magnetic field distribution are given inannex B.a) Induction coil for table-top equipmentThe induction coil of standard dimensions for testing small equipment (e.g. computermonitors, watthour meters, transmitters for process control, etc.) has a square (or circular)form with 1 m side (or diameter), made of a conductor of relatively small cross-section.The test volume of the standard square coil is 0,6 m x 0,6 m x 0,5 m (height).A double coil of standard size (Helmholtz coil) could be used in order to obtain a fieldhomogeneity better than 3 dB or for testing larger EUT's.The double coil (Helmholtz coil) shall comprise of two or more series of turns, properlyspaced (see figure 7, figure B.4, figure B.5).The test volume of a double standard size coil, 0,8 m spaced, for a 3 dB homogeneity is0,6 m x 0,6 m x 1 m (height).For example, the Helmholtz coils, for a 0,2 dB inhomogeneity, have dimensions andseparation distances as given in figure 7.SIST EN 61000-4-10:1997



1000-4-10 ©IEC :1993- 21 -b) Induction coil for floor-standing equipmentInduction coils shall be made according to the dimensions of the EUT and the differentfield polarizations.The coil shall be able to envelop the EUT; the coil dimensions shall be such as to give aminimum distance of coil conductors to EUT walls equal to 1/3 of the dimension of theEUT considered.The coils shall be made of conductors of relatively small cross-section.NOTE - Due to the possible large dimensions of EUT's, the coils may be made of "C" or "T" sections in order tohave sufficient mechanical rigidity.The test volume is determined by the testing area of the coil (60 % x 60 % of each side)multiplied by a depth corresponding to 50 % of the shorter side of the coil.6.2.2 Calibration of the induction coil, coil factorIn order to make it possible to compare the test results from different test equipment, theinduction coils shall be calibrated in their operating condition, before conducting the test(without the EUT, in free space condition).An induction coil of the correct dimensions for the EUT dimensions, shall be positioned at 1 mminimum distance from the wall of the laboratory and any magnetic material, by using insulatingsupports, and shall be connected to the test generator as prescribed in 6.1.2.Appropriate magnetic field sensors (B.W. > 10 MHz), with dynamics and frequency responsein accordance with the oscillatory field, shall be used to verify the magnetic field strengthgenerated by the induction coil.The field sensor shall be positioned at the centre of the induction coil (without the EUT) andwith suitable orientation to detect the maximum value of the field.The current in the induction coil shall be adjusted to obtain the field strength specified by thetest level.The calibration shall be carried out at power frequency: the current value that generates agiven field strength shall be used for the damped oscillatory test of the present standard.The calibration procedure shall be carried out on the test generator and induction coils.The coil factor is determined (and verified) by the above procedure.The coil factor gives the current value to be injected in the coil to obtain the required testmagnetic field (H/I).Information on the measurement of the test magnetic field is given in annex A.SIST EN 61000-4-10:1997



1000-4-10 © IEC :1993- 23 -6.3 Test and auxiliary instrumentation6.3.1 Test instrumentationThe test instrumentation includes:- current measuring system (sensors and instrument) for setting and measuring the currentinjected in the induction coil;- termination networks, back filters, etc., on power supply, control and signal lines.The termination network gives a defined impedance of 50 SZ to earth for all the external circuitsconnected to the EUT terminals. It may be represented by the line impedance stabilizationnetwork for power supply circuits, coupling/decoupling network, or resistor-capacitor series forinput/output control and signal circuits. These networks shall be described in the test plan.The termination networks, back filters, etc. shall be compatible with the operating signals.Back filters shall be used in the connections to the simulator (see 6.3.2).The current measuring system is a calibrated current probe or shunt; the transient currentmeasurement instrumentation shall have a bandwidth up to 10 MHz.The accuracy of the measurement instrumentation shall be ± 10 %.6.3.2 Auxiliary instrumentationThe auxiliary instrumentation comprises a simulator and any other instrument necessary forthe operation and verification of the EUT functional specifications.7 Test set-upThe test set-up comprises the following components:- ground (reference) plane (GRP);- equipment under test (EUT);- test generator;- induction coil;termination network, back filter.Precautions shall be taken if the test magnetic field may interfere with the test instrumentationand other sensitive equipment in the vicinity of the test set-up.Examples of test set-ups are given in the following figures:Figure 4: Example of test set-up for table-top equipmentFigure 5: Example of test set-up for floor-standing equipmentSIST EN 61000-4-10:1997



1000-4-10 © I EC :1993- 25 -7.1 Ground (reference) planeThe ground plane (GRP) shall be placed in the laboratory; the EUT and auxiliary test equipmentshall be placed on it and connected to it.The ground plane shall be a non magnetic metal sheet (copper or aluminium) of 0,25 mmthickness; other metals may be used but in this case they shall have 0,65 mm minimumthickness.The minimum size of the ground plane is 1 m x 1 m.The final size depends on the dimensions of the EUT.The ground plane shall be connected to the safety earth system of the laboratory.7.2 Equipment under testThe equipment is configured and connected to satisfy its functional requirements. It shall beplaced on the GRP with the interposition of a 0,1 m thickness insulating support (e.g. dry wood).The equipment cabinets shall be connected to the safety earth directly on the GRP withconnection of minimum length via the earth terminal of the EUT.The power supply, input and output circuits shall be connected to the sources of power supply,control and signals via the back filters.The cables supplied or recommended by the equipment manufacturer shall be used. Inabsence of any recommendation, unshielded cables shall be adopted, of a type appropriatefor the signals involved. All cables shall be exposed to the magnetic field for 1 m of their length.The back filters shall be inserted in the circuits at 1 m cable lengths from the EUT andconnected to the ground plane.The input and output circuits, to the simulator, shall be provided with back filters in order toprevent interference to that equipment.The communication lines (data lines) shall be connected to the EUT by the cables given in thetechnical specification or standard for this application. Each line in the proximity of the EUTshall be maintained at a distance of about 0,1 m from the GRP.7.3 Test generatorThe test generator shall be placed at less than 3 m distance from the induction coil.One terminal of the generator shall be connected to the ground plane.7.4 Induction coilThe induction coil, of the type specified in 6.2.1, shall enclose the EUT placed at its centre.Different induction coils may be selected for testing in the different orthogonal directions,according to the general criteria specified in 6.2.1 a) and b).SIST EN 61000-4-10:1997



1000-4-10 © IEC :1993- 27 -Induction coils used in the vertical position (horizontal polarization of the field) can be bonded(at the foot of one vertical conductor) directly to the ground plane, which represents the lowside of the coil, as a part of it. In this case, 0,1 m minimum distance from EUT to the groundplane is sufficient.The induction coil shall be connected to the test generator in the same way as for the calibrationprocedure specified in 6.2.2.The induction coil selected for the tests shall be specified in the test plan.8 Test procedureThe test procedure shall include:- verification of the laboratory reference conditions;- preliminary verification of the correct operation of the equipment;- carrying out the test;- evaluation of the test results.8.1 Laboratory reference conditionsIn order to minimize the effect of environmental parameters on the test results, the test shallbe carried out in climatic and electromagnetic reference conditions as specified in 8.1.1 and8.1.2.8.1.1 Climatic conditionsThe tests shall be carried out in standard climatic conditions in accordance with IEC 68-1:- temperature:15 °C to 35 °C- relative humidity:25°A to 75 %- atmospheric pressure:86 kPa to 106 kPaNOTE - Any other value may be given in the product specifications.8.1.2 Electromagnetic conditionsThe electromagnetic conditions of the laboratory shall be such to guarantee the correctoperation of the EUT in order not to influence the test results; otherwise, the tests shall becarried out in a Faraday cage.In particular, the electromagnetic field value of the laboratory shall be at least 20 dB lower thanthe selected test level.8.2 Carrying out the testThe test shall be carried out on the basis of a test plan including verification of the perform-ances of the EUT as defined in the technical specification.The power supply, signal and other functional electrical quantities shall be applied within theirrated range.SIST EN 61000-4-10:1997



1000-4-10 ©IEC :1993- 29 -If the actual operating signals are not available, they may be simulated.Preliminary verification of equipment performances shall be carried out prior to applying thetest magnetic field.The test magnetic field shall be applied by the immersion method to the EUT, previously set-upas specified in 7.2.The test level shall not exceed the product specification.NOTE - In order to detect the most susceptible side/positions of the EUT, mainly of a stationary type, the proximitymethod may be used for investigation purposes. This method is not to be used for certification. An example ofapplication of the test field by proximity method is given in figure 6.The test is performed by applying the damped oscillatory magnetic field for 2 s.The test shall be implemented at two frequencies, at least, in the range between 30 kHz and10 MHz. Preferably, it shall be made at 0,1 and 1 MHz. Any other test frequency in the range30 kHz and 10 MHz may be chosen by product committee or product specification; they shallbe recorded in the test plan.The test shall be made at repetition rate of at least 40 Hz for 0,1 MHz and at 400 Hz for the 1MHz wave. The repetition rate will be increased or decreased proportionally to the testfrequency.a)Table-top equipmentThe equipment shall be subjected to the test magnetic field by using the induction coil ofstandard dimensions (1 m x 1 m) specified in 6.2.1 a) and shown in figure 4.The induction coil shall then be rotated by 90° in order to expose the EUT to the test fieldwith different orientations.b)Floor-standing equipmentThe equipment shall be subjected to the test magnetic field by using induction coils ofsuitable dimensions as specified in 6.2.1 b); the test shall be repeated by moving andshifting the induction coils, in order to test the whole volume of the EUT for eachorthogonal direction.The test shall be repeated with the coil shifted to different positions along the side of theEUT, in steps corresponding to 50 % of the shortest side of the coil.NOTE - The moving of the induction coil in steps corresponding to 50 % of the shortest side of the coil givesoverlapping test fields.The induction coil shall then be rotated by 90° in order to expose the EUT to the test fieldwith different orientations and the same procedure.SIST EN 61000-4-10:1997



1000-4-10 © IEC 1993-31 -9 Test results and test reportThis clause gives a guide for the evaluation of the test results and for the test report, relatedto this standard.The variety and diversity of equipment and systems to be tested make the task of establishingthe effects of this test on equipment and systems difficult.The test results shall be classified on the basis of the operating conditions and the functionalspecifications of the equipment under test, as in the following, unless different specificationsare given by product committees or product specifications:1)normal performance within the specification limits;2)temporary degradation or loss of function or performance which is self-recoverable;3)temporary degradation or loss of function or performance which requires operator inter-vention or system reset;4)degradation or loss of function which is not recoverable due to damage of equipment(components) or software, or loss of data.Equipment shall not become dangerous or
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