EN 50366-2003 pdf download.Household and similar electrical appliances — Electromagnetic fields — Methods for evaluation and measurement.
The value W shall not exceed 1. However. if this value is exceeded, the weighted result is multiplied by the relevant coupling factor ar,) given in Annex A. The result shall not exceed 1
4.2.4.3 Simplified test methods
Appliances that are constructed so that they can only produce magnetic fields at mains frequency and its harmonics need only be tested in the frequency range below 2 kHz.
Appliances are considered to meet the requirements of this standard when all the following conditions are fulfilled:
– the currents, including the harmonic currents, generating the magnetic fields are known:
— all harmonic currents with amplitudes higher than 10 % of the amplitude of the mains frequency decrease continuously over the frequency range;
— the magnetic flux density measured at mains frequency is less than 50 % of the reference level specified for the mains frequency:
the magnetic flux density measured during a broadband measurement over the frequency range, with the mains frequency suppressed, is less than 15 % of the reference level specified for the mains frequency.
NOTE An active notch biter a suitable means for suppressing the mains frequency.
Appliances that are constructed so that they only produce very weak magnetic fields, when the mains frequency is dominating, are considered to meet the requirements of this standard when all the following conditions are fulfilled:
— the currents, including the harmonic currents, generating the magnetic fields are known;
— all harmonic currents with amplitudes higher than 10 % of the amplitude of the mains frequency decrease continuously over the frequency range;
— the magnetic flux density measured over the whole frequency range is less than 30% of the reference level specified for the mains frequency.
4.3 Measurement uncertainty
4.3.1 Inaccuracies of measurement can give rise to errors in the calculated values of magnetic flux density and the weighted result. The total error on the final result shall not exceed 25 %.
NOTE The total measurement uncertainty can compnse aspects sudi as sensor position. operating conditions, no#se background or the signal exceeding the dynamic range of the measunng mstrument.
4.3.2 When the result has to be compared with a limit, the measurement uncertainty shal be implemented as follows:
— to establish whether an appliance produces only fields below the limit, the measurement
uncertainty has to be added to the result and the sum has to be compared with the limit; NOTE 1 This applies for measurements carned out by the manufacturer,
— to establish whether an appliance produces fields over the limit, the measurement uncertainty has to be subtracted from the result and the difference has to be compared with the limit.
NOTE 2 This applies for measurements carried out by authontes for market surveillance purposes.
5 Test report
The test report shall include at least the following items:
— Identification of the appliance;
— rated voltage of the appliance;
— the measuring method;
— measuring distance, sensor locations and operating conditions, unless specified in Annex A;
– the maximum magnetic flux density, weighted with the coupling factor, if applicable.
6 Compliance criteria
Appliances are deemed to comply with the basic restriction if the reference levels are not exceeded (see Annex B).
It a value exceeds the reference level, the coupling factor can be taken into account to show compliance with the basic restriction. The coupling factor has been determined to cover the worst case for the same type of appliances.
If necessary. the coupling factor can be recalculated in accordance with Annex C. This procedure has to be used for appliances not listed in Table A.1. An example for the determination of the coupling factor is given in Annex D.
If the value still exceeds the reference level, this does not necessarily mean that the basic restriction is exceeded. Calculation methods can be used to verify whether the basic restriction is fulfilled (see Annex F, under consideration).
Annex A
(normative)
Test conditions for the measurement of magnetic flux density
A.1 General
A.1.1 The measurements are carried out under the conditions specified in Table A.11 the appliance being positioned as in normal use. If the appliance is not listed in Table Al, the measurement is made with the appliance operating as specified for normal operation in the EN 60335 series, the magnetic flux density being measured at operator distance around the appliance.
A.1.2 The wnning-in time is not specified but prior to testing, the appliance is operated for a sufficient period to ensure that the conditions of operation are typical of those during normal use.
A.1.3 The appliance is supplied at rated voltage and rated frequency, and operated as in normal use. It the rating includes 50 Hz, it is tested at 50 Hz.EN 50366-2003 pdf download.