AS NZS 62233:2021 pdf free.Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure (IEC 62233:2005 (ED. 1.0) MOD).
5.3 Measuring distances, positions and operating mode
The measuring distances, sensor locations and operating conditions are specified in Annex A.
The configuration and mode of operation during measurement shall be noted in the test report.
5.4 Magnetic field sensor
Measurement values of flux density are averaged over an area of 100 cm2 in each direction. The reference sensor consist of three mutually perpendicular concentric coils with a measuring area of 100 cm2 ± 5 cm2 to provide isotropic sensitivity. The outside diameter of the reference sensor shall not exceed 13 cm.
For the determination of coupling factors, as specified in Annex C, an isotropic sensor having a measuring area of 3 cm2 ± 0,3 cm2 is used.
NOTE 1 It is permissible to use a single direction sensor (not isotropic) in combination with an appropriate summation method.
NOTE 2 The final value of the magnetic flux density is the vector addition of the values measured in each direction. This ensures that the measured value is independent of the direction of the magnetic field vector.
5.5 Measuring procedures for magnetic fields
5.5.1 General
The measuring signal shall be evaluated dependent on the frequency. Taking independent field sources into account, the highest measured value shall be taken.
Transient magnetic fields with a duration of less than 200 ms, e.g. during switching events, are disregarded.
If a switching action occurs during the measurements, the measurement has to be repeated.
The measuring equipment is to have a maximum noise level of 5 % of the limit value. Any measured value below the maximum noise level is disregarded.
The background level is to be less than 5 % of the limit value.
The response time for the measuring equipment to reach 90 % of the final value is not to exceed 1 s.
The magnetic flux density is determined by using an averaging time of 1 s.
Shorter sampling times may be used if the source is shown to be constant over a period greater than 1 s for 10 Hz — 400 kHz signals.AS NZS 62233 pdf download.