AS NZS 61786.1:2021 – Measurement of DC magnetic, AC magneticand AC electric fields from 1 Hz to 100 kHzwith regard to exposure of human beingsPart 1: Requirements for measuring instruments (IEC61786-1:2013(ED.1.0) MOD)
AS NZS 61786.1:2021 – Measurement of DC magnetic, AC magneticand AC electric fields from 1 Hz to 100 kHzwith regard to exposure of human beingsPart 1: Requirements for measuring instruments (IEC61786-1:2013(ED.1.0) MOD).
Instrumentation intended for use in the vicinity of high-voltage equipment operating at power frequencies shall not be affected significantly by ambient electric fields as large as 20 kVIm. i.e. the influence of the electric field on the magnetic field reading shall be less than 0,2 pT. This immunity requirement may need to be increased for some extreme environments where electric fields as large as 100 kVlm may exist. e.g. near high-voltage transmis5ion line conductors.
Tests for immunity to power frequency electric fields may be performed using the parallel plates systems described in Clause A.2.
NOTE 1 The proximity cIted ol the instrument user can shield or enhance the electric field, depending on the geometry of the field and me location of the niagnethc field meter relative to the user. For influence of user diing el.ctric field test, see IEC 61756.2
b) Power frequency magnetic field
Instrumentation intended for use in the vicinity of high-voltage equipment operating at power frequencies shall not be affected significantly by ambient magnetic fields as large as 1 mT, i.e. the influence of the magnetic field on the electric field reading shall be less than 10 VIm. Instrumentation shall be tested in accordance with the methods described in
Tests for Immunity to power frequency magnetic fields may be performed using the Coil systems described In Clause Al.
c) Radiated electromagnetic fields
The operation of instrumentation shall not be affected by electromagnetic radiation for frequencies defined in IEC 61000-4-3 for an electric field of 3 VIm rms for frequencies between 80 MHz and 2 GHz, and 1 VIm rms for higher frequencies.
Testing of Instrumentation shall be In accord with the methods described In
NOTE 2 In EC 61OOO-4-3:2OO6A22O1O the frequency rang. is 80 MHz-6 GHz, intended to cover radiofrequency applications as bfo.dcastlng, radiocommunicatlon. GSU, Will. etc.
The operation of instrumentation shall not be affected by electromagnetic radiation between 150 kHz and 80 MHz. Tests shall be conducted according to the methods described in IEC 610004-8 at a voltage level of 3 V rms. The Instrumentation shall continue to operate normally during both of the above tests.
Battery-powered equipment (dimension <214) which has no connection(s) to the ground nor to any other (non-insulated) equipment, and which will not be used during battery charging, does not need to be tested according to IEC 61000-4-6. NOTE 3 The immunity requiremnts may need to be Increased unde, certain conditions, e.g. during measurements near radio-broadcasting antennas and moe.le telephones d) Immunity to transients Specifications for instrumentation connected to the mains in order to carry out measurements shall also be tested at the a.c. power port (interface of field meter with external power source or AC wall outlet) for compliance with IEC 61000-4-4 (electrical fast transient) for a peak voltage of 2 kV. A temporary degradation of performance during the test which is self-recoverable is acceptable. a) Electrostatic discharge (ESD) During most measurement applications, electrostatic discharges to or from the instrumentation are not anticipated. However, the connectors of the instrumentation shall be immune to a contact or discharge voltage of ai least 2 kV and tested in accordance with the methods described in IEC 6 1000-4-2. No degradation of performance shall occur. 5.9.2 Emissions a) Harmonic emissions The harmonic emissions of instrumentation with a power rating of 50 W or greater shall be restricted according to the requirements of IEC 6 1000-3-2 class A. 5.10 Crest factor The measuring system shall measure correctly the true rms value of the field, even when the crest factor of the magnetic field is 3. NOTE Many prnchcal fi.ld exhibit a large crest facto and the pesence of a large crest factor may lead to unwanted Caturahofl in the amplilier stages at the delectar 5.11 Durability The indicating meter and other system components shall be rug9ed enough to withstand vibration and shock resulting from transport, A carrying case is desirable. The instrumentation shall be compliant with EC 60721-3: storage class 1M2. transport class 2M3 and operation class 7M3. 5.12 Weight The weight of the Instrumentation should be provided. The weight of portable Instrumentation should be kept as low as Is practical to permit hand-held operation under restrictive conditions, e.g. in some industrial environments. The weight of free-body electric field meters should be kept as low as is practical so that it can be held conveniently by hand with an Insulating perch as long as 2 m.