Abstract In JJF1737-2019,It recommends that in order to realize ETU sample could be tested into magnetic field immunity test with (1~1200)A/m by using a square coils with current generator. With the numbers of square coil turns of N=1~3,made by the majority of the EMC manufacturers, and the output peak current of the current generator of 400 A ~ 1200 A, the expected goal could be accomplished, of which the reason is mainly because of the square with a single turn or single layer winding coil, the coil Magnetic induction intensity is consistent with the theoretical value and the measured values, but with numbers of turns or multi-layer winding, due to the effect of stress of the square’s four right angles, technically, it is difficult to ensure that the tightness of the winding wires is consistent with that of the square mold, also practices shows that the theoretical value of Magnetic induction intensity of the multi-turn square coil is far away from the measured value [1].Therefore, this topic designs an octagonal replace square coil magnetic field , by the theoretical analysis and practical tests, validating that the theoretical value of intensity of octagonal coil magnetic field consistent with the test value, with the design of octagonal field coil with numbers of turns , under the lower current generator output capacity, octagonal coil of the Magnetic induction intensity can still achieve (1-1200) the A/m, and square coil magnetic field uniformity, which is verified by 2%.
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Received: 27 October 2020
Published: 24 May 2021
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