Magnetic field coil generates up to 1200A/m for EMC emission and immunity testing
July 05, 2012 // Julien Happich
Designed for EMC emission and immunity testing, the INA 703 magnetic field coil from Teseq generates fields up to 1200 A/m during magnetic field testing.
It is designed for testing to IEC 61000-4-8 (supply frequency magnetic fields), IEC 61000-4-9 (pulsed magnetic fields) and IEC 61000-4-10 (oscillatory magnetic fields) standards. By using a multi-turn (37 turn) configuration, the INA 703 is able to generate higher field levels of up to 1000 A/m using a programmable power source rated for ≥ 30 A like the Teseq ProfLine Conducted Immunity Test Systems. This enables testing with a current THD (total harmonic distortion) of <8%, as required by IEC 61000-4-8, that can only be met with a low distortion sine wave from a programmable AC source.
Another advantage of using a programmable power source is that various supply frequencies can be tested, not only 50Hz and 60Hz as requested by IEC 61000-4-8, but also DC and 16.7 Hz as required by some railway standards (EN 50121-4). Together with a TESEQ NSG 1007 source, INA 703 is able to generate fields with frequencies from DC to 400 Hz in 0.1 Hz resolution steps.
Taps at turns one and five provide increased accuracy when generating low amplitude fields. The required coil drive voltage is increased by reducing the turns-ratio of the coil. This establishes a suitable input voltage range that allows good regulation of the test level amplitude. With its U-shaped rigid aluminium base and wheels, the INA 703 is easily and quickly positioned next to or around the EUT. The coil size is 1x1m and has a homogeneous field volume of 60x60x50cm. The INA 703 takes a maximum continuous supply frequency current of 10A, a maximum short term supply frequency current of 35A for three seconds, a maximum continuous supply frequency field strength of 330A/m and a maximum short term supply frequency field strength of 1100A/m for three seconds. The unit has a maximum pulsed current of 1500 A (8/20 µs wave) and a maximum pulsed field strength of 1200 A/m.
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