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AC magnetic fields up to 3 kHz can be measured directly using a modified high frequency fluxgate magnetometer. The amorphous metal ring core sensor was excited at 15 kHz and in short circuited output mode has a –3dB bandwith of at least 2 kHz. The total RMS noise level is 93 pT (64 mHz to 3 kHz), and the noise power density decreases as 1/f over the entire frequency band.
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Primdahl et al. (1994) studied this question.
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