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Arcadia uses two one-axis low frequency AC electromagnetic field meters, that measure the surrounding AC field from lim(x->0)x to ~1,500 hertz. They are actually factory calibrated array style electrosensors that I have modified for use with the system. The output from three different stages of the electrosensor's circuitry passes through my own design of filtering, amplifying and biasing circuitry. The result is a beautiful analog signal of the surrounding AC magnetic field, showing the frequency of the surrounding field, biased to the field strength. These meters will measure between 0 and 28.1 milligauss field strength, with resolution to 31.79 microgauss.
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