FGSensors FG-3+ Sensor

The FGM-X series of devices are very high sensitivity magnetic field sensors operating in the 50 microtesla range ( 0.5 oersted). They are simple essentially three terminal devices operating from a single +5 volt supply the connections being ground +5v and output. The output is a robust 5 volt rectangular pulse whose period is directly proportional to the field strength (giving a frequency which varies inversely with the field) making it very easy to interface to a computer or micro controller. The typical period swing for the full range of an FGM-3 is from 8.5 s to 25 s (~120 KHz to ~50KHz) a clear indication of its high sensitivity. Unlike Hall Effect field sensors which are virtually unusable in this range because of their large temperature sensitivity the FGM-series has a very low temperature coefficient. Since the lowest effective Nyquist sampling rate is ~50 KHz appropriate filtering can provide an AC field bandwidth from DC to ~20kHz.