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[philvr]

I've been experimenting with a couple of Hall Effect Current Sensors and using them to measure large DC currents (up to 60A). The devices are the CSLA1CD by Honeywell. I've had some success but the device has developed an offset! Out of two units one now produces 5.8V when zero current flows and the other 6.3V! Originally they both produced 6V! My question is has anyone here experience of using Hall Effect Current Sensors? Can they become permanently magnetised if exposed to magnetic fields from associated high current DC cables and hence produce an output that is out of specification? I can not think of any other reason for them to develop an offset but I am new to these devices so am hoping someone reading this can offer advice. regards Philvr