Does any one know what possible effects EMI from high voltage power lines would have on industrial equipment such as a PLC, or DC devices such as strain gage/loadcell amplifiers. The ambient milli gauss from the power lines has been measured at approx. 47 mG, under the lines to about 10 mG @ 30 metres. Line frequency is 50 Hz. If there are potential effects, how can we minimise them?
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