Digital processor has program circuit to periodically read and square the digital representation at a given rate, register for summing a number N of square digital representations to give a summed value, and an algorithm for periodically dividing the summed value by the number N to provide a quotient and then taking {HEAD ~ the square root} of {TAIL ~ said quotient} to thereby digitally construct rms signal representing the root mean square of the weld current 
Digital processor has program circuit to periodically read and square the digital representation at a given rate , register for summing a number N of square digital representations to give a summed value , and an algorithm for periodically dividing the summed value by the number N to provide a quotient and then taking { HEAD ~ the square root } of { TAIL ~ said quotient } to thereby digitally construct rms signal representing the root mean square of the weld current
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