FIELD: instruments, computer engineering, in particular, continuous monitoring of current values and histogram of deviations of voltage level from standard level in industrial power supply lines. SUBSTANCE: device has alternating-to-direct voltage converter, null-balance device, absolute value generator, analog-to-digital converter, four counters, multiple-position and two-position switches, encoder, commutator, memory unit, gate, three NAND gates, access pulse generator, clock oscillator, two indicators, two flip-flops, decoder, NOT gate. EFFECT: increased functional capabilities, increased reliability of operations, facilitated use. 4 dwg
