FIELD: instruments, computer engineering. SUBSTANCE: device has power detector 1, counters 2, 4, 17, 22, 28, 31, memory units 5, 26, 35, accumulating adder 6, register 8, subtraction units 10, 37, first, second and third read-only memory units 11, 23, 34, rectangular pulse oscillator 16, switches 3 and 18, commutator 38, flip-flop 30, multiple-input NAND gate 24, NAND gate 32, AND gates 19, 20, 25, NOT gates 33, 39, univibrators 7, 9, 13, 14, 15, 21, 27, 29. Device provides possibility to output families of histograms of variable and constant constituents of load power, which is averaged over various sliding time intervals. EFFECT: increased functional capabilities, increased precision. 6 dwg, 1 tbl
