DIGITAL COUNTER OF CRITICAL VOLTAGE SURGES AND DIPS AND OF TOTAL TIME OF ELECTRICAL EQUIPMENT FAILURE Russian patent published in 2002 - IPC

FIELD: data-processing computer engineering. SUBSTANCE: counter designed to count voltage surges and dips whose duration is in excess of preset critical values and to compute total time of electrical equipment failure at transient voltage across supply mains has ac-to-dc voltage converter, subtraction unit, reference-voltage source, inverter, n comparators, where n is number of voltage surge or dip amplitude modulus analysis levels, n variable- ratio frequency dividers, n frequency division ratio code setting devices, n D flip-flops, one-shot multivibrator, AND gate, two OR gates, two counters, SR flip-flops, and square-pulse generator. EFFECT: simplified design, facilitated servicing, enlarged functional capabilities of counter. 3 cl, 6 dwg