FIELD: engines. SUBSTANCE: two frequency-to-voltage converters 9, 10, two comparators 11, 12, OR gate 13, XOR gate 14, delay unit 15 and three AND gates 18, 19, 20 are introduced to accomplish the goal of invention. EFFECT: increased fidelity of testing due to functional testing of operating order of gauges (choppers and speed counters), failure detection and disabling failed element during minimal time after detection failure. 1 dwg
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