... 24V ~ + 24V YD-10 Revolution Speed Tester A. OverviewYD-10 Revolution Speed Check Table is our newest development with ... calibration of speed, zero speed, reversal protection and overspeed protection of various speed instruments, sensors and speed measurement system, ... positive supply voltage regulator / negative supply voltage regulator9. Speed gear B. Performance indexPower input: 220Vac, 50Hz; ...