▲ Features 1. simulation elevator governor, stability tester detects transmission speed, acceleration condition. 2. Tester simultaneous measurement of velocity measurement accuracy, calibration tester. 3. Set the electrical contact switching speed, the output electrical contact switching signal to the accuracy of the speed calibration value tester records. 4. Set the mechanical switching speed, the output of mechanical switching signal to the accuracy of the speed calibration value tester records. ▲ Specifications: 1. Speed ??measuring range: 0 ~ 20.00 m / s 2. Speed ??measurement resolution: 0.00 1m / s 3. Acceleration measurement range: 0 ~ 99.99 cm / s2 4. acceleration measurement resolution: 0.01 cm / s2 5. Measurement accuracy: 3 × 10-3 6. crystal oscillator frequency accuracy: 1 × 10-4