... CB tested action: Open/Close of CB’s contacts, DC motor rotation for CB spring stretch.-Universal sensor clamp, suitable for ... form, bouncing amplitude, bounce ,over-travel,-Be able to test circuit breaker mechanical characteristics such as asynchronism, opening & closing speed, opening & ... , 1% reading±0.02m/s-Speed resolution, 0.01 m/s-Travel measurement range, 0~999.99mm-Travel precision, 0 ...