A practical measurement method and experimental system of the transmission error measurement for1 worm gear pair is presented.In order to satisfy the requirement of high-speed data acquisition and real-time transport

this system use advanced technology such as FPGA、USB2.0 to make sure of high measurement precision and good repeatability.A precision automatic detection and repeatability measurement method with qualitative mechanic phase-shifting technology is also presented

the system precision can reach ±0.136% and repeatability can reach 0.85″ that can meet the test standard requirement of Level I worm gear pair.