To improve the meshing quality and the performance of the driving mechanism in spiral bevel and hypoid gears

an approach of a fixed frequency clock signal to subdivide the pulse of angular displacement sensor was proposed

and the transmission error（T.E.） measurement model was established.Based on the datum subsampling for the synchronous time interval

the sequence signals of T.E.in time-domain were reconstructed

and then the spectrum analyses were achieved.Finally

the experiment platform for transmission error measurement was constructed

and the accuracy of T.E.was verified by the experiments of hypoid gears meshing.The results of the experiments show that the velocity approach will provide the experimental basis to the processing or modification in spiral bevel gears design or hypoid gears design

and has broad application prospects.