How to measure the chain specification model?

Regarding the chain specification model measurement method Specific introduction: 1. Measurement of the center of the two sprocketes: The front chain is cleaned to remove the gap of the entire chain to exert a certain degree of pulling tension state on the chain. 2. Measurement load: When measured, it is necessary to measure the error as much as possible at the place 6-10. The specified measuring load is applied on the chain so that the upper and lower sides are tight, and the chain should ensure that normal tooth is combined. 3. Measurement number: The inner L1 and outer L2 size of the roller between the measurement section find the elongation length of the chain of the chain.