The testing method classification for mechanical transmission error is briefly introduced

the excellence of digital counting method is analyzed

and the system block diagram of error testing system-FMT is shown. The FMT system adopts CPLD chip to realize the whole error sampling function

at the same time adding the controllable frequency divider module to control the information process

so it can enhance the flexibleness of system. The FMT system adopts CY7C68013 to realize the USB2.0 transmission module

which could satisfy the transmission need of the high-speed sampling system.