Comparison Between a Reference Torque Standard Machine and a Deadweight Torque Standard Machine to Be Used in Torque Calibration

Abstract

The paper describes the reference torque standard machine with high accuracy and multifunction, developed by our institute, and introduces the structure and working principle of this machine. It has three main functions. The first function is the hydraulic torque wrench calibration function. The second function is torque multiply calibration function. The third function is reference torque standard machine function. We can calibrate the torque multipliers, hydraulic wrenches and transducers by this machine. A comparison experiment has been done between this machine and a deadweight torque standard machine. The consistency between the 30 kNm reference torque machine and the 2000 Nm dead-weight torque standard machine under the claimed uncertainties was verified.

Torque standard comparison among provinces laboratories in China

“…All the comparison test data were collected and analysed, and the normalized deviation value n calculated as in equation (1).…”