The methods for improving the measuring accuracy of resistance strain type rolling force dynamometer are analyzed from such two aspects as sensor and secondary instrument respectively. The manufacturing accuracy and on-site installation conditions of sensor are the main factors affecting accuracy. The voltage-multiplying of excitation power supply and six-wire bridge circuit are helpful to reduce the errors caused by excitation power supply. The ratio calibration of sensor could solve the problem of measurement errors caused by calibration errors, which is very convenient to apply in the steel rolling field. The modified formulas of calibration ratios are obtained through mathematical derivation considering the problem of cable between the sensor and secondary instrument in the steel rolling field.

rolling force  /  force cell  /  dynamometer  /  resistance strain gage  /  self-calibration of sensor