Study on calibration method of resistance ratio for differential resistor reading instrument
The current measurement methods of resistance ratio cannot meet the calibration requirements of high accuracy and full range differential resistance reading instrument.Two methods based on the meas-urement principle of differential resistor reading instruments were proposed to calibrate the resistance ratio indication error.These methods are direct measurement method and comparison measurement meth-od.These methods were compared and verified.The uncertainties are evaluated.The result shows that the absolute value of the difference between the measurement results of the two methods is less than 7 x 10-5,and the normalized deviation value is less than 1,which verified the consistence of these measuring methods.Both methods can be used for the measurement of the resistance ratio indication error.
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