Current/voltage conversion traceability method for precision alternating current measurement

Abstract

The invention discloses a current / voltage conversion traceability method for precision alternating current measurement. The method comprises (1) enabling an alternating current voltage-stabilizing source to be input to an alternating voltage proportion standard with known proportional error Eu to perform voltage / voltage proportion conversion, and obtaining standard voltage; (2) enabling the alternating current voltage-stabilizing source to be connected to a voltage type standard resistor with known resistance error Eru, and obtaining standard current; (3) inputting the obtained standard current to a current / voltage converter, performing corresponding current / voltage proportional conversion according to the standard current, and obtaining the converted voltage; (4) comparing the converted voltage with the standard voltage to obtain errors, and using the alternating voltage proportion standard and the voltage type standard resistor to correct the current / voltage converter, namely enabling the proportional conversion accuracy of current / voltage conversion to be traced to the alternating voltage proportion standard and the voltage type standard resistor. According to the current / voltage conversion traceability method, the current / voltage conversion traceability accuracy can be improved.

Description

technical field [0001] The invention relates to a quantity traceability technology, in particular to a traceability method for current / voltage conversion used for precise alternating current measurement. Background technique [0002] Due to the needs of industry and scientific research, precise AC current measurement and traceability technology has recently received more and more attention. As we all know, the measurement of current is based on the measurement of voltage, that is, the current is converted into voltage (current / voltage conversion), and the current is indirectly measured by measuring this voltage. In addition, due to the wide range of AC current in actual work, such as the common 0.002A-100A, and the input range of measuring instruments to ensure accuracy is limited, it is necessary to convert large or small currents into appropriate fixed current values, and then use A standard resistor with a fixed resistance value performs current / voltage conversion; or mu...

AI Technical Summary

Problems solved by technology

[0007] ①The uncertainty of the resistance value of the current-type standard resistor is large, because the power consumption is large when measuring a large current, the current-type standard resistor will generate heat and have a large temperature drift;

[0008] ② When calibrating the combined current-type standard resistor, because the AC impedance bridge has a small working current, it is quite different from the actual working current of the combined current-type standard resistor, and the uncertainty introduced is difficult to measure

[0013] ② There are many factors affecting the uncertainty of the power measurement traceability method, and the angular difference of the current cannot be measured alone

[0014] To sum up, the measurement and traceability of AC current can be realized through processes such as current / current conversion and current / voltage conversion, so the measurement and traceability of AC current has evolved into the traceability of current / current conversion and current / voltage conversion. There are some problems in the two existing traceability methods of AC current measurement, and it is difficult to meet the practical and urgent needs of general electrical metrology laboratories to improve the traceability accuracy of AC current measurement

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