AC voltage commutating differential measuring device based on quantum voltage

Abstract

The invention provides an AC voltage commutating differential measuring device based on quantum voltage. The AC voltage commutating differential measuring device comprises a photoelectric commutated switch, two followers, two paths of voltage raising circuits, a differential driving circuit, a filtering circuit, an A / D sampling circuit, an FPGA time sequence control circuit, and an upper computerand data processing module that are connected successively. The upper computer and data processing module stores differential signals measured twice before and after commutation of the photoelectric commutated switch; a measured AC voltage is reconstructed by using the differential signal and an AC quantum voltage; and amplitudes of the AC voltage signals in two reconstruction are obtained based on FFT operation, wherein the average value of the amplitudes is the voltage amplitude of the AC voltage. Therefore, the error of the measurement system is greatly attenuated and the accuracy of the ACvoltage amplitude measurement is improved.

Description

technical field [0001] The invention belongs to the field of metering, and in particular relates to a quantum voltage-based alternating voltage commutation differential measurement device and method. Background technique [0002] In the establishment of the AC voltage reference, commercial instruments are used as samplers for the measurement of AC voltage at home and abroad, such as the digital voltmeter Agilent 3458A. However, due to the limitations of computing power and data transmission bandwidth of digital voltmeters, it is difficult to achieve real-time and continuous power measurement. Usually, the computer controls the digital voltmeter to collect the instantaneous voltage signal for a period of time, and then transmits the data to the computer through the interface, and the computer completes the final calculation of the power. Because this method belongs to non-real-time and continuous measurement, in order to obtain better measurement uncertainty, it needs to put...

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Problems solved by technology

[0003] In practical application, the AC quantum voltage has 10 -8 The magnitude of the voltage amplitude accuracy, but because the measurement system is limited by electronic components, it cannot reach 10 -8 The measurement accuracy of the order of magnitude, therefore, cannot take advantage of the high accuracy of the AC quantum voltage

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