Alternating current voltage electric current converter and device and method for testing alternating-current small ammeter

Abstract

An alternating voltage-current converter comprises a standard capacitor and a meter amplifier, wherein the standard capacitor is set as an external connection type; the input bias current of the meter amplifier is less than 1pA, while the input impedance is more than 10<13> Ohm; the standard capacitor is connected with the meter amplifier through a fourwire access method. The fourwire access method is as follows: a capacitor end IH is used as an external voltage signal input end; a capacitor end VH is led to the positive input end of the meter amplifier; a capacitor end VL is connected with the negative input end of the meter amplifier; and a capacitor end IL is used as a signal output end. The alternating voltage-current converter adopts the standard capacitor to realize accurate conversion from alternating voltage to alternating current, and also provides a device and a method for realizing accurate verification of an AC small ammeter; moreover, the alternating voltage-current converter effectively solves the origin problem of AC low current.

Description

technical field [0001] The present invention relates to a voltage-current converter technology, in particular to a high-accuracy AC voltage-current converter and a method for accurately testing a 2μA-2mA / 10Hz-10kHz AC small current meter by using the AC voltage-current converter and realizing the method s installation. Background technique [0002] The current AC voltage-to-current converter is usually a voltage-to-current converter implemented by the voltage-resistance conversion method. Because the high-value resistors used in this converter have different resistance values ​​​​of the AC resistance at different frequencies, and the current resistance is only at 1kHz Therefore, there is the problem of traceability of the value of AC high-value resistance, and it is impossible to realize the precise conversion of AC voltage to small current. AC voltage, thereby calculating the amount of AC current. Since the National Institute of Metrology does not have a traceability meth...

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Problems solved by technology

[0003]Aiming at the defects in the prior art, the present invention provides an AC voltage-current converter, which uses a standard capacitor to accurately convert the voltage source into a small AC current. The device and method involved in the verification of small AC ammeters, and effectively solved the traceability problem of small AC currents

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