Measurement circuit and device

A technology of measurement circuit and measurement device, which is applied in the field of measurement system, can solve problems such as the short-term open-loop state of operational amplifiers and measurement result errors, and achieve high accuracy and avoid nonlinear errors.

Pending Publication Date: 2020-07-10
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
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Problems solved by technology

This technical solution of switching the gain during the measurement process will cause the operational amplifier to be in the open-loop state briefly and output a pulse peak during the gain switching process, which will introduce nonlinear errors into the measurement results.

Method used

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  • Measurement circuit and device

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Embodiment approach

[0051] According to some embodiments of the present invention, the measurement method also includes:

[0052] Step S112: Outputting data generated during the measurement process to at least one terminal and receiving a feedback signal from the terminal.

[0053] Specifically, the measurement device 1000 is connected to at least one terminal through the communication device 300, such as a user terminal such as a notebook computer, a desktop computer, and a smart phone, or connected to a terminal such as an electronic instrument system, and the data generated during operation is transmitted to To the terminal and receive the feedback signal, so that the user can complete the operation of measurement mode selection, parameter configuration, monitoring the dynamic results of the measurement, ordering the control circuit to execute different algorithms to obtain different physical quantities, etc. at the terminal.

[0054] Through the above steps, it is possible to pre-set the gain...

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Abstract

The embodiment of the invention provides a measurement circuit, and the circuit comprises a first conversion circuit which amplifies an inputted current signal and carries out the current-voltage conversion; a second conversion circuit, connected to the output end of the first conversion circuit and used for carrying out single-ended-differential conversion on the input voltage signal; a third conversion circuit, connected to the output end of the second conversion circuit and used for carrying out analog-digital conversion on the input differential signal; a control circuit, connected to theoutput end of the third conversion circuit, controlling the measuring circuit and performs operation on the input digital signal; wherein the first conversion circuit comprises an amplifier and a feedback resistor bridged between the inverting input end and the inverting output end of the amplifier, and the feedback resistor enables the first conversion circuit to have a single amplification gain.By using the measurement circuit provided by the embodiment of the invention, a measurement result with higher linearity and accuracy can be obtained.

Description

technical field [0001] Embodiments of the present invention relate to a measurement system, in particular to a current measurement circuit and device. Background technique [0002] The measurement of weak currents, especially the measurement of weak currents with a large dynamic range output by nuclear measurement devices such as radiation detectors and fission ionization chambers, has relatively high requirements for measuring instruments. [0003] In the prior art, in order to measure the weak current, an operational amplifier is usually used to amplify the current signal one or more times, and convert the signal form to achieve the measurement purpose. In order to meet the requirement of a large dynamic range, the measurement circuit in the prior art is usually provided with multiple gains, and cooperates with the switching circuit to realize the switching of the range by switching the gain, so as to meet the dynamic range required for the measurement. This technical sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R1/30
CPCG01R1/30G01R19/25
Inventor 洪景彦彭旦李义国郝倩
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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