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Current measuring method and system

A technology of current measurement and voltage measurement, which is applied in the direction of using digital measurement technology to measure, to achieve the effect of reducing errors

Inactive Publication Date: 2018-05-01
FLEX INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to solve the problems caused by the existing current measurement

Method used

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Embodiment Construction

[0028] Detailed description and technical content of the present invention, now just explain as follows with respect to matching drawing:

[0029] see figure 1 and figure 2 , the present invention provides a method for measuring current, comprising the following steps: Step 100, according to the current direction of a circuit 20 to be tested, a test current input point 201, a first voltage detection point 202, and a second voltage are sequentially defined Detection point 203 and a test current output point 204; step 2 101, an adjustable current source 31 and a voltage measurement module 32 are connected in parallel to the circuit 20 to be tested, the impedance of the voltage measurement module 32 is much larger than the circuit 20 to be tested impedance, the adjustable current source 31 is electrically connected to the test current input point 201 and the test current output point 204 to form a loop, and the voltage measurement module 32 is electrically connected to the firs...

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Abstract

The invention provides a current measuring method and system. With the method, an adjustable constant current source and a voltage measuring module are connected in parallel to a line to be measured.The impedance of the voltage measuring module is way greater than the impedance of the line to be measured. Testing current, differing incurrent value, is supplied by separated times to the line to bemeasured by using the adjustable constant current source. Through the voltage measuring module, the voltage signal of each testing current flowing into the line to be measured can be obtained and current voltage variance and current variance among the testing currentcan be calculated. The impedance of the line to be measured can be calculated based on the voltage variance and the current variance, and then electric power issupplied by an electric power source belonging to the line to be measured. Through the voltage measuring module, the voltage signal of the measured part can be obtained, and current can be calculated based on the voltage signal and the impedance of the line to be measured.

Description

technical field [0001] The invention relates to a current measurement method and system thereof, in particular to a method and system capable of performing current measurement on a line to be tested in parallel. Background technique [0002] In the prior art, when it is desired to measure the current of a part of a circuit, it is necessary to open the part of the circuit to be measured first, and connect the three-purpose electric meter in series to the open part of the circuit. After the current measurement is completed, use the Partial restoration of the open circuit. Although such an implementation method can achieve the purpose of measuring the current, the pre-processing and restoration operations generated by this implementation method are too cumbersome, which is not conducive to rapid measurement. However, if the three-purpose electric meter is connected in series in the circuit, the impedance of the three-purpose electric meter itself will affect the overall impeda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 陈文宗
Owner FLEX INSTR