Current measurement device

A current measuring device, a technology of sourcing current, applied in the direction of measuring device, measuring electrical variable, measuring current/voltage, etc., can solve the problems of open circuit of measuring circuit and inconvenient use, and achieve the improvement of measuring accuracy, simple control method, and solution to switching Modulation effect
CN101839936AActive Publication Date: 2010-09-22RIGOL
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
RIGOL
Publication Date
2010-09-22

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Abstract

The invention relates to a current measurement device, in particular to a DC current measurement device, which comprises a leading-in end 251, a control part 255, a switch part 252, a sampling part 253 and a measuring part 254. The sampling part 253 is provided with a sampling end 262, a sampling end 263 and a sampling end 280, the switch part 252 comprises a switch 282 for controlling the connection or disconnection of a circuit between the leading-in end 251 and the sampling end 262 and a switch 283 which is used for ensuring the connection between the leading-in end 251 and the sampling end 263 or the sampling end 280. The sampling part 253 comprises a current-voltage transforming circuit 265 between the sampling end 280 and the measuring part 254, and the current-voltage transforming circuit 265 is controlled by the control part 255 to be connected or disconnected. When the switch 282, 283 or 276 changes, the leading-in end 251 of the current measurement device is free from the instantaneous circuit break phenomenon, so the measured circuit can be effectively protected; and moreover, the control method is simple, and the work is stable.
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Description

technical field

[0001] A current measuring device of the present invention relates to the field of electric variable measurement, in particular to the field of current measurement. Background technique

[0002] In the prior art, many measuring devices have current measurement capabilities, such as ammeters and multimeters, and some oscilloscopes and test systems also have current measurement capabilities.

[0003] Among them, the most commonly used current measurement circuit has two current measurement terminals 1, 2, a sampling circuit 3, a measurement circuit 4, and a control circuit 5, wherein the current measurement terminals 1 and 2 are used for large current measurement and small current measurement respectively, such as figure 1 As shown, taking DC current measurement as an example, the measurement range of large current usually refers to the range of 200mA-10A, and the measurement range of small current usually refers to the range of less than or equal to 200mA. ...

Claims

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