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A method to improve the measurement accuracy of high-current DC ammeter

A technology of DC current and ammeter, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problem of low measurement accuracy of high-current DC ammeter, and achieve the expansion of measurement range, the elimination of large errors, and the improvement of accuracy. Effect

Active Publication Date: 2022-06-17
ZHEJIANG REALLIN ELECTRON
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Problems solved by technology

[0004] The invention mainly solves the problem of low measurement accuracy of the high-current direct-current ammeter in the prior art; provides a method for improving the measurement accuracy of the large-current direct-current ammeter, which has high calibration precision and improves the measurement accuracy of the high-current direct-current ammeter

Method used

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  • A method to improve the measurement accuracy of high-current DC ammeter
  • A method to improve the measurement accuracy of high-current DC ammeter

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Embodiment 1

[0041] Embodiment 1: A method for improving the measurement accuracy of a high-current DC ammeter, such as figure 1 and figure 2 As shown, the high-current DC ammeter includes: a housing 7, a connection base 11, a substrate, a communication module, a storage module, a current measurement unit, a voltage measurement unit, a data interface, two wiring boards 9, a heat sink 10, a sampling resistor and a control The device, the base plate and the communication module are all installed in the casing 7, the communication module, the storage module, the current measuring unit, the voltage measuring unit and the controller are all installed on the base plate, the data interface is installed on the casing 7, the connection base 11 is connected to the casing The side of the body 7 is connected, the two wiring boards 9 are installed on the connection base 11, the sampling resistor is connected between the two wiring boards 9, the current measurement unit measures the voltage division at...

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Abstract

The invention discloses a method for improving the measurement accuracy of a high-current direct-current ammeter, which comprises the following steps: performing parameter calibration on the data collected by the high-current direct-current ammeter; verifying the calibration result, and starting a corresponding repair mechanism according to the verification result; and setting a threshold Range, to reject the ammeter whose sampling error is greater than the threshold range; the present invention adds current small signal compensation calibration; performs noise bias calibration for three voltage channels and one current channel; performs small current, low voltage, and low power In addition to compensation, the measurement range is expanded. In the process of meter calibration, the method of meter calibration range limitation is added, which can effectively eliminate large errors caused by bad manganese copper or hardware circuit errors, and improve the accuracy of data measurement; Use the communication link to encrypt information and data, prevent the data transmitted by the communication module to the server from being intercepted and tampered with, and effectively improve the accuracy of the measurement data.

Description

technical field [0001] The invention relates to the technical field of direct current ammeter equipment, in particular to a method for improving the measurement accuracy of a high current direct current ammeter. Background technique [0002] A DC ammeter is an instrument used to measure the strength of the current in a DC circuit. Since the traditional ammeter uses a magnetoelectric measuring mechanism, the allowable current is very small, about a few microamps to several hundreds of microamps; in practical applications, a shunt resistor needs to be added, resulting in a mutual restriction between the maximum measurement current and the accuracy of the DC ammeter; The maximum measurement current will sacrifice the measurement accuracy in the small current state, and even cannot measure the small current; the problem of narrow range can be solved by the current direct measurement technology, but in the wide range state, the ammeter needs to be finely adjusted to be able to E...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00G01R19/00
CPCG01R35/005G01R19/00
Inventor 孟娟范建国
Owner ZHEJIANG REALLIN ELECTRON
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