Method of self-calibrating of current ratio standard device

A technology of current ratio and standard device, which is applied in the direction of measuring device, measuring electric variable, instrument, etc., to achieve the effect of simple structure, convenient use and fast calibration

Inactive Publication Date: 2005-01-12
武汉市龙成电气设备厂
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the deficiencies in the existing technology, in order to solve the problem of fast and efficient calibration o

Method used

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  • Method of self-calibrating of current ratio standard device
  • Method of self-calibrating of current ratio standard device
  • Method of self-calibrating of current ratio standard device

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Embodiment Construction

[0076] A method for self-calibration of a current ratio standard device, the current ratio standard device includes 4 sets (minimum 3 sets, generally 3-5 sets, which makes it more convenient to use when the current is expanded, and the difficulty of manufacturing a comparator is reduced) self-balancing current The comparator, through the steps of self-calibration, addition, β measurement, comparison, and multiplication, completes the absolute calibration of the current ratio, and obtains the current ratio error of each current comparator.

[0077] A schematic diagram of a self-balancing current comparator is available figure 1 express. L1 L2: primary winding; K1 K2: secondary winding. L1, L2 are electrically isolated from K1, K2.

[0078] L2 and K2 are terminals with the same name, that is, if the primary current I1 enters from L2, the secondary current I2 exits from K2.

[0079] The specific calibration circuit is as follows:

[0080] 1. DC current comparator self-calibr...

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Abstract

The device includes self-balanced current comparator, self-checking circuit, primary and secondary circuits and meter for measuring difference. After steps of self-checking, addition, comparison, measuring beta, and multiplication, absolute calibration of current scale is completed, and error of current scale of each self-balanced current comparator is obtained. Wiring is as following: H end of power source is connected to L1 end of comparator to be measured. L2 end and K2 end of comparator are connected to each other. K1 end of comparator to be measured through resistance is connected to ground end and L end of power source. Positive end of meter for measuring difference is connected to the said K2, and its negative end is connected to ground. The device is simple in structure and provides features of quick calibration and high efficiency.

Description

technical field [0001] The invention belongs to the class of electrical instruments, in particular to a method for self-calibration of a current ratio standard device. Background technique [0002] The current proportional standard capable of self-calibration was first proposed by Kuster et al. of the Canadian National Research Institute. The current calibration circuit in my country basically adopts this scheme, and only some improvements have been made in the current regulation. (See JJG2082-90 "Power Frequency Current Proportional Measuring Instrument" and JJF1068-2000 "Calibration Specifications for Power Frequency Current Proportional Standard Device"), the current proportional standard self-calibration system composed of this scheme has the following deficiencies: 1 , Since the whole calibration process is all manually controlled, the wiring is cumbersome and the work efficiency is very low. 2. Because the balance is manually adjusted, the speed is too slow, and somet...

Claims

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Application Information

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IPC IPC(8): G01R35/02
Inventor 曹燕飞姚晓东曹云飞卢启荣
Owner 武汉市龙成电气设备厂
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