Apparatus and method for measuring micro-phm level electric resistance

A micro-ohm-level, resistance-to-be-measured technology, applied in measuring devices, measuring resistance/reactance/impedance, measuring electrical variables, etc., can solve problems affecting the accuracy of measurement, changes in the resistance value of the measured resistance, etc., to improve the measurement Accuracy, small temperature rise effect, power and weight reduction effect

Inactive Publication Date: 2007-08-22
西安四方机电有限责任公司
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Problems solved by technology

[0006] It can be seen from the above formula group that the resistance is a function of the temperature T, and the temperature T is a function of the current I and the time t passing through the resistance, which is a proportional relatio

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  • Apparatus and method for measuring micro-phm level electric resistance
  • Apparatus and method for measuring micro-phm level electric resistance

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] As shown in Figure 1, a device for measuring micro-ohm level resistance includes a control unit, a sampling unit connected to the control unit with a bidirectional signal and a controllable power supply 2, the control unit is composed of a micro The processor CPU control circuit is composed, and the sampling unit is composed of a current analog-to-digital converter A / D 1 And the current amplifier 5 connected to it, a voltage analog-to-digital converter A / D 2 and the voltage amplifier 6 connected to it; the controllable power supply 2 is a DC constant current source whose output voltage gear can be adjusted according to the resistance range of the resistance RL to be measured, which is formed by connecting a charging switch K1 to an energy storage capacitor C The charging circuit, the energy storage capacitor C is connected wit...

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Abstract

This invention discloses an impact-current measuring method and the corresponding device that is to settle the existing defect of the large volume and low measurement accuracy of the micro-ohm resistance measurement device. The controlling unit controls the closing of switch of the charging circuit, the open of switch of the discharging circuit making the controllable electric power source in the charging circuit charge a storage capacitor. Then the controlling circuit opens the charging circuit switch and closes the discharging circuit switch sending the triggering signal to the sample unit at the same time. The storage capacitor generates the impact current to the non-measured resistance and the sample unit receives the triggering current and voltage data of the non-measured resistance through the current and voltage sensors in the discharging circuit and feedbacks to the controlling unit which reads the data and gets the resistance value after computer's process. The measuring device following the this invented method can be widely used to the manufacture of portable and high-accuracy loop resistance-measure device, switch contact resistance meter and the ground meter.

Description

technical field [0001] The invention relates to a device and method for measuring resistance, in particular to a device and method for measuring micro-ohm level resistance. Background technique [0002] The traditional method of measuring resistance is generally to use DC constant current source measurement, and its measurement principle is very simple: use DC constant current source current to pass through the measured resistance, and perform signal acquisition and A / D (analog-to-digital converter) conversion after signal conditioning , and then calculate and display the output. For the large current loop, since the measured resistance can be as small as micro-ohms, when the output current of the constant current source is relatively small (less than 100A), the voltage drop generated is also very small, and because the signal-to-noise ratio is also small, Therefore, the sensitivity (accuracy) of the resistance measuring device is required to be very high. The traditional ...

Claims

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Application Information

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IPC IPC(8): G01R27/08
Inventor 韩伯锋辛建仓
Owner 西安四方机电有限责任公司
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