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Measurement method of capacitor and inductor

A technology of capacitance measurement and inductance measurement, which can be used in measurement devices, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., and can solve problems such as complex measurement circuits

Inactive Publication Date: 2013-09-18
MINNAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The measurement circuits of the above four capacitance measurement methods are still relatively complicated

Method used

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  • Measurement method of capacitor and inductor
  • Measurement method of capacitor and inductor
  • Measurement method of capacitor and inductor

Examples

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Embodiment Construction

[0027] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0028] The solution of the present invention is to adopt a first-order RC or RL circuit to measure the transient response of capacitance or inductance, and use the logarithmic time axis differential method to process the data of the transient response and obtain the K (t) curve, at the position of t=τ The peak value of the K(t) curve appears on the above. Therefore, the RC or L / R time constant τ can be obtained by obtaining the abscissa coordinate value of the peak of the K(t) curve, and then it is easy to calculate the value of the capacitance or inductance.

[0029] Capacitance measurement example:

[0030] Such as figure 1 As shown, the capacitance measurement method is based on the constructed circuit schematic diagram, that is, based on the first-order RC circuit. The circuit includes: DC power supply 1, SPDT switch 2, resistor 3, capacitor to...

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Abstract

The invention relates to the technical field of a testing and measuring instrument. A measurement method of a capacitor and an inductor comprises the following steps: A) constructing a first-order RC (Resistor-Capacitor) circuit or a first-order RL circuit by a resistor with a known resistance value R and the capacitor or the inductor to be tested; B) charging the capacitor or the inductor; C) after charging the capacitor or the inductor, forming a discharging circuit by the first-order RC circuit or the first-order RL circuit; in a process of discharging of the discharging circuit, collecting and recording voltage value data of voltage of the two ends of the capacitor in the RC circuit or the resistor in the RL circuit, which is changed along time t; and recording the voltage value data to a function uC(t) or uR(t); D) taking a logarithm time axis Lg(t) to carry out a differential method to process the function uC(t) or uR(t); and solving a derived function K(t); E) solving a coordinate value Lg(T) of a logarithm time Lg(t) horizontal axis corresponding to a curve peak value of the derived function K(t), wherein an RC time constant Tau=T or an LC time constant Tau=T; and F) solving a capacitance C or L of the capacitor, namely: C= Tau / R or L=TauR. The measurement method disclosed by the invention is used for measuring the capacitor and the inductor.

Description

technical field [0001] The invention relates to the technical field of testing and measuring instruments, in particular to a method for measuring capacitance and inductance. Background technique [0002] Commonly used methods for measuring capacitance and inductance mainly include resonance method, oscillation method, AC bridge method and charge and discharge method. In the measurement of capacitance: the resonance method is to introduce the capacitance into the oscillating circuit, so that the oscillation frequency becomes a function of the capacitance, and the capacitance value is calculated by measuring the frequency value; Adjust the resistance and adjustable capacitance to make the bridge balance, and calculate the measured capacitance value according to the resistance and capacitance values ​​of each arm of the bridge at balance; the charge and discharge method uses an AC signal source to charge the capacitor, and then connects the capacitor to the discharge circuit. ...

Claims

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Application Information

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IPC IPC(8): G01R27/26
Inventor 王灵芝吴一纯
Owner MINNAN NORMAL UNIV
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