An analyse on analogue ESR-meter

International Conference on Applied Sciences

自然科学（总论）

Dini, C.M.^1 ; Popa, G.N.^1 ; Cunan, C.D.^1 ; Iagr, A.^1

Politehnica University of Timisoara, Department of Electrical Engineering and Industrial Informatics, 5 Revolution Street, Hunedoara

331128, Romania^1

关键词: Alternating voltages;    Comparative analysis;    Continuous voltages;    Differential voltage;    Measured values;    Voltage amplifiers;    Voltage-current converters;    Wheatstone bridges;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/477/1/012031/pdf
DOI  :  10.1088/1757-899X/477/1/012031

学科分类：自然科学（综合）

来源: IOP

【 摘 要 】

The paper presents an analogue ESR meter, made with a JFET integrated circuit, which can be used to identify defective electrolytic capacitors. It is powered by continuous voltage and consists of a differential voltage source, a 100 kHz oscillator, a Wheatstone bridge with resistors supplied with alternating voltage, in a connecting arm of bridge being connected the electrolytic capacitors to be checked, a voltage amplifier-comparator with optical warning, a high-pass filter and a voltage-current converter. At the output of voltage-current converter is a milliammeter pointing out the ESR value (up to 20 Ω). Measurements were made on a batch of electrolytic capacitors (new and used) and a comparative analysis was performed between the measured values with an analogue ESR-meter and a digital one.