Characterization of high-precision resistive voltage divider and buffer amplifier for ac voltage metrology

International journal of metrology and quality engineering

article

Bjørnar Karlsen¹  Kåre Lind¹  Helge Malmbekk¹  Per Ohlckers² 

[1] Justervesenet;University of South-Eastern Norway

关键词: ac voltage metrology;    traceability;    voltage buffer;    resistive voltage divider;   

DOI  :  10.1051/ijmqe/2019006

学科分类：土木及结构工程学

来源: EDP Sciences

【 摘 要 】

A high-precision voltage buffer and a 10:1 resistive voltage divider have been constructed for use in ac voltage and electrical power metrology. Long-term stability of the buffer’s dc response has been demonstrated by two dc sweeps performed 20 days apart, with best-fit linearized gain varying less than 1mV/V. The absolute ac gain has been measured using a high-precision digital multimeter for 10 Hz and 1 kHz with results consistent with dc within 5mV/V. This value agrees with the characterization of ac–dc difference using thermal converters from different producers with a variety of resistance for various voltages from 1 V to 5 V. The ac–dc difference was further characterized better than 40mV/V for the same voltages up to 100 kHz and better than 100mV/V for 3 V at 1MHz. Absolute ac gain and ac–dc difference has also been measured for the voltage divider and buffer combination from 10 V to 50 V, with similar agreement up to 1 kHz. The ac–dc difference from 10 Hz to 100 kHz of this combination shows an agreement well within 30mV/V in this entire voltage span with a total response not exceeding 125mV/V. This make the voltage divider and buffer combination suitable for sampling electrical powers for a wide range of voltages.

【 授权许可】

CC BY