Title :
Bridge Based on an Automated Synchronous Sampling System
Author :
Overney, Frédéric ; Jeanneret, Blaise
Author_Institution :
Fed. Office of Metrol., Bern-Wabern, Switzerland
fDate :
7/1/2011 12:00:00 AM
Abstract :
An RLC bridge based on an automated synchronous sampling system has been developed using commercially available high-resolution analog-to-digital and digital-to-analog converters. This bridge allows the comparison of any kind of impedance standards in the four-terminal-pair configuration at frequencies between 50 Hz and 20 kHz within a range from 1 Ω to 100 kΩ. An automatic balance of the bridge is carried out using a downhill simplex algorithm. Consistency checks have been realized by comparing resistance, inductance, and capacitance standards at different frequencies. The consistency of the measured voltage ratio is better than 20 μV/V over the whole frequency range and even smaller than 5 μV/V around 1 kHz. Finally, the results of the calibration of a 10-nF capacitance standard have been compared to those obtained using a commercial high-accuracy capacitance bridge. The difference is smaller than the commercial bridge specifications over the whole frequency range.
Keywords :
RLC circuits; analogue-digital conversion; bridge circuits; digital-analogue conversion; signal sampling; RLC bridge; analog-to-digital converter; automated synchronous sampling system; digital-to-analog converter; downhill simplex algorithm; frequency 50 Hz to 20 kHz; impedance standards; Bridge circuits; Capacitance; Current measurement; Impedance; Standards; Uncertainty; Voltage measurement; Bridge circuits; calibration; impedance; measurement techniques; metrology; sampling methods;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2010.2100650