RT Journal Article
T1 Improved calibration method for resistive sensors using direct interface circuits
A1 Hidalgo-López, José Antonio
A1 Botín-Córdoba, Jesús Alberto
A1 Sánchez-Durán, José Antonio
A1 Tejero-Calado, Juan Carlos
A1 Oballe-Peinado, Óscar
K1 Circuitos electrónicos
K1 Sensores
AB Traditional calibration methods for measuring resistance values using a direct interface circuit, comprising a capacitor and some calibration resistors, offer a straightforward, economical option. However, such methods show greater inaccuracies as resistance values decrease. This article presents a modification of the method that ensures more accurate measurements and extends the range of resistance values that can be measured. Unlike the linear equation used in the traditional method, the proposed method obtains power functions related to resistance value and measured discharge time. Since these circuits need calibration resistors, criteria are established to find their values. To reduce arithmetical complexity two approximations are tested to calculate the exact value of the resistance. With this approach, the relative errors for low resistances are reduced and the measuring range is extended. Three measurement set-ups were carried out with a microcontroller and an FPGA to validate the results, showing the validity of the method independently of the device. Using the FPGA configured so that the maximum current that can be sink per output pin is 24mA, the error in the estimation of a resistance of 9.9 Ω is 10 times less than that obtained using the classic two points calibration method.
PB Institute of Electrical and Electronics Engineers (IEEE)
YR 2019
FD 2019-12-10
LK https://hdl.handle.net/10630/36649
UL https://hdl.handle.net/10630/36649
LA eng
NO J. A. Hidalgo-López, J. A. Botín-Córdoba, J. A. Sánchez-Durán, J. C. Tejero-Calado and Ó. Oballe-Peinado, "Improved Calibration Method for Resistive Sensors Using Direct Interface Circuits," in IEEE Transactions on Instrumentation and Measurement, vol. 69, no. 8, pp. 5693-5701, Aug. 2020, doi: 10.1109/TIM.2019.2958583.
NO (c) 2019 Crown Copyright. Personal use is permitted. For any other purposes, permission must be obtained from the IEEE by emailing pubs-permissions@ieee.org. " Versión Aceptada descargada del "IEEE Author Gateway". IEEE autoriza a publicar esta versión en repositorios institucionales".
NO This work was supported in part by the Spanish Government, in part by the European ERDF Program Funds under Contract TEC2015-67642-R, and in part by the Universidad de Málaga Program under Grant “Plan Propio 2018”.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026