Simple Two-Wire Lead Compensation for Resistive Sensors Using Microcontroller ADCs
[EN] This article introduces a simplified two-wire measurement system for accurate resistance measurement of resistive sensors, leveraging the Anderson current loop. The proposed configuration features a precision reference resistor ( R-ref ) and two diodes ( D-1 and D-2 ), directly interfaced with...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/221701 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/221701 |
| Access Level: | acceso abierto |
| Palabra clave: | Resistance Electrical resistance measurement Lead Sensors Current measurement Voltage measurement Accuracy Wire Resistors Measurement uncertainty Anderson current loop Lead resistance compensation and resistance-temperature detector (RTD) Resistive sensor Two-wire measurement |
| Sumario: | [EN] This article introduces a simplified two-wire measurement system for accurate resistance measurement of resistive sensors, leveraging the Anderson current loop. The proposed configuration features a precision reference resistor ( R-ref ) and two diodes ( D-1 and D-2 ), directly interfaced with the analog-to-digital converter (ADC) and output pins of a microcontroller, eliminating the need for external stabilization resistors. Utilizing ratiometric voltage measurements and an adaptive tuning factor, the system effectively compensates for lead-wire resistance and diode mismatches. A prototype implemented with an ATmega2560 microcontroller demonstrates accurate resistance measurements in the range of 60- 320 Omega , corresponding to a Pt100 sensor, achieving an uncertainty error of less than 0.13% for a lead-wire resistance of 4.87 Omega and 0.15% for 10.0 Omega . Experimental results confirm the system's precision and reliability over long lead lengths, offering a cost effective and robust solution for industrial and remote sensing applications requiring accurate temperature measurements. |
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