Yudha Agung Pratama, Suharsono Suharsono

Performance Evaluation of ADS 1256 for Geoelectric Data Acquisition System: Laboratory Scale Comparative Study

Introduction

Performance evaluation of ads 1256 for geoelectric data acquisition system: laboratory scale comparative study. Evaluate the ADS1256 for geoelectric data acquisition. A low-cost system showing promise for medium-to-high resistance measurements, though challenges exist with low resistance and voltage nonlinearity.

Abstract

The need of flexible and affordable geoelectric data acquisition systems is growing, particularly for research and educational purposes. This study aimed to evaluate the performance of a resistance measurement system based on the ADS1256 high-precision ADC module on a laboratory scale. Initial testing was conducted on a laboratory scale using various resistance values. The best accuracy was found in the medium to high resistance range R1 (subsurface target) (>10 Ω); at low resistance, the accuracy value decreased dramatically. A relative error (ε) reading of - 6.7% occured at low values of R1. The condition of the resistance R2 (surface) affected the stability of the ADS 1256 system reading. Based on the standard deviation value there was an indication of nonlinearity in the readings, particularly in the voltage readings. The current measurements produced relatively stable readings. There was an increase in the fluctuation of  readings, especially at low surface medium (R2). Overall, the ADS1256 system demonstrated promising potential as a low-cost alternative for resistance measurement, particularly effective in the medium to high resistance range. Comprehensive data across all R1 and R2 variations require additional calibration and enhanced circuit stability to better align with reference values

Review

This study addresses a practical need for accessible and affordable geoelectric data acquisition systems, particularly for academic and research purposes. The authors undertake a laboratory-scale evaluation of a resistance measurement system built around the ADS1256 high-precision ADC module. The paper aims to critically assess the module's performance, stability, and accuracy across various resistance ranges, ultimately positioning it as a potential low-cost alternative for geoelectric data acquisition. The research identifies several promising attributes of the ADS1256 system. It demonstrated good accuracy, particularly in the medium to high resistance range (R1 > 10 Ω), which is often relevant for subsurface targets. Moreover, the current measurements exhibited commendable stability throughout the testing. These findings strongly suggest that the ADS1256 module holds significant potential as an economical option for resistance measurements within specific geoelectric applications, offering a viable solution for educational and research institutions with budget constraints. Despite its potential, the study also highlights crucial limitations and areas for improvement. Accuracy diminished significantly at low resistance values (R1), evidenced by a substantial relative error. The stability of the ADS1256 system was notably sensitive to surface resistance (R2), and an indication of nonlinearity was observed in the voltage readings. Furthermore, increased fluctuations were reported, particularly at low surface medium (R2) resistances. The authors appropriately recommend additional calibration and enhanced circuit stability to achieve comprehensive data alignment with reference values across all R1 and R2 variations, which will be critical for the system's robust application in real-world geoelectric surveys.

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