Low-Cost Geoelectric Equipment: Design and Development of a Voltage Measurement System
Suharsono, Wahyu Hidayat, Heru Suharyadi, Yudha Agung Pratama

Geophysical Engineering Department, Faculty of Mineral Technology and Energy, UPN Veteran Yogyakarta
Mining Engineering Department, Faculty of Mineral Technology and Energy, UPN Veteran Yogyakarta

Abstract

The measurements were performed using a KA3005D digital power supply capable of ranging from 0.01 to 30 volts. This power supply provided a reliable and adjustable source of voltage for the experiments. A Fluke 116 multimeter was used as the reference instrument, ensuring accurate and precise voltage measurements. Additionally, an ADS1256 analog-to-digital converter system was utilized to collect the data, allowing for digital capture and storage of the voltage readings. This research aims to develop cost-effective geophysical equipment that retains a high degree of measurement precision. The results, averaged and analyzed for standard deviation, showed a linear relationship between the reference value (x) and measured value (y) as ( y = 1.0071x - 0.0032 ), indicating high accuracy with a slight offset. The standard deviation, described by ( y = 0.0002x + 0.011), increased slightly with higher reference values, suggesting growing measurement uncertainty. Systematic error and relative error were analyzed, revealing linear and sub-linear patterns respectively. The system^s accuracy is generally satisfactory but requires improvements for low voltages (<5V) and higher precision for elevated measurement voltages. The microcontroller-based voltage measurement system with auto-ranging and a 24-bit ADC offers reliable and accurate measurements

Keywords: ADS1256, Voltage Measurement, Geolectric

Topic: Engineering