Voltímetro digital true RMS com escala automática para equipamentos industriais

Abstract

This work presents the development of a digital true RMS voltmeter with automatic scaling for use in industrial equipment. The instrumentation part of the proposed project consists of a coupling circuit to separate AC and DC signals, a signal conditioning circuit using an operational amplifier (op-amp) with programmable gains, and an RC low-pass filter to eliminate small high-frequency noises. The output signal is then directed to one of the Analog-to-Digital (AD) converter inputs of the Renesas RX130 microcontroller, which processes the signal, adjusts the op-amp scale, and displays the reading on a 7-segment display. The project achieved the desired results, being able to perform true RMS measurements with an accuracy of 3% of the scale limit, thus satisfying the requirements, which can be proven from the results presented. [resumo fornecido pelo autor]