Multichannel Data Acquisition System

Abstract

Abstract: Multichannel data acquisition system they are capable in field of measurement signals. In this unit is capable to measure four channels of resistance, two channels of voltage and two channels of current measurement channels. In this Development of this system they are ensuring proper functions of various features of system. This paper used in this part of Digital Multimeter. A computer or a standalone device sampled these signals, converts them to digital, and stores them. These devices can be freestanding or connected to a computer, and they can collect data from signal conditioner and counted through fixed gate period to get the frequency. Each channel has programmable input channels, integration amplifiers; voltage ranges on all channels are measured. This configuration generates output frequency is proportional to the resistance, voltage and current of the sensor Microcontroller processed all of these digital values are measured and translated to sensor input current, voltages, and resistance values. Each line is selected using voltage, current, and resistance measurements, and the multiplexer's controlling signal is connected to the microcontroller through an opto-isolator. The multiplexer's output is coupled to an opto-isolator before being routed to a microcontroller for pulse counting. At last, the unit switches to measurement mode automatically counted and displaying the resistance, current, and voltage values on LCD display. Keywords: ARM based Cortex M7 Microcontroller, DC converter, SDRAM, Programming Connector, and LCD Display