Osciloscópio virtual com interface USB para microcomputadores

Abstract

The proposal of this work is to present the development and assembly of a virtual oscilloscope, by developing a software within the LabVIEW®, from National Instruments, together with Smart-Tech’s DAQ the PenDAq®, and scaling circuit. This paper shows the steps involved in the development of the voltage coupling hardware to the Data acquisition board, in which resistors arranged as resistive dividers were used, to allow the operator to select up to four scales for each one of the two available channels for acquisition and the other two remaining channels from the DAQ, reserved for the feedback of the scale selection. A program was developed using the LabVIEW®. This program allows that the data acquired by the PenDAq® is received by the computer and organize this information in such way as to, not only, present a waveform to the user, but also, to provide in a quick and easy way to identify, relevant values for a later analytical study of the signals and data collected.