Analysis of a Simple Algorithm for Phase Shift Measurement Between Sinusoidal Voltage Signals

Abstract

This paper presents the analysis of the problem of phase shift measurement error that arises in Simple Algorithm (SAL) when signals are not sampled synchronously. Data acquisition systems allow simultaneous multiple channel measurements by utilising one AD converter with multiplexer. Multiplexer introduces time latency between sampling of different channels, which makes sampling of signals nonsimultaneous. By experimental measurements with NI 6009 data acquisition card and LabVIEW, as well as C++ simulations, two components of the measurement error will be identified: time dependant component which causes phase shift estimations to oscillate and constant component which introduces the offset in performed estimations.