Analysis of the harmonic influence to the engineering measurement

Purity of power supply is become one of the most serious problems to the measurement project. With the diversification of electronic devices, harmonic interference in the power system is more and more complicated. The paper uses FLUKE6105A as harmonic power source, and four models of digital multi-meters (DMM) to constitute the test equipment. With the different frequency, distortion, and phase angle, doing the experiment with each DMM respectively. According to the test result, make a further analysis of the harmonic influence. Suggestions are given for engineering application in the end.