A virtual instrument based on the power system harmonic measurement. Introduced under the national standard requirements for the measurement of the harmonic power quality analyzer using this virtual instrument measurement of harmonics, described in the paper presents a virtual instrument based on the power system harmonic measurement technology. Introduced under the national standard requirements for the measurement of the harmonic power quality analyzer using this virtual instrument measurement of harmonics, described in the harmonic measurement of the actual work location, content, method, measurement of how wiring, measurement after measurement treatment and measurement considerations. Through field measurement test, the measurement technology were linked to net measured current and voltage harmonics I to 50 parameters used to determine eligibility harmonic for harmonic analysis and provide the basis for harmonic suppression.