In this paper, design of experimental teaching on electrical signal distortion
due to the harmonic currents in the variable speed drive. for high vocational certificate study in electrical power field was proposed. The proposed kit was mentioned on electrical signal distortion due to the harmonic currents in the variable speed drive control technology in timer and counter method for electrical signal distortion due to the harmonic currents in the variable speed drive. that mostly use in industries. To define needed experimental topics and pattern, content analysis was introduced.