... , they can measure more than 31th harmonics and display the harmonics by bar graphic and by wareform. According to crest factor, K ... - Possibility of upgrading the embedded software via the optical interface - Graphic display: Fresnel diagram, harmonics in bar graph form, U, I displayed ... , VL31,AL1, AL2, AL3, ∑AL, F, ∑P, P1,P2,P3, ∑Q, Q1,Q2,Q3,∑S, S1,S2,S3,∑PF, PF1,PF2 ...