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Harmonic measurements Metering THD THD E89274A Harmonic E89275B Measure the total harmonic distortion (THD) of the current (with respect to fundamental) Select the command THD ITHD(%) I (%) I1 = 7.0 % U (%) I2 = 5.8 % I3 = 6.2 % IN = 2.1 % Select. then View. THD I (%) U (%) Select. 78 E89277B E89276A Measure the total harmonic distortion (THD) of the voltage (with respect to fundamental) then UTHD(%) U12 = U23 = U31 = 1.0 % 1.2 % 1.4 % V1N = V2N = V3N = 2.2 % 2.0 % 2.0 % View. 04443728AA - 01/2009