324 / | HD | ELECTRICITY: MEASURING AND TESTING |
76.11 | DF | MEASURING, TESTING, OR SENSING ELECTRICITY, PER SE {46} |
76.77 | DF | .~ Phase comparison (e.g., between cyclic pulse voltage and sinusoidal current, etc.) {11} |
84 | .~.~ With waveguide (e.g., coaxial cable) |