324 / | HD | ELECTRICITY: MEASURING AND TESTING |
76.11 | DF | MEASURING, TESTING, OR SENSING ELECTRICITY, PER SE {46} |
76.39 | DF | .~ Frequency of cyclic current or voltage (e.g., cyclic counting etc.) {6} |
76.41 | DF | .~.~ Frequency comparison, (e.g., heterodyne, etc.) {4} |
76.47 | DF | .~.~.~ Digital output {1} |
76.48 | .~.~.~.~ With counter |