| 324 / | HD | ELECTRICITY: MEASURING AND TESTING |
| 76.11 | DF | MEASURING, TESTING, OR SENSING ELECTRICITY, PER SE {46} |
| 76.12 | DF | .~ Analysis of complex waves {3} |
| 76.19 | DF | .~.~ Frequency spectrum analyzer {7} |
| 77.11 | ![]() | .~.~.~ Nonscanning {5} |
| 76.28 | DF | .~.~.~.~> Digital filter |
| 76.29 | DF | .~.~.~.~> With filtering {1} |
| 76.33 | DF | .~.~.~.~> Correlation {1} |
| 76.35 | DF | .~.~.~.~> With delay line |
| 76.36 | DF | .~.~.~.~> With optics {1} |