| 324 / | HD | ELECTRICITY: MEASURING AND TESTING |
| 500 | DF | FAULT DETECTING IN ELECTRIC CIRCUITS AND OF ELECTRIC COMPONENTS {10} |
| 512 | DF | .~ For fault location {10} |
| 527 | DF | .~.~ By applying a test signal {3} |
| 532 | DF | .~.~.~ Using time measuring {1} |
| 533 | ![]() | .~.~.~.~ Of reflected test signal |