324 / | HD | ELECTRICITY: MEASURING AND TESTING |
500 | DF | FAULT DETECTING IN ELECTRIC CIRCUITS AND OF ELECTRIC COMPONENTS {10} |
537 | DF | .~ Of individual circuit component or element {17} |
750 | DF | .~.~ System sensing fields adjacent device under test (DUT) {3} |
753 | .~.~.~ Using electro-optic device |