| 324 / | HD | ELECTRICITY: MEASURING AND TESTING | 
| 600 | DF | IMPEDANCE, ADMITTANCE OR OTHER QUANTITIES REPRESENTATIVE OF ELECTRICAL STIMULUS/RESPONSE RELATIONSHIPS {8} | 
| 629 | DF | .~ Distributive type parameters {6} | 
| 633 | DF | .~.~ Using resonant frequency {3} | 
| 636 |  | .~.~.~ With a resonant cavity |