| 324 / | HD | ELECTRICITY: MEASURING AND TESTING |
| 600 | DF | IMPEDANCE, ADMITTANCE OR OTHER QUANTITIES REPRESENTATIVE OF ELECTRICAL STIMULUS/RESPONSE RELATIONSHIPS {8} |
| 602 | DF | .~ With auxiliary means to condition stimulus/response signals {3} |
| 603 | | .~.~ For excitation {1} |
| 604 | DF | .~.~.~> Including marker signal generator circuit |