US PATENT SUBCLASS 324 / 604
.~.~.~ Including marker signal generator circuit

Current as of: June, 1999
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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  DF  .~.~ For excitation {1}
604.~.~.~ Including marker signal generator circuit

DEFINITION

Classification: 324/604

Including marker signal generator circuit:

(under subclass 603) Subject matter wherein the auxiliary means includes a circuit which injects one or more pips of specific frequency onto the response curve from the circuit or substance being measured or tested.