Patent ID: 8089266

Claim:
A device for measuring currents induced in a controller area network (“CAN”) bus harness having a first termination node and a second termination node, the device comprising: a current separator circuit having a radio frequency (“RF”) transformer configured to be connected to the first termination node of the bus harness, the RF transformer having a primary winding with a center tap and a secondary winding; a detection circuit connected to the current separator circuit, the detection circuit having a log-linear radio frequency/intermediate frequency (“RF/IF”) integrated circuit; a power source circuit connected to the detection circuit; an electromagnetic shield enclosing the detection circuit and the power source circuit; a first load connected to the center tap; and a second load connected to the secondary, wherein the detection circuit is connected to the first load and to the second load, and is configured to measure both common-mode and differential-mode currents in the CAN bus harness.