Circuit energization status test device and method

A circuit for testing a circuit under test (CUT), the circuit comprising:

• a circuit plate;
• an electromagnetic field (EMF) sensor disposed on the circuit plate;
• a conductor extending along the circuit plate and positioned proximal the EMF sensor;
• a signal detector disposed on the circuit plate and coupled to the EMF sensor;
• and
• an interface extending from the circuit plate, the interface adapted for coupling the conductor to the CUT, wherein the EMF sensor is configured to:
• generate a signal in the presence of a time varying flow of current from the CUT in the conductor;
• and
• provide the signal to the signal detector;
• wherein the signal is indicative of a time varying flow of detector current;
• and
• wherein the circuit further includes a power converter coupled to the signal detector, the power converter configured to receive at least a portion of the detector current for providing power to the signal detector.