Portable diagnostic apparatus for testing circuit breakers

A portable diagnostic apparatus for performing diagnostic testing on a circuit breaker, comprising:

• a number of sensor devices structured to generate a number of sensed parameter signals relating to operation of the circuit breaker during an operational sequence;
• a number of auxiliary input connectors structured to receive a number of auxiliary data signals from the circuit breaker, the number of auxiliary data signals relating to and being generated in response to the operation of the circuit breaker during the operational sequence;
• control and diagnostic circuitry structured to control operation of the portable diagnostic apparatus, receive the number of sensed parameter signals and the number of auxiliary data signals, and generate a time signature based on the number of sensed parameter signals and the number of auxiliary data signals, a first input element structured to be selectively connected to a signaling module external to the portable diagnostic apparatus, the signaling module being structured to provide a number of control signals for the circuit breaker, the number of control signals being configured to cause the circuit breaker to perform the operational sequence, the portable diagnostic apparatus being structured to receive the number of control signals through the first input element;
• and a first output element structured to be selectively connected to the circuit breaker, the first output element being coupled to the first input element within the portable diagnostic apparatus to receive the number of control signals from the first input element, the diagnostic apparatus being structured to provide the number of control signals to the circuit breaker through the first output element, wherein the number of sensor devices are coupled in between the first input element and the first output element to measure the number of control signals.