What is a fault excitation source model

Faults in k-fault diagnosis are described using the fault excitation source model. In analog circuits, the nature of the fault is a change in the value of the component parameters, the change in the value of the component parameters will inevitably lead to changes in the current and voltage in the circuit, in the k fault diagnostic theory, it is to consider the change in the voltage and current as a specific source of excitation, so that the faults in the circuit are equivalent to a kind of excitation source of the circuit, according to the excitation value of whether or not the circuit is determined by the faults of the circuit to be zero. The form of fault excitation source can be divided into fault current source and fault voltage source.