Patent ID: 8098075

Claim:
A method for testing an electronic apparatus having a control unit to which a power supply voltage from a power supply source is applied, comprising: causing the control unit to switch between a working mode and a sleeping mode according to a predetermined instruction set indicative of an operation of a functional element of the electronic apparatus; detecting an alteration of a current waveform of a current corresponding to the power supply voltage prepared by the power supply source as a testing signal of the functional element of the electronic apparatus, wherein the alternation of the current waveform is caused by the control unit being switched between the working mode in which the control unit consumes the current generated from the power supply source, and the sleeping mode in which the control unit does not consume the current generated from the power supply source; defining the testing signal to be having a first logical state and a second logical state; and utilizing a current detection device for detecting whether a current value of the current is larger than a predetermined current threshold within a predetermined time interval in order to determine the first logical state or the second logical state.