A system for recording a non-distorted evoked potential, comprising:a signal output operable to couple directly or indirectly to a stimulating electrode to deliver an electrical stimulus to a body；a signal input operable to couple directly or indirectly to a recording electrode to receive a detected signal, wherein the detected signal comprises high frequency interference and an evoked potential generated by the body's nervous system in response to the electrical stimulus； anda processing circuit coupled to the signal input, wherein the processing circuit comprises: a microprocessor configured to process and analyze a recorded signal, and an amplifier system, wherein the amplifier system comprises: a first signal path configured to amplify the evoked potential, and a second signal path configured to detect the high frequency interference,wherein the first signal path and the second signal path are connected to the microprocessor, andwherein the microprocessor is further configured to suspend data acquisition from the first signal path and suspend amplification within the amplifier of the first signal path upon detection of high frequency interference within the detected signal.
