The system comprises a main amplifier unit with a remote active headbox. Any combination of channels may be selected to use a Common Reference electrode.
Circuitry is included to allow a system check to be performed automatically.
Input impedance of each channel is 100MOhm. The electronic inputs of individual channels can be grounded reducing cross-talk noise when recording from less channels. This also disconnects the patient from the electronics. A channel function test can be performed by grounding the input and performing an impedance check - hence producing an known output. The unit is connected to the main unit is via a light weight cable with a plug at the main unit end.