Neuro-ERG/V (Technical Manual)
10
1.2. Principle of Operation
The operation of the system is based on the recording and input of biopotentials to
computer to perform the analysis of their electrical activity, including the response to
stimulus.
The block diagram of the system is shown in Fig. 1.
Fig. 1. Block diagram of system.
The function of amplification and recording of biopotentials is performed by
the amplifier unit.
The biopotentials from the electrodes are delivered to the amplifiers of the amplifier
unit where they are amplified, then quantized with the use of the analog-digital con-
verter (ADC) and are transferred to the microcontroller (MC) via 4000 V galvanic isola-
tion. The microcontroller provides the connection with the computer via USB and
the transfer of the digitized data to the computer (PC). Besides, it controls the amplifi-
ers and ADC operation via 4000 V galvanic isolation.
The power supply of the galvanically isolated part of the amplifier unit, i.e. the amplifi-
er module is done via the galvanically isolated direct-voltage transducer of the supply
unit (SU).
The microcontroller of the unit provides the connection between the digital signal pro-
cessor (DSP) of the module and the computer via USB. Also, the MC generates
the amplitude with the use of the pulse-wide modulator (PWM) and the pulse duration
on the photic stimulator with the use of the switches. DSP generates the signal of the
