EQUIPMENT FOR MEASURING BIOSIGNALS

The invention relates to a method and a equipment for measuring the biosignals of low level, covered by noise. According to the invention, the equipment is provided with an instrumentation amplifier () to which a biosignal sampled with some active and reference measuring electrodes, EA and ER, is applied, the biosignal is passed through a filter () of electromagnetic pulses; a common-mode signal () is applied at the input of an operational amplifier in a voltage repeater arrangement (), and the output thereof is applied to some adders () through an operational amplifier (); the signal from the output of the instrumentation amplifier () is applied to an adder () and the useful signal is further on applied at the input of an amplifier () with programmable gain, whose output is an analogue signal which is converted into digital signal () by means of a Delta-Sigma modulator () and a programmable digital filter (); a second instrumentation amplifier () measures the control signal obtained after overlapping the signal generated by a sinusoidal voltage source () of a frequency of 10 kHz over the common-mode signal of a DRL electrode, and the signal from the output of the instrumentation amplifier () is passed through an active band-pass filter () and is applied together with the signal generated by the sinusoidal voltage source () to a synchronous demodulator (), at the output, the signal being converted into digital signal () by an analogue-digital converter (); the equipment control, the numerical adjustments, the numerical processing of the signals measured are solved by the central processing unit () with a microcontroller of medium complexity and with a clock generator precisely controlled by a quartz crystal ().