Design and Implementation of Monitor Tester for Validation of ECG Signals

The paper deals with a design and consequent realization of a monitor tester for validation of the ECG devices, and patient’s monitors for the ECG measurement. In the paper, we describe the electrical design of the plug-in module, which is intended for a transmission of the digital data from the computer. Data are sent by using the controlling SW connected to the parallel port in the plug-in module. An essential part of the proposed module is the three-channel 12 bit D/A converter AD 7398. This converter is able to simultaneously send data from all the three outputs. The converter output is unipolar in the volts units. For this reason, the transmitted signals are adjusted by using the differential amplifiers in order to convert them to the bipolar. The signal’s amplitudes are decreased to the millivolts level by using the voltage dividers. On the base of this solution, the Einthoven ECG leads may be detected.