Biomedical subjects
Publications and source records attributed to C J César.
The action potential digitalized and stored by means of a fast solid state electronic waveform recording system (Digitalizer) can be directly read out on a printer or in a computer for further processing. It has been designed a digital interface allowing the automatization of these bioelectrical data acquisition and printing process.
It was designed a fast solid state electronic waveform recording system (Digitalizer), which can record, store and display action potentials or any type of event, either single pulse or repetitive, as a function of time. Above all, its capacity to record fast transients and to give the output in analog and digital form, makes this electronic device more convenient that conventional recorders or single trace oscilloscope systems.
This system is designed for the amplification of the bioelectrical signal, obtention of its derivative in respect to time, automatic brightness control for both beams of the oscilloscope, and stability. The system includes a central measuring section which is a modified Tektronix oscilloscope type 565. Automatic control of brightness as a function of sweeping speed allows photographic recordings.
A solid-state system designed for compensation of asymmetry potentials between microelectrodes, for bioelectric measurements, is described. Advantages over the manual compensator are the following: synchronic compensation of electrodes, application to automatized systems against aging effects in electordes, high speed, and elimination of general muisances of manual circuits. Besides, the system allows to measure digitally the polarization difference and resting membrane potential with precision of +/- 1 mV.