Projeto De Um Sistema Semi-Automatizado De Medidas De Potencial Elétrico Natural Ou Induzido Do Solo Para Aplicações Geoelétricas

The devices were developed to realize<br>spontaneous and induce voltage measurement on the<br>ground. In both case we used a multiwire cable with<br>multiple voltage inputs along the length that becomes<br>possible to conect it in six stainless electrodes fixed in<br>the ground at same time. An automatic sequence<br>digital system controlled by pushbutton touch allows<br>to couple electrodes sequentially to a electronic DC<br>voltmeter with autozeroing circuit based in PID<br>servocontrol circuit. A 60 Hz notch filter and a roll-off<br>low pass filter with time constant of 1s are used to<br>minimize line and spheric noises. Electronic control<br>system becomes too possible to couple cable with<br>receiver datalogger of SYSCAL R-2 in dipole- dipole<br>sounding array.