ELECTRIC METHOD OF GEOLOGICAL PROSPECTING AND DEVICE FOR IMPLEMENTATION OF SAID METHOD Russian patent published in 1995 - IPC

FIELD: instruments. SUBSTANCE: combination of analog and digital integration methods provides increased suppression of noise. During beginning and middle stages of transient process the method involves smooth increment of analog integration time until T_is/4 where T_is is period of industrial noise. During finishing stage of transient process the method involves analog integration during time T_is/4, the result of integration is averaged for 2n intervals T_is/4 where n = 1, 2, 3, ... In addition periodic noises are suppressed because integration time is equal to time of industrial noise. Method is implemented in digital device for electric prospecting. Level of noises is decreased by a factor of eight, noise level is less than 0,5 mcV for any time of measuring while device resolution is 0,1 mcV. EFFECT: increased resolution, decreased energy consumption and decreased time of measurements. 2 cl, 6 dwg