MEASURING DEVICE FOR GEOLOGICAL ELECTRIC PROSPECTING Russian patent published in 2003 - IPC

FIELD: frequency sounding with natural and artificial magnetic and electric excitation of electromagnetic field. SUBSTANCE: measuring device is predominantly intended for measurement of intensity of spectral components of series of harmonics of electromagnetic field utilized in investigation of upper part of the Earth's crust. Measuring device has five channels. Each channel includes transmitter, band-pass filter, attenuator and synchronous filter connected in series, interface connected with information inputs to control buses of attenuator, to bus setting frequency and to output of analog-to-digital converter and with output to input of information storage circuit, code-controlled frequency divider connected with information input to output of master generator, with control input to control input of band-pass filters and bus setting frequency and with output to control inputs of synchronous filters through first pulse counter, frequency divider, second pulse counter and analog commutator connected with output to information input of analog-to-digital converter, with information inputs to outputs of synchronous filters and with control input to output of second pulse counter connected with input to control input of analog-to-digital converter and to output of frequency divider connected with input to output of master generator. EFFECT: enhanced noise immunity and expanded functional potential of device. 2 dwg