DEVICE TO MEASURE POTENTIALS OF UNDERGROUND STRUCTURE Russian patent published in 2014 - IPC G01R19/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment and may be used in systems of electrochemical protection of underground metal structures against corrosion, in particular, for measurement of polarised and summary potentials. The technical result of the proposed invention is reduction of measurement error, in measurement of first of all the polarisation potential of the underground structure, and simplified process of measurement of summary and polarisation potentials. The technical result is achieved due to the fact that the device for measurement of potentials of the underground structure includes the second unit of conversion of negative voltage, the second analog-digital converter, a measurement cycle shaper with two outlets and one inlet, a unit of noise signal identification, a programming unit. The outlets of the measurement cycle shaper are connected to control units of an electronic switchboard. The inlet of the noise signal identification unit is connected via serially connected the second analog-digital converter and the second unit of negative voltage conversion to the outlet of the buffer amplifier of summary potential. The outlet of the noise signal identification unit, the inlet of the measurement cycle shaper and the inlet of the programming unit are connected to ports of the processor. The first unit of negative voltage conversion is connected between the outlet of the buffer amplifier of the polarisation potential and the inlet of the first analog-digital converter.

EFFECT: invention makes it possible to reduce error of measurement, first of all of polarisation potential of an underground structure, and to simplify process of potentials measurement - polarisation and summary ones.

2 cl, 3 dwg, 2 ex