In the article we discuss temperature errors caused by non-stationary thermal processes in a thin-film Hall transducer. When solving the heat conduction equation we show the significant influence of effects of Peltier and Seebeck on the Hall voltage measurement results in the current switching mode. A new twenty-step switching currents algorithm for the Hall transducer is proposed. In this algorithm the additional voltages are measured at the absence of current through the transducer. From the additional voltages we estimate the contribution of the temperature drift. It was experimentally shown that for the PHE602117 converter the additive temperature error decreases by 30 times in comparison with the four-step algorithm while reducing performance by 20%.

Keywords: Hall transducer, additive error, Peltier effect, non-stationary processes, thermo-emf., magnetic measurements, current switching

The article deal with gradiometer is designed for remote nondestructive testing of various purposes pipelines. Gradiometer sensor consists of two Hall-effect transducers three-component magnetic field placed at a distance of 1950 mm from each other. The specialized algorithm for reducing transducer’s bias error is used. The gradiometer sensor’s orientation relative to the pipe axis is determinate by the digital microelectromechanical system. The results of measuring the gradient of the magnetic field induction, module, and the coordinates of the sensor are displayed on the LCD display and saved on non-volatile storage.

Keywords: magnetometry, nondestructive testing, gradient of the magnetic field, the Hall sensor, magnetometer, gradiometer, magnetogram

In the paper the Vlasov equation solution is considered for a case of stationary, homogeneous, isotropic and weakly nonlinear magnetoactive plasma-like media by successive approximations technique. An expression for the quasi-linear conductivity is obtained, which at low magnetic field ceases to depend on the electric field. It is shown that the quasi-linear conductivity matrix is symmetric, and its elements satisfy the classical reciprocal relations. The obtained relations can be applied in the design of magnetic microelectronics devices, for example, to improve the metrological characteristics of the digital Hall magnetometer.

Keywords: reciprocal relations, nonlinearity, plasma-like media, kinetic coefficients, quasi-linear conductivity