CURRENT MEASURING DEVICE Russian patent published in 2000 - IPC

FIELD: measurement technology. SUBSTANCE: proposed current measuring device can be used to measure current in test, control and adjustment systems. Traditional current measuring device incorporating cylindrical current guide which internal spaces houses measuring sensitive element connected in series opposition with compensation magnetosensitive element located in plane tangent to surface of cylindrical current guide and parallel to plane of measuring sensitive element is fitted with rod with guides. Measuring sensitive element is positioned in end of rod, internal space is manufactured in the form of slit parallel to axis of current guide. In correspondence with invention device is supplemented with null detector, two two-input valve elements, pulse generator, reversible counter, digital-to-analog converter, power amplifier and auxiliary winding. In this case measuring and compensation magnetosensitive elements connected in series opposition are linked to input of null detector which forward and inverse outputs are connected to first inputs of first and second valve elements correspondingly. Output of pulse generator is connected to their second inputs. Inputs ADDITION and SUBTRACTION of reversible counter are correspondingly connected to output of first and second valve elements and output of reversible counter is connected to input of digital-to-analog converter. Auxiliary winding is placed across output of power amplifier whose input is linked to output of digital-to-analog converter. Auxiliary winding is located on surface of current guide around compensation magnetosensitive element or is anchored on rod around measurement magnetosensitive element. EFFECT: increased accuracy of device thanks to reduction of temperature error and rise of linearity of conversion characteristic. 2 cl, 1 dwg