| 摘要 |
<p>The invention relates to an apparatus for measuring current intensity in a direct current circuit through which much current flows, e.g., electrolysis of sodium chloride, by measuring the voltage drop in a conductor included in the high current circuit. Noise would normally be generated in the measuring circuit by changes in the magnetic field surrounding the conductor as a result of changes in current flow in the conductor and this would cause errors in current measurement corresponding to said changes. Accordingly, a multi-turn coil is included in the measuring circuit and it is positioned in such a way that the voltage induced into the coil by changes of the magnetic field compensates the noise voltage induced into the other part of the measuring circuit. The exact magnitude of the voltage induced into the coil is controlled by a variable resistor so that it can be equated to said noise voltage.</p> |
