| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accurately measure a measurement range from a low current value to a high current value. <P>SOLUTION: A current measurement controller 4 controls a current generator 6 so as to produce a current Icont with reversed phase of the current I flowing in a measurement wire 1 measured by a high range sensor CT1. A low range sensor CT2 measures the current I flowing in the measurement wire 1 and the current Icont flowing in the wire 5 simultaneously. A current controller 4 calculates the sum of the current I flowing the measurement current 1 measured with the high range sensor CT1 and the current value Imoni 2 measured by the low range sensor CT2 as a current value flowing in the measurement wire 1. In this manner, measurement error of the high range sensor CT1 can be compensated, and so high accuracy measurement in the measurement range from low current value to high current value becomes possible. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
