| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic force balance having small zero-point fluctuations caused by changes in the humidity. SOLUTION: Since the loadΔW1 is increased by moisture adsorbed/moisture absorbed on the force coil 12 part of an electromagnetic force balancing mechanism part 1 for balancing the load with the electromagnetic force, and thereby, zero-point drift in the negative direction is generated, a humidity correction member 6 for canceling it is fixed onto the under side of a measuring pan 17. The material of this humidity correction member 6 is equivalent to a material of a part, having a strong moisture adsorbing/moisture absorbing properties of the force coil 12, and assuming each distance from a fulcrum spring 28 to the force coil 12 or the humidity correction member 6 a and b, respectively, the loadΔW2 thereof has the relation:ΔW2=(a/b)ΔW1. COPYRIGHT: (C)2007,JPO&INPIT
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