The joule balance is one of the mass traceability devices in the revised International System of Units, and its smooth operation relies on a compensation coil to reduce the effect of the external magnetic field. In this paper, the interaction between the magnetized coil-suspension system and the compensation coil, which has never been noticed, is theoretical analyzed and experimental verified. First, an additional induced voltage can be detected in the compensation coil when it moves relative to the magnetized coil-suspension system, which will lead to a measurement deviation of several parts in E6 in the moving phase. Second, if the excitation current also flows through the compensation coil in the weighing phase, then an additional magnetization force which can not be canceled out by the mass-on and mass-off measurements will be applied on the coil-suspension system. Theoretical analysis indicates that the deviations introduced in the two phases are nearly equivalent, so that the final mass measurement result will not be affected at least on the magnitude of E-9. However, this conclusion can only be verified at E-8 level due to the current measurement limitations of the joule balance.

中文翻译：

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焦耳天平中磁化线圈-悬挂系统与补偿线圈之间的相互作用

焦耳天平是修订后的国际单位制中的质量追溯装置之一，其平稳运行依靠补偿线圈来减少外部磁场的影响。在本文中，磁化线圈-悬架系统与补偿线圈之间从未被注意到的相互作用进行了理论分析和实验验证。首先，补偿线圈在相对于磁化线圈-悬挂系统移动时会在补偿线圈中检测到额外的感应电压，这将导致移动阶段E6中的几个部分的测量偏差。其次，如果在称重阶段励磁电流也流过补偿线圈，然后在线圈悬挂系统上施加一个附加的磁化力，该磁力不能被质量上和质量下的测量抵消。理论分析表明，两相引入的偏差几乎相等，因此最终的质量测量结果至少不会受到E-9量级的影响。但是，由于焦耳天平目前的测量限制，这个结论只能在 E-8 级别得到验证。