A special apparatus for workpieces´ magnetic measurement of joule balance at NIM

This paper presents a special portable apparatus for workpiece magnetism determination of joule balance at NIM. It could be used to evaluate easily the magnetic variation of mechanical parts before and after processing, quickly measuring weak magnetic properties of materials. The measuring process is simple without a customized sample. From the variation of a mutual inductance value in two different conditions, i.e., adjacent and remote to mechanical components, the magnetism variation of material of joule balance would successfully be monitored. The results showed that three mechanical parts of joule balance were mixed with ferromagnetic substance, not satisfied with the requirement of non-magnetic materials.