Weighing in a strong magnetic field

It was studied whether micro balances can work properly and show accurate weighing results under a strong magnetic field. Although a nuclear magnetic resonance device (NMR) generates a very strong magnetic field, it is generally operated by the constant a power of a magnet. In the surroundings of a NMR device, electronic micro balances have shown accurate weighing results as long as they were properly operated and calibrated before use. In the case of mechanical micro balances, although a few μg changes were observed, they were correctable by calibration before use. At a place near to the mass spectrometer (MS), which always changes its magnetic power, micro balances showed slight changes in the weighing results. However, accurate weighing results were confirmed as long as a certain distance from the MS was maintained. Other disturbances caused by the magnetic field were observed while handling or moving a magnetic substance near to the micro balances. In such cases, a significant change in the weighing results or unstable results was observed.