Effect of service temperature conditions on the electromotive force of unsaturated portable standard cells
J.H. Park · Bureau of Standards Journal of Research · 1933
The effect of external temperature disturbances such as might occur in practice on the electromotive force (emf) of unsaturated portable standard cells of the models in general use as secondary standards, was investigated.The experiments included unequal heating of different parts of the cell and sudden changes of temperature.Temporary changes in cell emf, caused by these disturbances, in some cases as large as 1.8 mv (nearly 0.2 of 1 per cent), were measured and the results are shown by curves.During all tests the cell elements were left in the cases furnished with them.Methods of protecting the cells from external temperature disturbances were tried and their effectiveness is shown.