Apparatus for the Measurement of High Constant or Rippled Voltages (Classic Reprint)

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Excerpt from Apparatus for the Measurement of High Constant or Rippled VoltagesThe manufacturer' s rating for each unit was given as 1 meg ohm il pe1 cent with an energy dissipation of 1 watt. With eachg unit subjected in air to an applied potential of volts, d. C., for 8 hours no indication of breakdown appeared. With volts, d. C. (2 watts), for 2 hours, the result indicated that a 100 per cent over load was safe, volts (4 watts) for 2 hours caused breakdown in only 3 per cent of the units tried. These tests, repeated with the units immersed 1n ordinary high-tension transformer oil, showed no breakdowns.A special high-vo-ltage Wheatstone bridge was constructed so that the resistance of the bobbins could be measured under load condi tions. In the two arms of the bridge on one side of the galvanometer were placed, respectively, the unknown resistor of about 1 megohm and a dial manganin resistance box, ranging from 0 to ohms in 1-ohm steps. In the other two arms were placed manganin resist ances of 5, 000 ohms each. Voltages up to volts, d. C., were applied directly to the bridge. With this operated at volts it was possible to detect a change ln resistance of the bobbins of 1 part in 100 although the absolute accuracy was limited to 0. 01 per cent by the uncertainty in the calibration of the bridge arms.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.