| Автор: Wenner Frank
Название: The Testing of Potentiometers (Classic Reprint)
ISBN: 1333780400 ISBN-13(EAN): 9781333780401
Издательство: Неизвестно
Цена: 7330.00 T
Наличие на складе: Невозможна поставка.
Описание: Excerpt from The Testing of Potentiometers The test therefore consists in making such measurements as are necessary for the determination of the ratio of Re to R s for all settings of both R, and R S. When a potentiometer is used in conjunction with a standard resistance and standard cell for determining the current or power, the measurement with the potentiometer is in reality that of a potential difference. The test just referred to is therefore all that is required.' The resistance of the coils is not always accurately adjusted, nor does it remain constant but changes somewhat with time. The greatest change occurs within one year after construction and may amount to as much as several hundredths per cent. Later the changes seldom amount to as much as one hundredth per cent during a year, in well-constructed potentiometers. Therefore potentiometers which are to be used in measurements of high precision 1 should be calibrated occasionally, especially during the first few years. If this is done and the corrections applied, errors on account of lack of adjustment of the coils or on account of changes in their resistance can be eliminated. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.
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