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Standard Reference Materials

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Excerpt from Standard Reference Materials: Calibration of Nist Standard Reference Material 3202 for 18-Track, Parallel, and 36-Track, Parallel Serpentine, 12. 65 MM (0. 5 In), 1491 Cpmm (37871 Cpi), Magnetic Tape CartridgeWhen the magnetically encoded data on the tape or disk are converted into electrical signals by the reproducing system, it is necessary for the media parameters to be compatible with the design of other reproducing or recording systems. It is inefficient and unreliable for an electronic system to need continuous readjustment in order to handle nonuniform magnetic media.Interchange standards define a wide variety of mechanical, electrical, and magnetic parameters, such as length, width, thickness, longitudinal curvature, electrical resistance, signal t - o n - oise ratio, etc. However, several magnetic properties, such as typical field, average signal amplitude, overwrite, and resolution, cannot be meaningfully measured directly. Therefore, it is necessary that each type of magnetic computer storage medium intended for interchange be produced with media properties within given relative tolerances. In other words, there must be a reference against which the media parameters can be compared and for which the data processing systems can be calibrated.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.
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