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Description of 455-1976 1976New IEEE Standard - Superseded. Telephone companies and equipment manufacturers have generally agreed on a definition for longitudinal balance for many years. This agreement extends also to the basic approach followed when measuring balance. Testing a device for balance involves the application of a longitudinal voltage. Then any resulting metallic voltage is measured, and the ratio of the two voltages is used to develop a balance number. Unfortunately, agreement has ended at about this point. A number of different test circuits are used by different segments of the telephone industry. Although all of the existing test circuits have some merits supporting their use, the mere existence of varied circuits leads to differences in test results. In addition to differences related to the test set, test conditions and procedures can also affect the result. When an item of equipment is to be tested, there is often a test set or procedure,or both, capable of giving any desired result. Agreement on one way of testing for longitudinal balance has been sought. This standard represents such agreement. It defines the basic requirements of a standard test circuit. Reasonable tolerances are included so that a test-set designer will find considerable latitude to make the set his own way. Besides defining the requirements for a test circuit, this standard includes test conditions and procedures that must be established and followed. As a result, all test sets designed and used in accordance with the standard will produce the same balance number for a given test specimen. Similarly, comparing balance numbers for different devices will become more meaningful when all come from tests meeting the standard.This book also exists in the following packages...Subscription InformationMADCAD.com IEEE Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time. Listed IEEE Standards prices are applicaple for US firms whose annual revenue is less than $400 million. All others, please contact us at info@madcad.com or +1 800.798.9296.
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About IEEEIEEE is the world's largest professional association dedicated to advancing technological innovation and excellence for the benefit of humanity. IEEE and its members inspire a global community through IEEE's highly cited publications, conferences, technology standards, and professional and educational activities. IEEE, pronounced "Eye-triple-E," stands for the Institute of Electrical and Electronics Engineers. The association is chartered under this name and it is the full legal name. IEEE creates an environment where members collaborate on world‐changing technologies – from computing and sustainable energy systems, to aerospace, communications, robotics, healthcare, and more. The strategic plan of IEEE is driven by an envisioned future that realizes the full potential of the role IEEE plays in advancing technology for humanity. The IEEE Brand Identity Toolkit explains the basic usage rules for all corporate identity elements and how to utilize them to create a powerful and consistent communications pieces. IEEE is led by a diverse body of elected and appointed volunteer members. The governance structure includes boards for operational areas as well as bodies representing members in the 45 Societies and technical Councils and ten worldwide geographic regions. |
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