Title :
An accurate voice-frequency-level calibrating set for field use
Author_Institution :
Bell Telephone Laboratories, Inc., Murray Hill, N. J.
Abstract :
In order to maintain the accuracy of loss measurements commensurate with the requirements of direct distance dialing (DDD), very accurate test tones are needed. This paper describes a rugged, portable calibrating set used to insure the accuracy of the test tones. A telephone craftsman may use this set to adjust the level of a signal with 0.3% accuracy. A means for analytically determining the accuracy of such a set is given in the Appendix.
Keywords :
Accuracy; Calibration; Detectors; Equations; Oscillators; Standards; Switches;
Journal_Title :
American Institute of Electrical Engineers, Part I: Communication and Electronics, Transactions of the
DOI :
10.1109/TCE.1963.6591401
