Absolute Measurement of Signal Strength on Magnetic Recordings

Robert Schwartz, Sheldon I. Wilpon, Frank A. Comerci

The Material Laboratory is in the process of developing a method for measuring the magnetic strength existing on 16mm magnetic soundtrack by using a nonmagnetic loop for the determination of the absolute surface induction at 400 cycles/sec for “pegging” the relative surface induction vs. frequency characteristic obtained by the “short gap” or other approved method. This paper shows that this method was found to be practical for determining the surface induction recorded on presently available commercial ${1\over4}$-in. magnetic tapes, independent of the tape characteristics and the depth of penetration of the recorded signal.

Print ISSN
Published
1955-01
Content type
Original Research
DOI
10.5594/J18391