Tape Flux Measurement Theory and Verification

McKnight JG. Tape Flux Measurement Theory and Verification. J Audio Eng Soc. 1970;18(3):250-262. Available from: https://aes.org/publications/elibrary-page/?id=1507

@article{McKnight1970_1507,
  author = {McKnight, John G.},
  title = {{Tape Flux Measurement Theory and Verification}},
  journal = {Journal of the Audio Engineering Society},
  volume = {18},
  number = {3},
  pages = {250--262},
  year = {1970},
  month = jun,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=1507}
}

TY  - JOUR
TI  - Tape Flux Measurement Theory and Verification
AU  - McKnight, John G.
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 18
IS  - 3
SP  - 250
EP  - 262
PY  - 1970
DA  - 1970/06/06
UR  - https://aes.org/publications/elibrary-page/?id=1507
PB  - Audio Engineering Society
LA  - en
AB  - Tape flux measurement is useful for standardizing program levels on magnetic tape records, and for measuring the performance of tapes and recording and reproducing heads. A ring-core head is the most satisfactory tape-flux measuring instrument, but calibration of the flux-to-voltage sensitivity is difficult in the general practical case. By using a -symmetrical head- construction, however, the average sensitivity of front and rear gaps is accurately calculated quite easily. For practical measurements, a -high-efficiency head- has the advantage of requiring only one (not two) measurements. The flux-efficiency of the core, and the frequency- and wavelength-response factors are all calculated and experimentally verified for both the symmetrical and the high-efficiency designs. A transfer to unidirectional flux and magnetometer flux measurement gives further verification. A flux measurement accuracy of better than 3% is achieved at medium wavelengths of 0.25 to 2.0 mm.
ER  -