Tape Flux Measurement Revisited

McKnight JG, Cortez BE, McKnight JA. Tape Flux Measurement Revisited. In: AES Convention 105. Audio Engineering Society; 1998. Paper 4802. Available from: https://aes.org/publications/elibrary-page/?id=8378

@inproceedings{McKnight1998_8378,
  author = {McKnight, John G. and Cortez, Benito E. and McKnight, Jeffrey A.},
  title = {{Tape Flux Measurement Revisited}},
  booktitle = {AES Convention 105},
  note = {Paper 4802},
  year = {1998},
  month = sep,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=8378}
}

TY  - CPAPER
TI  - Tape Flux Measurement Revisited
AU  - McKnight, John G.
AU  - Cortez, Benito E.
AU  - McKnight, Jeffrey A.
T2  - AES Convention 105
M1  - Paper 4802
PY  - 1998
DA  - 1998/09/06
UR  - https://aes.org/publications/elibrary-page/?id=8378
PB  - Audio Engineering Society
LA  - en
AB  - Analog magnetic recording standards specify recorded signal magnitude in terms of short-circuit flux per unit track width, called fluxivity. Two flux measurement methods are standardized: a direct ac method using a high-efficiency head (AES7/ANSI Standard S4.6); and a transfer-to-dc method using a fluxmeter (German Standard DIN 45 520).: A transfer-to-dc measurement made in the 1950s is used to calibrate the fluxivity of German calibration tapes. When these tapes are measured by the direct ac method, the fluxivity is 10% less than the stated value. Thus the 1950s German transfer-to-dc measurement was 10% more sensitive than the direct ac measurement.: A new comparison of the two measurement methods shows that they actually have the same sensitivity within an experimental error of about 0.5%. Thus we conclude that the German measurement in the 1950s must have had a 10% error, and that the fluxivity on all of the calibration tapes based on the old German measurement is 10% less than the stated value tapes identified as 320 nWb/m are actually 288 nWb/m.
ER  -