Precision Measurement of Average Video-Track Rates or Pitch Relations on Quadruplex Recorded 2-in Video Magnetic Tape

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A method of making precision measurements of video-track rates or pitch relations on 2-in quadruplex recorded tape has been developed and has been used for several years. The proposed revision of ANSI Standard C98.6–1965 specifies for a tape, recorded at 15 in/s (38.1 cm/s), an average space between reference points on each fourth consecutive track of 0.062500 in (1.5875 mm) with a tolerance of ± 62 millionths of an inch (0.001575 mm) which amounts to a tolerance of very nearly ± 0.1 % of the track rate or pitch,* in an unstressed or relaxed condition. In attempting to make such measurements certain problems become immediately apparent: tracks made visible with carbonyl iron can be measured repeatedly to only about 0.001 in (0.0254 mm); and measurement of flexible tape to the accuracies specified is difficult if not impossible. A method has been devised to make the repeated measurements to within ± 0.01% of pitch by using a long piece of recorded tape and measuring the span occupied by a known number of tracks. The unstressed-condition dimensions are obtained from measurements at different known tensions and the results are extrapolated to the zero tension condition.
Publication Date: 1972-08-01
DOI: 10.5594/J13497
Link: https://doi.org/10.5594/J13497
Author(s): Roy J. Marian

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Roy J. Marian; Precision Measurement of Average Video-Track Rates or Pitch Relations on Quadruplex Recorded 2-in Video Magnetic Tape, Journal of the SMPTE ( Volume: 81, Issue: 8, August 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J13497

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Roy J. Marian; Precision Measurement of Average Video-Track Rates or Pitch Relations on Quadruplex Recorded 2-in Video Magnetic Tape, Journal of the SMPTE ( Volume: 81, Issue: 8, August 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J13497

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<span class="citation">Roy J. Marian; <cite>Precision Measurement of Average Video-Track Rates or Pitch Relations on Quadruplex Recorded 2-in Video Magnetic Tape</cite>, Journal of the SMPTE ( Volume: 81, Issue: 8, August 1972); SMPTE, 1972. Available at <a href="https://doi.org/10.5594/J13497" target="_blank" rel="noopener">https://doi.org/10.5594/J13497</a></span>

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<li>
Roy J. Marian; <cite id="bib-10-5594-j13497">Precision Measurement of Average Video-Track Rates or Pitch Relations on Quadruplex Recorded 2-in Video Magnetic Tape</cite>, Journal of the SMPTE ( Volume: 81, Issue: 8, August 1972); SMPTE, 1972
<span class="doi">10.5594/J13497</span>
</li>