ANSI SMPTE ST 26M-1995 Video Recording - 1-in Helical-Scan Recorders - Raw Stock for Reference Tapes.pdf
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1、SMPTE 2bfl 95 8357401 0003883 799 mi SMPTE STANDARD ANIil/SMPTE 26M-1995 Revision of ANSIISMPTE 26M-1989 for Video Recording - 1 -in Helical-Scan Recorders - Raw Stock for Reference Tapes 1 Scope This standard specifies dimensions for the width, thickness, and width deviation of raw tape stock used
2、to record reference tapes for 1 -in helical-scan video tape recorders. Conditions before testing and testing environment are also specified. Page 1 of 2 pages 4 Dimensions 4.1 Tape stock The dimensions of the tape stock for recording refer- ence tapes shall be as specified below: Dimensions Millimet
3、ers 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this standard are
4、 encouraged to investigate the possibility of applying the most recent edition of the standard indicated below: ANSI/ASTM D638M-91, Test Method for Tensile Properties of Plastics Width: 25.350 * 0.025 Thickness: 0.027 to 0.030 Maximum rate of width change: less than 0.01 5 over alength of 250 4.2 Lo
5、ngitudinal dimensional change The longitudinal dimensional change of the raw tape stock kept under the following conditions for 48 hours shall be less than 0.03%). Temperature: 45C I 1C Relative humidity: (85 I 2)% Tape tension: 2.0 N I 0.5 N 3 Conditioning for testing and recording 4.3 Modulus of e
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