1、SMPTE STANDARD SMPTE 225M-2003 Revision of ANSVSMPTE 225M-1996 for Television Digital Component Recording - 19-mm Type D-1 - Magnetic Tape Page 1 of 3 pages 1 Scope This standard specifies the principal properties of the magnetic tape used for 19-mm type D-1 television digital component recording. 2
2、 Measurement environment 2.1 Dimensions are in the metric system. 2.2 Tests and measurements made on magnetic tape to check the requirements of this standard shall be made under the following atmospheric conditions unless otherwise stated: - Temperature: 20C i 1C - Relative humidity: (50 2 2)% - Bar
3、ometric pressure: 90 kPa * 10 kPa 2.3 Conditioning of the tape stock before recording and testing shall be as follows: - Storage conditioning: Not less than 24 hours. - Environmental: Stabilized to the conditions specified in 2.2. - Tape tension: Wound on a reel at a tension of 0.6 N to 1.5 N. 3 Vid
4、eo tape specifications 3.1 Base The base material shall be polyester or equivalent. 3.2 Width The tape width shall be 19-01 O mm f 0.01 5 mm. The users attention is called to the possibility that compliance with this standard may require use of an invention covered by patent rights. By publication o
5、f this standard, no position is taken with respect to the validity of this claim or of any patent rights in connection therewith. The patent holder has, however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applica
6、nts desiring to obtain such a license. Details may be obtained from the publisher. No representation or warranty is made or implied that this is the only license that may be required to avoid infringement in the use of this standard. Copyright e2003 by THE SOCIETY OF MOTION PICTURE AND TELEVISION EN
7、GINEERS 595 W. Hartsdale Ave., White Plains, NY 1W7 (91 4) 761 -1 1 00 Approved February 7,2003 SMPTE 225M-2003 3.2.1 The tape, covered with a glass plate, shall be measured without tension at a minimum of five different positions along the tape using a calibrated microscope or profile projector hav
8、ing an accuracy of at least 2.5 pm. Tape width is defined as the average of the five readings. 3.3 Delta width Delta width (width fluctuation) shall not exceed 6 pm p-p. 3.3.1 Measurement of delta width shall be over a tape length of 230 mm with a tension of 0.8 N. 3.4 Reference edge straightness Th
9、e reference edge straightness maximum deviation is 6 pm p-p. 3.4.1 Edge straightness fluctuation is measured at the edge of a moving tape guided by three guides having contact to the same edge and having a distance of 11 5 mm from the first to the second guide, and 11 5 mm from the second to the thi
10、rd guide. Edge measurements are averaged over 1 O-mm lengths and are made at a point 5 mm from the mid-point between the first and second guide which is 52.5 mm from the first guide. 3.5 Tape thickness Use of tapes with various thicknesses is permitted within the following values: - Nominal 16-pm ta
11、pe shall have a thickness between 13.5 pm and 16 pm. - Nominal 13-pm tape shall have a thickness between 11 pm and 13 pm. 3.6 Transmissivity Transmissivity shall be less than 5%, measured over the range of wavelengths 700 nm to 900 nm. 3.7 Offset yield strength Offset yield strength shall be greater
12、 than 15 N. 3.7.1 The force to produce 1% tangential elongation of a 200-mm test sample with a pull rate of 100-mm per minute shall be used to confirm the offset yield strength. 3.7.2 The initial tangential slope is extended and read at 1% elongation. 3.8 Magnetic coating The magnetic tape used shou
13、ld. have a coating of improved metal oxide or equivalent. 3.8.1 The coating coercivity shall be a class 850 oersted (68,000 Nm). For measurement techniques, refer to IEC Publication 60735. 3.8.2 The oxide particles shall be longitudinally oriented. Page 2 of 3 pages SMPTE 225M-2003 Annex A (informat
14、ive) Bibliography ANSVSMPTE 226M-1996, Television Digital Recording - 19-mm Tape Cassettes ANSVSMPTE 227M-1996, Television Digital Component Recording - 19-mm Type D-1 - Helical Data and Control Records ANWSMPTE 228M-1996, Television Digital Component Recording - 19-mm Type D-1 - Time and Control Co
15、de and Cue Records SMPTE 224M-2003, Television Digital Component Recording - 19-mm Type D-1 - Tape Record SMPTE EG 10-2003, Tape Transport Geometiy Parameters for 19-mm Type D-1 Television Digital Component Recording SMPTE EG 21 -1 997, Nomenclature for Television Digital Recording of 19-mm Type D-1 Component and Type D-2 Composite Formats IEC 60735 (1991-11), Measuring Methods for Video Tape Properties ITU-R BT. 601-5 (10/95), Studio Encoding Parameters of Digital Television for Standard 4:3 and Wide-Screen 16:9 Aspect Ratios Page 3 of 3 pages
