1、SMPTE STANDARD for Television Digital Recording - 19-mm Type 0-2 Composite ,Format - Magnetic Type SMPTE 246M-2003 Revision of ANSVSMPTE 246M-1993 Page 1 of 2 pages 1 Scope This standard specifies the principal properties of the magnetic tape used for the 19-mm type D-2 composite digital television
2、format. 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 f 1C - Relative humidity: (50 *
3、2)% - Barometric pressure: 96 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: - Tape tension: Stabilized to the conditions specified in 2.2 Wound on a reel at a tension of 0.6 N to 1.5 N
4、 3 Television tape specifications 3.1 Base The base material shall be polyester or equivalent. 3.2 Width The tape width shall be 19.01.0 mm f 0.015 mm. 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 calibr
5、ated microscope or profile projector having 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. Copyright 02003 by THE SOCIEIY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale
6、 Ave., White Plains, NY 10607 (914)761-1100 Approved February 7,2003 CMPTE 246M-2003 3.3.1 Measurement of delta width shall be over a tape length of 230 mm with a tension of 0.7 N. 3.4 Reference edge straightness The reference edge straightness maximum deviation is 6 pm p-p. 3.4.1 Edge straightness
7、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 115 mm from the first to second guide and 115 mm from the second to third guide. Edge measurements are averaged over 10-mm lengths and are made 5 mm from the midpoint
8、between the first and second guide, towards the first guide. 3.5 Tape thickness 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
9、 be greater 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 ta
10、pe used should have a coating of metal particles or equivalent. 3.8.1 The coating coercivity shall be a class 1500 oersted (120,000 Nm), as measured by a 50- or 60-Hz BH meter or vibrating sample magnetometer (VSM). 3.8.2 The magnetic particles shall be longitudinally oriented. Annex A (informative)
11、 Bibliography ANSVSMPTE 245M-1993, Television Digital Recording - 19-mm Type D-2 Composite Format -Tape Record SMPTE 244M-2003, Television - System WNTSC Composite Video Signals - Bit-Parallel Digital Interface SMPTE 247M-2003, Television Digital Recording - 19-mm Type D-2 Composite Format - Helical
12、 Data and Control Records SMPTE 248M-2003, Television Digital Recording - 19-mm Type D-2 Composite Format - Cue Record and Time and Control Code Record SMPTE EG 20-1997, Tape Transport Geometry Parameters for 19-mm Type D-2 Composite Format for Television Digital Recording SMPTE EG 21-1997, Nomenclature for Television Digital Recording of 19-mm Type D-1 Component and Type 0-2 Composite Formats ITU-R BT.470-6 (1 1/98), Conventional Television Systems Page 2 of 2 pages
