1、 CENELEC ENxb0094-2 95 = 3404583 OLb5384 140 BRITISH STANDARD Magnetic tape sound recording and reproducing systems Part 2. Calibration tapes The European Standard EN 60094-2 : 1995 has the status of a British Standard Product code 00630175 ICs 33.160.30 BS EN 600942 : 1996 BS 6288 : Part 2 : 1995 I
2、EC 942 : 1994 (Imluding corrigendum, March 1995, to IEC 942 : 1994) CENELEC EN*b0094-2 95 m 3404583 OLb5385 087 m AmdNo. Date BS EN 600942 : 1996 Text afected Committees responsible for this British Standard The preparation of this British Standard was entnisted to Technical Committee EPy60, Recordi
3、ng, upon which the following bodies were represented: Association of professional Recording SeMces Ltd. Audio Engineering Society British Broadcasting Corporation British Jhemabgraph, Sound and Television Society British Tape industry Association Federation of the Electronics industry ITVAssociaon (
4、TVA) National Counci for Educational Technology (NCET) Royal Photographic Society Royal Television Society This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards bard and comes into effect on 15 January
5、 O BSI 1996 1996 The following BSI references relate to the work on this standard: Committee reference EPUGO Draft for comment 90R2224 DC ISBN O 580 24955 7 CENELEC EN*b0094-2 95 W 3404583 0365386 TL3 W BS EN 600942 : 1996 Contents page Committees responsible Inside front cover National foreword ii
6、Foreword 2 Specification 1 Scope 3 2 Object 3 3 General requirements 3 4 5 6 Tapes for use at speeds of 38.1 cds (15 ids) and 19.05 cm/s (7 112 ds) Tapes for use at a speed of 9.53 cds (3 3/4 ids) 4 5 6 Tapes for use at a speed of 4.76 cds (1 718 ids) Annex A List of supplieis of calibration tapes o
7、f width 3.81 mm for use at a speed of 4.76 cds 7 O BSI 1996 i CENELEC EN*b0094-2 95 3404583 OLb5387 957 R BS EN 60094-2 : 1996 National foreword This British Standard has been prepared by Technical Committee EPU60 and is the English language version of EN 600942 : 1995 Magnetic tape sound recording
8、and repmducing systems Part 2 : Calibration tapes, published by the European Committee for Electrokchnical Standardization (CENELEC). It is identical with IEC 942 : 1994 and its corrigendum (March 1995), published by the International Electrotechnicd Commission (EX). The cross-reference of this stan
9、dard as Part 2 of the BS 6288 series has been retained to facilitate reference to other parts of the series. This British Standard supersedes BS EN 600942 : 1994 (BS 6288 : Part 2 : 1994), which is withdrawn. This edition does not reflect a full review or revision of the standard, which will be unde
10、rtaken in due course. BS 6288 consists of the following Parts: Part 1 (BS EN 600941) Part 2 (BS EN 600942) Part 3 Part 4 (BS EN 600944) Part 5 (BS EN 600945) Part 6 Part 7 (BS EN 600947) Part 8 Part 9 Part 10 Part 11 Cross-references Publication referred to IEC 941 : 1981) ISOR 266 : 19632) Specific
11、ation forgenerai conditions and requirmts Specification for calibration tapes Methods of masuring the chamtemstics of recording and reproducing equiprnent for sound on magnetic tape Mechanical magnetic tape properties Specification for electrical magnetic tape properties Sp 2) azimuth; 3) amplitude/
12、frequency response. Each section shall be recorded at a recording angle of 90“ i 1. relative to the edge of the tape. Over the frequency range used, all of the octave frequencies of the preferred ISO/R 266 frequencies, relative to 1 O00 Hz, shall be used. Additional frequencies shall be used from th
13、e one-third octave. If further frequencies are required, one-sixth octave shall be applied. Each section shall be announced and the official IEC languages are preferred. At the beginning of the tape, the standard tape speed to which the calibration refers, the characteristic to which the tape has be
14、en recorded and the date of recording shall be announced, for instance “IEC calibration tape for 38,l cm/s (15 inis) recorded to a 35 ps time constant in accordance with IEC Publication 94, first edition“. CENELEC EN*bOJJS9-2 75 = 3404583 0365373 380 W Page 4 EN 60094-2 : 1995 An announcement at the
15、 beginning of each section shall specify the content of that section: for the reference level section, the short-circuit flux per unit track width; and for the other sections, the short-circuit flux level relative to that of the reference level section; for example: - Reference level section: - Azim
16、uth section: 1 O00 Hz at 320 nWb1m. 1 O00 Ht at minus 10 dB. - Amplitude/frequency response section: 1 O00 Hz at minus 20 dB. Announcements shall be recorded at a peak level slightly lower than the recorded signals in that section. An instruction sheet shall accompany each tape. It shall specify the
17、 relevant IEC publi- cations and the date of production of the calibration tape and shall include at least a description of the contents of the tape. 4 lapes for use at speeds of 38,1 cmls (15 In1s) and 19,05 cm1s (7 112 Ink) 4.1 Reference level section A signal at the reference frequency, preferabl
18、y of 1 O00 i 30 Hz, shall be recorded at a specified short-circuit flux per unit track width, preferably of 320 nWb/m, and having a distortion of less than or equal to 1 %. The duration of the signal shall be at least 30 s. The tolerance of the reference flux of commercially available calibration ta
19、pes shall not exceed 15 %. 4.2 Azimuth section Signals of 1 O00 Hz and 10 O00 Hz shall be recorded. The 1 O00 Hr signal shall be recorded at a specified short-circuit flux per unit track width, preferably of 100 nWb1m. The duration of the signal shall be at least 10 s and 60 s respectively. 4.3 Ampl
20、itude/frequency response section The following signals shall be recorded, preferably in the order shown. The first 1 O00 Hz signal, recorded at a specified short-circuit flux per unit track width of at least 32 nWblm, shall be the reference signal. Each signal shall have a duration of at least 10 s.
21、 The maxi- mum deviation in the frequencies shown shall be k3 %. 1 O00 Hz, 313 Hz. 40 Hz, 50 Hz, 63 Hz. 80 Hz*, 100 Hz, 125 Hz. 250 Hz, 500 Hz, 1 O00 Hz. 2 O00 Hz, 4 O00 Hz, 6 300 Hz. 8 O00 Hz, 10 O00 Hz. 12 500 Hz, 14 O00 Hz. 16 O00 Hz, 18 O00 Hz. 20 O00 Hz, 1 O00 Hz. Optional CENELEC EN*b0074-2 75
22、 3404583 03b5372 217 Page 5 EN 60094-2 : 1995 The deviation of the recorded levels, relative to the short-circuit flux response curve as given in IEC 94-1, shall not exceed I0.5 dB for signals up to and including 10 O00 Hz nor il dB for signals over 10 O00 Hz. The level fluctuations up to and includ
23、ing 10 O00 Hz shall not exceed 0,5 dB and shall not exceed 1 dB over 10 O00 Hz, measured with an appropriate track per reproduction channel. 5 Tapes for use at a speed of 933 cmis (3 314 Ink) 5.1 Reference level section A signal at the reference frequency, preferably of 315 f 10 Hz, shall be recorde
24、d at a specified short-circuit flux per unit track width, preferably of 250 nWb/m, and having a distortion of less than or equal to 1 Yo. The duration of the signal shall be at least 30 s. The tolerance of the reference flux of commercially available calibration tapes shall not exceed 15 Yo. 5.2 Azi
25、muth section Signal of 315 Hz and 10 O00 Hz shall be recorded. The 315 Hz signal shall be recorded at a specified short-circuit flux per unit track width, preferably of 50 nWb1m. The duration of the signals shall be at least 1 O s and 60 s respectively. 5.3 Amplitude/frequency response section The f
26、ollowing signals shall be recorded, preferably in the order shown. The first 315 Hz signal, recorded at a specified short-circuit flux per unit track width of at least 25 nWb/m, shall be the reference signal. Each signal shall have a duration of at least 1 s. The maximum deviation in the frequencies
27、 shown shall be i3 %. 315 Hz, 31,s Hz, 40 Hz, 50 Hz, 63 Hz, 80 Hz*: 100 Hz, 125 Hz, 250 Hz, 315 Hz, 500 Hz, 1 O00 Hz. 2 O00 Hz. 4 O00 Hz, 6 300 Hz, 8 O00 Ht, 10 O00 Hz, 12 500 Hz, 14 O00 Hz, 16 O00 Hz, 18 O00 Hz, 20 O00 Hz, 315 Hz. The deviation of the recorded levels, relative to the short-circuit
28、flux response curve as given in IEC 94-1, shall not exceed 10,5 dB for signals up to and including 8 O00 Hz nor fl dB for signals over 8 O00 Hz. The level fluctuations up to and including 8 O00 Hz shall not exceed 0.5 d6 nor 1 d6 over 8 O00 Hz, measured with an appropriate track per reproduction cha
29、nnel. Optional CENELEC EN8b0094-2 95 3404583 036.5393 353 Page 6 EN 60094-2 : 1995 6 Tapes for use at a speed of 4,76 cm/s (1 7/8 Inis) 6.1 Reference level section A signal at the reference frequency, preferably of 315 f 10 Hz, shall be recorded at a specified short-circuit flux per unit track width
30、, preferably of 250 nWb/m, and having a distortion of less than or equal to 3 %. The duration of the signal shall be at least 30 s. The tolerance of the reference flux of commercially available calibration tapes shall not exceed 15 %. 6.2 Azimuth section Signal of 315 Hz and 10 O00 Hz shall be recor
31、ded. The 315 Hz signal shall be recorded at a specified short-circuit fux per unit track width, preferably of 25 nWb/m. The duration of the signal shall be at least 10 s and 60 s respectively. 6.3 Amplitude/frequency response section The following signals shall be recorded, preferably in the order s
32、hown. The first 315 Hz signal, recorded at a specified short-circuit flux per unit track width of at least 25 nWb/m, shall be the reference signal. Each signal shall have a duration of at least 10 s. The rnaxi- mum deviation in the frequencies shown shall be k3 %. 315 Hz, 31,s Hz, 40 Hz, 50 Hz, 63 H
33、z, 80 Hz, 100 Hz, 125 Hz, 250 Hz, 315 Hz, 500 Hz, 1 O00 Hz, 2 O00 Hz, 4 O00 Hz, 6 300 Hz, 8 O00 Hz, 10 O00 Hz, 12 500 Hz, 14 O00 Hz, 16 000 Hz, 18 O00 Hz, 20 O00 Hz. 315 Hz. The deviation of the recorded levels, relative to the short-circuit flux response curve as given in IEC 94-1, shall not exceed
34、 10,5 dB for signals up to and including 6 300 Hz and shall not exceed fl dB from 6 300 Hz up to 14 O00 Hz. The level fluctuations up to and including 6 300 Hz shall not exceed 0.5 dB nor 1 dB over 6 300 Hz, measured with an appropriate track per reproduction channel. Optional I CENELEC ENMb0094-2 9
35、5 3404583 0365394 09T Page 7 EN 60094-2 : 1995 Annex A List of suppliers of calibration tapes of width 3.81 mm for use at a speed of 4.76 cm/s Over the last few years it has become evident that, due to differences in the primary measurement of tape flux and the change in performance of replay heads
36、based on new technology, calibration tapes from different sources have led to divergent results when played on any one particular player. Steps have been taken to unify the methods of measurement and these steps have resulted in a unified calibration tape which conforms to the established recording.
37、character- istics as specified in IEC Publication 94-1. Calibration tapes made in accordance with these unified methods of measurement shall be identified by the words “IEC(Prague)l981“ and can be obtained on open reel and/or in cassette housings from the following suppliers: A-Bex Laboratories lnc.
38、 2-1 1-15 Minami - Cho, Kokubunji Tokyo 185 - Japan Guiyang 4th Radio Factory Tong Xin Road Guiyang Guizhon - province China AGFA-Gevaert AG Kistlerhofstr. 75 D-8000 Mnchen 70 Germany B.A.S.F. - AG Gottlieb Daimlerstrasse 1 O Postfach 5146 D-6800 Mannheim - Germany Sony Corporation 7-35 Kitashinagaw
39、a 6 - chome Shinagawa - Ku Tokyo 141 - Japan Sales aae nL Kokusai Corporation 8-7 Higashi - Ikebukuro 4 - chome Toshima - Ku Tokyo 170 - Japan Teac Corporation 3-7-3 Naka - Cho Musashino Tokyo 180 - Japan The list of suppliers may be extended after approval of the German and Japanese National Commit
40、tees. To do so, these two Committees shall execute the necessary measurements on the same primary calibration tapes sent to them, exchange results and arrive at a unanimous conclusion. The German and Japanese National Committees shall make available the detailed results of these measurements to othe
41、r National Committees on request. - CENELEC ENsb0094-2 95 = 3404583 0365395 T2b BS EN 6094-2 : 1996 .A List of references See national foreword. O BSI 1996 BS EN 6094-2 : 1996 BS 6288 : IEC 942 : 1994 I Part 2 : 1995 BSI 389 Chiswick High Road London w4 4AL 9601-6-0.35k- RTL BSI - British Standards
42、Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Contract requirements .A British Standard does not purport to include ail the necessary pr
43、ovisions of a contract. Users of British Standards are responsible for their correct application. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. Any person who hds an inaccuracy or amb
44、iguity while using this British Standard should bring it to the attention of the Fax: 0181 996 7048. Subscribing members of BSI are kept up to date with standards developments and receive subsantial discounts on the purchase price of standards. For details of these and other benefits contact Custome
45、r Services, Membership at Chiswick Tel O181 996 7002; Fax: 0181 996 7001. Copyright Copyright subsists in ail BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1
46、988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means - electronic, photocopying, recording or otherwise - without prior written pennission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary deta
47、ils such as symbols, and size, type or grade desgnahons. If these dew are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Jf permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager, BSI, 389 Chiswick High Road, London W4 4AL ISBN O 680 24965 7 EPU
