1、 STD-BSI BS EN bOO74-5-ENGL 1994 Lb24bbS 0587784 487 H BRITISH STANDARD Magnetic tape sound recording and reproducing systems Part 5. Specification for electrical magnetic tape properties The European Standard EN 6094-6 : 1993 with the incorporation of amendment Al : 1996 has the status of a British
2、 Standard ICs 33.160.30 BS EN 60094-5 : 1994 BS 6288 : Part 6 : 1989 Incorpomting Amend- amendment Al was approved by CENELEC on 1996-03-06. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a n
3、ational standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A versio
4、n in any other language made by transhion under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national elech-otechnical committees of Auslxh, Belgium, Denmark, Finland, kance,
5、 Germany, Greece, Iceland, Ireland, Iaiy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central
6、 Secretariat: rue de Stassart 36, B-1060 Brussels O 1993 Copyright reserved to CENELEC members Ref. No. EN 600942) : 1993 +Al : 1996 E STD-BSI BS EN b0074-5-EEL 377q Lb24bb7 5A78A O22 = EN6009416:1993 Issue 1, February 1997 -latest date of pubicaon of anidenticalnalionalstmdard (dop) 1994-1Qol -late
7、st date of withdrawal of dwndhal- (dow) - Annexes designated nonnative are part of the body of . thestandardhInthisdard,annexZAisnonnative. Foreword As a umeqwme of the IEC-CENELEC Agreement, HD311.6Sl: l this may be separately quoted in the manufacturers published data, together with any relevant t
8、est results andlor curves. I 4.76 IEC I 4.76 IECII 4.76 IECIII 4.76 IEC IV 4.76 - 9.53 - 19.0s - TABLE IV Y348M UWW CS301 MJ507A cmz C2MZ C2MZ Table of maximum output levels specijied for domestic I E C primary reference tapes width 3.81 6.31 6.31 * = not specified nie alternative nferencc bias meth
9、od shall be used according to 2.6.lb). The amount below the obtainable maximum at 6.3 kHz output shall be 4 dB at 9.5 ds. Nntr. - 3.81 mm widc domestic tape types IEC 1. II. 111 and IV arc described in Table V. Il SECTION THREE - PARAMETERS TO BE MEASURED Mcasirrrrncni cotiditions : al For the purpo
10、se of this standard. ali professional tapes shall be measured using their own value of conventional test bias. In addition. measurements may be made using a value of reference bias derived from the relevant reference tape. h) For the purpose of this standard. all domestic tapes shall be measured usi
11、ng conventional test bias. IEC page 21) STD-BSI BS EN bOOS4-5-ENGL 1994 m Lb24bb9 0587777 035 Issue 2, February 1997 Page 9 EN 60094-6 : 1993 However if additional optional measurements are made using optimum bias for the tape under test, the bias value shall be determined from the bias current whic
12、h will produce the same diffeience between its maximum output levels at 10 kHz and 315 Hz (1 kHz for 19.05 ds tape speed) as that specified for the relevant pimary reference tape (see Table IV). This bias value shall be expressed in terms of bias ratio (see Subclause 3.1). It should be noted that th
13、e specified difference between the maximum output levels shall be determined with measuring equipment having accurately calibrated electrical characteristics : 1) The amplituddfrequency response ” section of the calibration tape. used for adjusting the reproducing chain shall not vary from the absol
14、ute value, or if there is any deviation this shall be known. 2) The reference level contained on the calibration tape used shall not vary from the absolute value, or if there is any deviation, this shall be known. Nofe. - The absolute values for 3.81 mm wide calibration tapes arc represented by the
15、calibration tapes b) if three drop-outs with h 3 2 occur within 1 s, three points shall be added to the h, value ; c) if four or more dropouts with h Z 2 occur within 1 s, four points shall be added to the h , value. nie sum of the resulting h, values of Items i), ii) and iii) shall be expressed in
16、four categories as follows : - category 1: 2 S h, S 4 - category 2: 5 S h, d 8 - category 3: 9 d h, s 12 - category 4: 13 d h, The audiofrequency current in the recording head shall be as specified in the method of Sub- clause 3.3. Measurement of drop-out annoyance shall be made at the output of the
17、 replay chain, using suitable dropout annoyance measuring equipment (see Appendix B). Dropout annoyance shall be measured using a frequency of 3 150 Hz and the value of conven- tional test bias for the tape under test. The test shall be camed out for 50 successive samplings of M s at the rated tape
18、speed. Measurements at the same wavelength, using a multiple of the rated speeds. may be made with suitable equipment. Tracks to be used for drop-out annoyance: a For professional tapes 6.30 mm wide Measurement of dropout annoyance shall be camed out on both tracks using the head configuration speci
19、fied in table II (see Sub-clause 2.2). IEX page 451 20 STD-BSI BS EN bOOSY-5-ENGL 1794 Lb2qbbS 0587830 3T BS6288 : Part5 : 1989 6) For domestic mpes 6.30 mm and 3.81 mm wide Measurement of drop-out annoyance shall be camed out on both outer and one inner track using the head configuration specified
20、in Table 11. Measurements : a) For professional tapes 6.30 mm wide Drop-out annoyance should be measured as indicated in Table VI. b) For domestic tapes 6.30 mm wide Drop-out annoyance should be measured as indicated in Table WI. c) For domestic tapes 3.81 mm wide Drop-out annoyance should be measur
21、ed as indicated in Table VIU. Result : nie drop-out annoyance is calculated as being the number of h, values per category (ni to n, where nl is the number of h, values in category 1, etc.) expressed as a percentage of the 50 successive samplings : - category 1 = 2 x 100 = percentage of h, values - c
22、ategory 2 = 5 x 100 = percentage of h, values - category 3 = - x 100 = percentage of h, values - category 4 = 5 x i00 = percentage of h, values n 50 50 n3 50 50 SECTION FOUR - INFORMATION TO BE SUPPLIED BY THE MAGNETIC TAPE MANUFACTURER Information supplied by the manufacturer shall fall into two di
23、stinct categories : a) mandatory information to be clearly shown in the presentation of technical data: b) optional infomation which may be given at the discretion of the manufacturer. 4.1 Recommended form for published data Where data obtained from tests in accordance with this standard. or with an
24、y other relevant IEC publication, form part of publicity material. they shall be clearly set apart and shall be preceeded by the following particulars : 1) The number of the relevant IEC publication. 2) Makers name or trade-mark. 3) Makers type reference and/or description. 4) The applicable IEC typ
25、e number for 3.81 mm wide domestic cassette tape shall be stated on cassette labels andcr cassette library insert cards and in published technical data. The IEC type number used shall be in accordance with IEC Publication 94-7. 21 (IEC page 471 STD-BSI BS EN bOOS4-5-ENGL 1994 Lb24bb7 0587811 235 m D
26、escription IEC type No. I Tapes with recording properties similar to the IEC I reference tape Example: FeQz (normal) or equivaknt Tapes with recording properties similar to the I EC I1 reference tape Example : CrO, (chrome) or equivalent Tapes with recording properties similar to the IEC III referen
27、ce tape Example: FeCr (fcrro-chrome) or equivalent Tapes with recording properties similar to the IEC IV reference tape Ewmplc : Fe (metal) or equivalent II 111 IV BS 6288 : Part 5 : 1989 Time ccmstants toausea(irr) II t2 im 3 180 .- m 3 180 m 3 180 70 3 18D 5) Base material (a generic name is suffi
28、cient). 6) Total tape thickness. 7) Recommended applications. 8) Type of calibration and reference tapes used. Characteristics of magnetic tapes shall be measured in accordance with the technical require- Tables VI. VI1 and VI11 state the recommended parameters to be quoted in published data. ments
29、quoted in Section Two and the parameters quoted in Section Three. . IEC page 49 J 22 STD-BSI BS EN b0099-5-ENGL 1994 lb24bb9 0587832 171 Issue 2, February 1997 Page 23 EN 600946 : 1993 TABLE VI Recommendrd parameters to be quoted in published dato for professional tap 6.30 mm wide II SubchUSC 3.10)
30、Bias ntio 3.2 3.2 3.2 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.9 3.9 3.9 3.9 3.10 Muimum output level for 3 % third humonic distonion Maximum output kvcl for tape tramtion haximum output level for 5% intamodulation distortion Relative tape sensitivity Ditto Ditto Ditto Ditto Dit
31、to Ditto Reverse relative tape sensitivity Ditto Reference level to bias ese ntio Si to bias noise ratio Rderemc kvel to d.c. noise ntio Reference level to print ratio Erasing attenuation Shon tem uniformity variations Ditto Long term uniformity variations Ditto Ditto Drop-out annoyance deasurement
32、frequency Hz) 76.2 cmls B* A A A B B B A B A B A - B A A B A A B B B B B B 38.1 Cmk A* A A A B B B A B A B A - B A A B A A B B B B B B - L9.W emls B* A A A B B B A B A A B B - A A B A A B B B B B B A = mandatory parameter B = optiond parameter Naes I. The measuring heads shall be in acamiane with It
33、em e) Sub-daw 2.2. A* = mandatory tape speed B* = optional tape speed 2- Maximum output level and relative tape sensitivity curves may be optionally measured ar various bias levels. 3. For all tape measurements, the reproducing chain shall be aligned using the relevant calibration tape having the 1
34、EC 1 flux response characteristic specified in Claw IS of IEC Publication 94-1. If optional measurements are made. using the IEC 2 characteristic. this shall be stated. 4. If tape measurements arc made at the optional tape speeds of 76.2 cmis and 19.05 ds. the parameters indicated with the letter A“
35、 shall be quoted. IEC page Sl STD-BSI BS EN b0094-5-ENGL 3974 m 3b24bb7 0587833 O08 W Page 24 EN6oo9ps:1!393 Issue 2, February 1997 TABLE VI1 Recommended parameters to be quoted in published data for domestk tape and unrecorded tape used for commercial tape records (6.30 mm wide) - Sub-clause 3.1 b)
36、 Bias ratio 3.2 Maximum output level for 3% third harmonic distortion 3.2 3.2 Maximum output level for tape saturation Maximum output level for 5% intermodulation distortion 3.3 Relative tape sensitivity 3.3 Ditto 3.3 Ditto 3.3 Ditto 3.3 Ditto 3.3 Reverse relative tape sensitivity 3.4 3.5 3.7 3.8 Er
37、asing attenuation Reference level to bias noise ratio Signal to bias noise ratio Reference level to print ratio 3.Y Short term uniformity variations 3.Y Long term Uniformity variations 3.10 Dropout annoyance Measurement frequency (Hz) 315 10 O00 Any frequency 315 3 150 6300 10 o00 12 Mo 10 O00 - 3 1
38、5 cio0 3 15 loo0 3 150 315 3 150 19.05 cmls B* See Note 5 A A B A A B A A B A A A A B B B - 9.53 cmls A* ice Note 5 A A B A A B A A B A A A A B B B B 4.76 emls B. ke Note 5 A A B A A B A A B A A A A B B B B A = mandatory parameter B = optional primeter Nores 1. The measuring heads shall be in accord
39、ance with Item e) of Sub-clause 2.2. A* = mandatory tape speed B* = optional tape speed 2. Maximum output level and relative tape sensitivity curves mav be optionally measured at various bias levels. 3. For all tape measurements. the reproducing chain shall be aligned using the relevant calibration
40、tape having the flux 4. if tape measurements arc made at the optional tape speeds of 19.05 cmls and 4.76 ds. the parameters indicated mth 5. If optional measurements are made using the optimum bias for the tape under test. its bias ratio shall k quoted (sce respma characteristic specified in Clause I5 of IEC Publication 94-1. the letter “A“ shall k quoted. Suhclause 3.1. Item h). IEC page 531
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