EN 60094-5:1993
(Main)Magnetic tape sound recording and reproducing systems - Part 5: Electrical magnetic tape properties
Magnetic tape sound recording and reproducing systems - Part 5: Electrical magnetic tape properties
Applies to non-perforated magnetic tape used for professional and domestic analogue sound recording and reproduction. Lists and defines the characteristics, methods of measurement and equipment necessary to determine the electrical properties of magnetic tapes. Will also enable users of magnetic tapes to compare the technical product data of different manufacturers, produced in accordance with this standard.
Systeme für Tonaufzeichnung und -wiedergabe auf Magnetband - Teil 5: Elektrische Eigenschaften von Magnetbändern
Systèmes d'enregistrement et de lecture du son sur bandes magnétiques - Partie 5: Propriétés électriques des bandes magnétiques
S'applique aux bandes magnétiques non perforées à usages professionnels et grand public pour l'enregistrement analogique et la lecture du son. Etablit les caractéristiques électriques des bandes magnétiques et définit les méthodes et les matériels de mesure nécessaires. Permet aux utilisateurs de bandes magnétiques de comparer les informations techniques données, conformément à la présente norme, par divers fabricants.
Magnetic tape sound recording and reproducing systems -- Part 5: Electrical magnetic tape properties (IEC 60094-5:1988)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-april-1999
Magnetic tape sound recording and reproducing systems -- Part 5: Electrical
magnetic tape properties (IEC 60094-5:1988)
Magnetic tape sound recording and reproducing systems -- Part 5: Electrical magnetic
tape properties
Systeme für Tonaufzeichnung und -wiedergabe auf Magnetband -- Teil 5: Elektrische
Eigenschaften von Magnetbändern
Systèmes d'enregistrement et de lecture du son sur bandes magnétiques -- Partie 5:
Propriétés électriques des bandes magnétiques
Ta slovenski standard je istoveten z: EN 60094-5:1993
ICS:
33.160.30 Avdio sistemi Audio systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
CEI
NORME
INTERNATIONALE IEC
94-5
INTERNATIONAL
édition
Première
STAN DARD
First edition
1988-03
Systèmes d'enregistrement et de lecture du son
sur bandes magnétiques —
Cinquième partie:
Propriétés électriques des bandes magnétiques
Magnetic tape sound recording and reproducing
systems —
Part 5:
Electrical magnetic tape properties
© IEC 1988 Droits de reproduction réservés — Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
y compris la photo- procédé, électronique ou mécanique, including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur writing from the publisher.
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Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
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V
PRICE CODE
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Pour prix, voir catalogue en vigueur
• • For price, see current catalogue
3 –
94-5(1) © IEC –
CONTENTS
Page
FOREWORD 5
PREFACE
SECTION ONE - GENERAL
Clause
1.1 Scope
1.2 Object
SECTION TWO - TECHNICAL REQUIREMENTS AND INFORMATION CONCERNING TESTING CONDITIONS
2.1 Standard atmospheric conditions
2.2 Mechanical characteristics of tape transports
2.3 Electrical characteristics of test equipment
Calibration tape 15
2.4
2.5 Reference tape 15
2.6 Bias 17
2.6.1 Reference bias 19
2.6.2 Conventional test bias
SECTION THREE - PARAMETERS TO BE MEASURED
Bias ratio 23
3.1
3.2 Maximum output level 25
3.3 Relative tape sensitivity 31
3.4 Reference level to bias noise ratio 33
3.5 Signal to bias noise ratio
3.6 Reference level to d. c. noise ratio
3.7 Reference level to print ratio
3.8 Erasing attenuation (under consideration)
3.9 Uniformity variations
3.10 Drop-out annoyance
SECTION FOUR - INFORMATION TO BE SUPPLIED BY THE MAGNETIC TAPE MANUFACTURER
4.1 Recommended form for published data
APPENDIX A - Equipment noise correction
APPENDIX B - Measuring means
APPENDIX C - Intermodulation distortion measuring equipment
94-5(1) © IEC — 5 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
MAGNETIC TAPE SOUND RECORDING AND REPRODUCING
SYSTEMS
Part 5: Electrical magnetic tape properties
FOREWORD
The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all the
1)
National Committees having a special interest therein are represented, express, as nearly as possible, an international consen-
sus of opinion on the subjects dealt with.
rnational use and they are accepted by the National Committees in that sense.
2) They have the form of recommendations for inte
In order to promote international unification, the I E C expresses the wish that all National Committees should adopt the text
3)
of the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence between the
IEC recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter.
The I E C has not laid down any procedure concerning marking as an indication of approval and has no responsibility when an
4)
item of equipment is declared to comply with one of its recommendations.
PREFACE
This standard has been prepared by Sub-Committee 60 A : Sound Recording, of I E C Technical Committee No. 60 : Recording.
The text of this standard is based on the following documents :
Six Months' Rule Report on Voting
60 A (CO) 88 and 88 A
60 A (CO) 71
60A(CO)116
60A(CO)114A
Full information on the voting for the approval of this standard can be found in the Voting Reports indicated in the above table.
IEC Publication 94 and its supplements are under revision. The new IEC Publication 94 will be issued in several parts, of
which this is Part 5.
It will have the following parts :
Part 1: General conditions and requirements
General: electrical requirements for the magnetic tape recording and reproducing systems; mechanical requirements for
the magnetic tape; tape identification; programme identification (Fourth edition, 1981).
Part 2: Calibration tapes
Minimum requirements for calibration tapes for making adjustments and comparative assessments of the reproducing
performance (First edition, 1975).
(First edition,
Part 3: Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape
1979).
Part 4: Mechanical magnetic tape properties
Characteristics to be specified and relevant methods of measurement. Equipment to be used to determine the mechanical
properties of magnetic tapes (First edition, 1986).
Part 5: Electrical magnetic tape properties
Characteristics to be specified, methods of measurement and equipment to be used for the determination of the electrical
properties of magnetic tape for analogue sound recording and reproduction (object of this standard).
IEC — 7
94-5(1) ©
Part 6: Reel-to-reel systems
Mechanical requirements and dimensions, including reels, hubs and relevant track allocations (First edition, 1986).
Part 7: Cassette for commercial tape records and domestic use
Mechanical requirements and dimensions, including track allocation (First edition, 1986).
Part 8: Eight-track magnetic tape cartridge for commercial tape records and domestic use
Mechanical requirements and dimensions, including track allocation (First edition, 1987).
Part 9: Magnetic tape cartridge for professional use
Mechanical requirements and dimensions, including track allocation (First edition, 1988).
Part 10: Time and address codes (First edition, 1987)
Part 11: Address code for compact cassettes (First edition, 1988)
The following IEC publications are quoted in this standard:
Publication Nos. 50 (806) (1975) : International Electrotechnical Vocabulary (IEV), Chapter 806: Recording and reproduc-
tion of sound and video.
94-1 (1981) : Magnetic tape sound recording and reproducing systems, Part 1: General conditions and
requirements.
94-2 (1975): Pa rt 2: Calibration tapes.
94-6 (1985) : Part 6: Reel-to-reel systems.
94-7 (1986) : Part 7 : Cassette for commercial tape records and domestic use.
94-8 (1987) : Part 8 : Eight-track magnetic tape cartridge for commercial tape records and domestic
use.
9: Magnetic tape cartridge for professional use.
94-9 (1988) : Part
386 (1972) : Method of measurement of speed fluctuations in sound recording and reproducing
equipment.
651 (1979) : Sound level meters.
– 9 –
94-5(1) © IEC
MAGNETIC TAPE SOUND RECORDING AND REPRODUCING
SYSTEMS
Part 5: Electrical magnetic tape properties
SECTION ONE – GENERAL
1.1 Scope
This standard applies to non-perforated magnetic tape used for professional and domestic
analogue sound recording and reproduction.
1.2 Object
The object of this standard is to list and define the characteristics, methods of measurement
and equipment necessary to determine the electrical properties of magnetic tapes. It will also
enable users of magnetic tapes to compare the technical product data of different manufacturers,
produced in accordance with this standard.
SECTION TWO – TECHNICAL REQUIREMENTS
AND INFORMATION CONCERNING TESTING CONDITIONS
Standard atmospheric conditions
2.1
+5
Ambient temperature 2 °C
—5
Relative humidity 60 ± 15 %
Where necessary the tests shall be preceded by a period of conditioning to ensure that the test
specimen has reached equilibrium with the environment.
2.2 Mechanical characteristics of tape transports
a) Tape speed
The tape transports shall be capable of operating at the mandatory rated tape speed specified
in Table I.
TABLE I
Rated tape speeds
Tape application Speed (cm/s)
Professional 6.30 mm wide tapes 38.1 ± 0.2%
Domestic 6.30 mm wide tapes
9.53 ± 0.2%
Domestic 3.81 mm wide tapes 4.76 ± 0.2%
Other tape speeds may be required when additional optional information is given.
The tape speed fluctuations (wow and flutter) shall be not more than 0.15 % when measured
in accordance with I E C Publication 386.
IEC – 11 –
94-5(1) ©
b) Tape widths
Tape transports shall be capable of accommodating tape widths of 6.30 mm and/or 3.81 mm
with tolerances as specified in IEC Publication 94-1.
In addition tape transports may be used to accommodate the other tape widths and track
allocations specified in IEC Publication 94-1 or IEC Publications 94-6 to 94-9.
c) Tape guides
Tape guides shall be such as to ensure stability of measurement without affecting the inherent
characteristics of the tape.
d) Tape tensions
The tape tensions at the recording and replay heads shall be 1.0 ± 0.4 N for 6.30 mm wide
tapes and 0.5 ± 0.2 N for 3.81 mm wide tapes.
It is recommended that pressure pads should not be used.
e) Heads
For details see Table II and Appendix B.
TABLE II
Type of head
Replay
Erase Record
All tests All tests
All tests
Country
Type
of origin
of tape Track Gap Gap Track Relative part
Track
configuration configuration length length configuration of I E C
(µm) (gm) Publication 94
Two track
Professional Full Full 7 (A
3 A 6 Germany
y
width (B) ( ) two channel
mm wide width 18
Figure 8
Nos. 1 and 2
Full Full 7 (A Four track
Domestic
Japan
2 A 6
p
two channel
6.30 mm wide width width 2 (B) ( )
Figure 9
Nos. 1 and 3
4 (A 1 A Four track
Domestic Full Full
7 Japan
p
3.81 mm wide width width 1,5 (B) ( ) two channel
Nos. 1 and 2
A = mandatory
B = optional (for use when additional information is given at the discretion of the tape manufacturer)
Tape wrap
f)
The total angular displacement of the tape around the head. The tape wrap shall be 6 ± 2°
around each head.
(0.105 ± 0.035 rad)
The heads shall be set or adjustments provided so that :
the face of the head contacting the tape is parallel to the corresponding faces of the
i)
guides,
ii) the head is positioned so that the tape wrap is symmetrical with respect to the gap ;
the head gap alignment can be set accurately and rigidly. If the tape under test has a
iii)
coating thickness greater than that of the reference tape being used, the wrap symmetry
with respect to the gap shall be adjusted for maximum short wavelength response.
– 13 –
94-5(1) © IEC
2.3 Electrical characteristics of test equipment
a) Reproducing characteristic
The reproducing characteristic of the test equipment used shall give a flat frequency response
when reproducing the relevant calibration tape specified in I E C Publication 94-2.
b) Recording characteristic
The recording chain shall be adjusted to obtain constant current in the recording head over
the specified audio-frequency range.
The third harmonic distortion of both recording and reproducing chains shall be less than
throughout the measuring range, for signal levels which enable the maximum output
0.02 %
level to be obtained from the tape under test.
The weighted system noise (including hum) generated by the recording and reproducing
12 dB below the combined value of weighted system and tape noise.
chains should be at least
If this condition cannot be achieved a corrected noise value may be derived from the equip-
ment noise correction curve (see Appendix A).
Bias and erase requirements
c)
kHz or
The signal applied to the bias and erase heads shall be equal to a frequency of 80
0.05 % .
higher with an even harmonic distortion content of less than
A higher bias frequency is necessary when optional measurements are made at duplicating
tape speeds.
d) Output level meter
The meter used for all measurements shall be of the r.m.s. (square law) type specified in
I E C Publication 651.
e) Equipment for noise measurement
Bias noise shall be measured using a weighting network with the characteristics specified
i)
651.
for the A curve in IEC Publication
In addition, the weighting curve and quasi-peak meter specified in CCIR Recommenda-
may be used.
tion 468-3
D. C. noise shall be measured using a high-pass filter with the characteristics specified in
ii)
Sub-clause 3.6.
Drop-out annoyance equipment
f)
For the name and address of the manufacturer of suitable equipment see Appendix B.
Intermodulation distortion equipment
g)
Suitable measuring equipment is described in Appendix C.
h) Third harmonic distortion equipment
Third harmonic distortion shall be measured using a frequency analyzer or a filter.
i) Uniformity measurement equipment
The characteristics of the measuring equipment shall be in accordance with those specified in
Sub-clause 3.9.
– 15 –
94-5(1) © IEC
Calibration tape (IEV* 806-05-58)
2.4
A magnetic tape on which signals have been recorded, corresponding to a specified characteris-
tic, used to calibrate a reproducing chain.
Note. — A different calibration tape is required for each tape speed.
The type of calibration tape used for the purposes of this standard shall be stated and its format
shall be in accordance with I E C Publication 94-2.
Tape widths shall be in accordance with IEC Publication 94-1.
(IEV 806-05-59)
2.5 Reference tape
An unrecorded magnetic tape with spec
...
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