SIST EN 60094-3:1999/A3:1999

SLOVENSKI STANDARD
01-april-1999
Magnetic tape sound recording and reproducing systems -- Part 3: Methods of
measuring the characteristics of recording and reproducing equipment for sound
on magnetic tape - Amendment A3 (IEC 60094-3:1979/A3:1996)
Magnetic tape sound recording and reproducing systems -- Part 3: Methods of
measuring the characteristics of recording and reproducing equipment for sound on
magnetic tape
Systeme für Tonaufzeichnung und -wiedergabe auf Magnetband -- Teil 3: Meßverfahren
zur Bestimmung der Eigenschaften von Aufnahme- und Wiedergabegeräten
Systèmes d'enregistrement et de lecture du son sur bandes magnétiques -- Partie 3:
Méthodes de mesure des caractéristiques des matériels d'enregistrement et de lecture
du son sur bandes magnétiques
Ta slovenski standard je istoveten z: EN 60094-3:1996/A3:1996
ICS:
33.160.30 Avdio sistemi Audio systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEI
NORME
I EC
INTERNATIONALE
94-3
INTERNATIONAL
STANDARD
AMENDEMENT 3
AMENDMENT3
1996-02
Amendement 3
Systèmes d'enregistrement et de lecture
du son sur bandes magnétiques -
Troisième partie:
Méthodes de mesure des caractéristiques des
matériels d'enregistrement et de lecture du son
sur bandes magnétiques
Amendment 3
Magnetic tape sound recording and
-
reproducing systems
Part 3:
Methods of measuring the characteristics of
recording and reproducing equipment for sound
on magnetic tape
de reproduction réservés — Copyright — all rights reserved
© CEI 1996 Droits
Genève, Suisse
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Commission Electrotechnique Internationale
International Electrotechnical Commission PRICE CODE
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For price, see current catalogue

- 3 -
94-3 Amend. 3 ©IEC:1996
FOREWORD
This amendment has been prepared by sub-committee 60A: Sound recording, of IEC
technical committee 60: Recording.
The text of this amendment is based on the following documents:
FDIS Report on voting
1008/17/RVD
60A/177/FDIS
Full information on the voting for the approval of this amendment can be found in the
repo rt on voting indicated in the above table.
Page 9
1 Scope
Delete, in the last sentence "(in preparation)".
Page 15
8.3 Interface data
Page 17
"dB" at the end of the sentence.
Fifth line: delete
Sixth line: replace " Uo" by "UR"
Tenth line: add the following lines:
0 V
Rated reproducing output voltage U
The r.m.s. output voltage across the rated load impedance when reproducing the
reference level section from the specified calibration tape. This parameter specifies
the setting of adjustable reproduce gain controls, if available.
Page 19
Reproducing performance
9.2.2
by:
Replace "Signal/noise ratio (electronic noise)"
Reference level-to-noise ratio of reproducing chain (electric noise).

94-3 Amend. 3 © IEC:1996 - 5 -
Replace "Voltage output level at specified total harmonic distortion (preferably at 1 %
and 5 %)" by:
Voltage output level at specified total harmonic distortion (electronic).
Page 21
9.2.3 Overall performance
Replace the fifth line by:
12.3.2.1
Signal level-to-noise ratio using the specified reference tape
Add after the fifth line:
Maximum recording level-to-noise ratio using the specified 12.3.2.2
reference tape
Page 23
Subclause 10.2
Delete the note.
Page 25
11.1.1 Mean deviation from standardized reproduce speed
Replace the note under method B, by:
NOTES
1 It is recommended that fo = 3 150 Hz.
2 See also appendix B of IEC 386.
Delete, on page 27, the note under method C.
Page 27
11.1.2 Reproduce speed drift
Replace the existing subclause by the following new subclause:
Definition
The slow variation in speed caused by the simultaneous variation of tape length on the
supply and take-up reel when the equipment is in the reproduce mode.

- 7 -
94-3 Amend. 3 © IEC :1996
Method
For measurement on reel-to-reel equipment, the largest permissible reels shall be used.
A full reel is placed on the supply spindle, and an empty reel is placed on the take-up
spindle of the equipment. A full-width sinusoidal signal at the beginning of the full reel is
1 Hz, is measured.
played in the reproduce mode, and the reproduced frequency, f
Supply and take-up reels are then interchanged, and the sinusoidal signal is reproduced
f2 Hz.
again, this time resulting in a reproduced frequency of
For measurement on cassette equipment, a full-length cassette shall be used. The full reel
is placed on the supply spindle. A full-width recorded sinusoidal signal is played in the
f1 Hz, is measured.
reproduce mode and the reproduced frequency
Without rewinding, the cassette is turned over (A to B side) and the signal is played again,
2 Hz.
this time resulting in a reproduced frequency f
NOTES
It is recommended that the sinusoidal signal, when reproduced at the relevant standard speed, results
in a reproduced frequency of 3 150 Hz.
2 See also appendix B of IEC 386.
2(ff — f2)
Drift: x 100 %
Result
f^ + f2
NOTE - Methods A, B and C of 11.1.1 may also be adopted to measure this parameter.
Page 29
Steady-state tape tension (reel-to-reel equipment only)
11.2
Delete the note of the last paragraph of this subclause.
11.3.1 Maximum start time to record/reproduce speed
Replace the existing subclause by the following new subclause:
Definition
The maximum time that has elapsed between the operation of starting the device and the
moment that the tape speed being increased from zero to a reproduce speed that gives a
wow-and-flutter reading equal to the nominal value.
Method
A test frequency of 3 150 Hz recorded on the equipment throughout the full reel of tape
shall be reproduced on the equipment from the beginning, the middle and the end of the

- 9 -
94-3 Amend. 3 © IEC:1996
supply reel. The reproduced test signals shall be fed to a wow-and-flutter meter according
to IEC 386 and its amendment 1 and the output from this wow-and-flutter meter fed to a
graphic recorder. The time taken from the operation of starting the device to when the
trace on the recording assumes the nominal value is noted.
Result
The maximum time derived from various readings shall be quoted.
Page 33
12.2 Reproducing performance
Replace the first sentence of the existing subclause by the following:
If adjustable reproduce gain controls are provided on the equipment, they shall be
when reproducing the reference level section
adjusted to give the rated output voltage U0
of the appropriate calibration tape.
Page 35
12.2.2 Signal/noise ratio of reproducing chain (electronic noise)
Replac
...