AS 3871.3-1994

1 - AS 3871.3-1994 MAGNETIC TAPE SOUND RECORDING AND REPRODUCING SYSTEMS - METHODS OF MEASURING THE CHARACTERISTICS OF RECORDING....
4 - PREFACE
6 - CONTENTS
7 - SECTION ONE - INTRODUCTION
7 - 1. Scope
7 - 2. Object
7 - SECTION TWO - GENERAL NOTES ON MEASUREMENTS
7 - 3. Information to be supplied by manufacturer of equipment
7 - 4. Identification
8 - 5. Technical description
8 - 6. Mechani cal characteristics
8 - 6.1 Space and support requirements during operation of equipment
8 - 6.2 Tape carrier and tape
8 - 6.3 Tape transport system
9 - 6.4 Tape heads
9 - 7. Electrical characteristics
9 - 7.1 Reproducing data
9 - 7.2 Recording data
9 - 8. Rated conditions
10 - 8.1 Rated environmental conditions
10 - 8.2 Rated power supply
10 - 8.3 Interface data
11 - 9. Performance claims
12 - 9.1 Mechanical performance claims
12 - 9.2 Electrical performance claims
12 - 9.2.1 General performance
12 - 9.2.2 Reproducing performance
13 - 9.2.3 Overall performance
13 - 9.2.4 Recording performance
14 - SECTION THREE - PRECAUTIONS TO BE TAKEN DURING MEASUREMENTS
14 - 10. Conditions of measurement
15 - SECTION FOUR - METHODS OF MEASUREMENT
15 - 11. Measurement of mechanical parameters
15 - 11.1 Record/reproduce speed
15 - 11.1.1 Mean deviation from standardized reproduce speed
16 - 11.1.2 Reproduce speed drift
17 - 11.1.3 Reproduce speed fluctuation (wow and flutter)
17 - 11.2 Steady-state tape tension (reel-to-reel equipment only)
17 - 11.3 Maximum start and stop times
17 - 11.3.1 Maximum start time to record/reproduce speed
18 - 11.3.2 Maximum stop time from record/reproduce speed
18 - 11.3.3 Maximum stop time for maximum spooling speed
18 - 11.3.4 Maximum fast spooling time
19 - 11.4 Track configuration for multi-track heads
19 - 12. Measurement of electrical parameters
19 - 12.1 Maximum power consumption
19 - 12.2 Reproducing performance
19 - 12.2.1 Maximum deviation from flat reproducing response within the specified frequency range using the specified calibration tap
20 - 12.2.2 Signal/noise ratio of reproducing chain (electronic noise)
21 - 12.2.3 Voltage output level at specified total harmonic distortion
21 - 12.2.4 Unbalance of output (for balanced outputs only)
21 - 12.2.5 Output impedance
21 - 12.2.6 Power output level of equipment with built-in loudspeaker amplifier at specified total harmonic distortion
22 - 12.2.7 Reproduce channel unbalance
22 - 12.3 Overall performance
22 - 12.3.1 Maximum deviation of overall characteristic from flat response within the specified frequencies range using the specified
23 - 12.3.2 Signal/noise ratio
24 - 12.3.3 Separation between neighbouring tracks
25 - 12.3.4 Erasing attenuation
25 - 12.3.5 Overall channel unbalance
25 - 12.3.6 Third harmonic distortion
26 - 12.4 Recording performance
26 - 12.4.1 Maximum deviation from the specified recording characteristic within the specified frequency range using the specified re
26 - 12.4.2 Minimum source e.m.f (equipment with adjustable record gain only)
27 - 12.4.3 Maximum source e.m.f. (equipment with adjustable record gain only)
27 - 12.4.4 Unbalance of input (for balanced inputs only)
27 - 12.4.5 Input impedance
28 - Amendment No.2 to Publication 94-3 (1979)

Applies to recording and reproducing equipment for sound on magnetic tape (reel-to-reel, cassette and cartridge) for both professional and domestic applications. It does not apply to special purpose equipment such as high speed duplicators, artificial reverberation recorders or dictation machines. This Standard is identical with and has been reproduced from IEC 94-3:1979, including Amendment 1:1980 and Amendment 2:1988.

This standard applies to recording and reproducing equipment for sound on magnetic tape (reel-to-reel, cassette and cartridge) for both professional and domestic applications, and will be referred to as "equipment" throughout this standard.This standard does not apply to special purpose equipment such as high speed duplicators, artificial reverberation recorders or dictation machines not employing the reel-to-reel, cassette or cartridge principle. This standard excludes all aspects of safety, which are to be found in IEC Publication 65, Safety Requirements for Mains Operated Electronic and Related Apparatus for Household and Similar General Use. It also excludes magnetic tape properties, which are to be found in IEC Publications 94-4 and 94-5 (in preparation).

First published as AS 3871.3-1994.