A device for measuring the detonation coefficient of equipment for recording and reproducing sound. Technical requirements
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Instruments for measurement of wow rate, speed oscillation and extraneous amplitude modulation factors, and speed drift for sound recording and reproduction equipment
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Tonal audiometers. Equivalent threshold sound pressure levels
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Tonal audiometers. Equivalent threshold levels for air and bone conduction of sound
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Measuring condenser microphones. Technical requirements
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Measuring condenser microphones. General technical requirements
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Filters electric octave and one-third octave. General technical requirements
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Octave and one-third-of-octave electronic filters
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Noise meters. General technical requirements
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Cinema projectors for 35-mm motion pictures. Types. Technical characteristics
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Cinema projectors for 35-mm motion pictures. Types, basic parameters
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