Specification for preferred sizes of casting pit refractories.

NEPLATNÁ vydána dne 18.10.1968

Specification for a reference zero for the calibration of pure-tone audiometers. Data for earphone coupler combinations maintained at certain standardizing laboratories.

NEPLATNÁ vydána dne 20.9.1968

Specification for a reference zero for the calibration of pure-tone audiometers. Data for certain earphones used in commercial practice.

NEPLATNÁ vydána dne 10.3.1971

Specification for a reference zero for the calibration of pure-tone audiometers. Data for a wide-band artificial ear complying with BS 4669.

NEPLATNÁ vydána dne 28.6.1972

Specification for a reference zero for the calibration of pure-tone audiometers. Normal threshold of hearing for pure tones by bone conduction.

NEPLATNÁ vydána dne 25.7.1972

Standard reference zero for the calibration of pure tone air conduction audiometers. Specification for a standard reference zero using an acoustic coupler complying with BS 4668.

NEPLATNÁ vydána dne 29.2.1988

Acoustics. Reference zero for the calibration of audiometric equipment. Specification for a standard reference zero using an artificial ear complying with BS 4669.

NEPLATNÁ vydána dne 29.2.1988

Standard reference zero for the calibration of pure tone air conduction audiometers. Specification for a standard reference zero at frequencies intermediate between those given in Parts 5 and 6 of BS 2497.

NEPLATNÁ vydána dne 29.2.1988

The normal threshold of hearing for pure tones by earphone listening.

NEPLATNÁ vydána dne 30.7.1954

Recommendations for ascertaining and expressing the performance of loudspeakers by objective measurements.

NEPLATNÁ vydána dne 1.1.1954