251. Specification for general requirements for equipment for use in aircraft. All equipment. Environmental conditions. Acoustic vibration Part 2.3.14, (31st December 1973) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (14 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
252. Specification for measurement and characterisation of ultrasonic fields using hydrophones in the frequency range 0.5 MHz to 15 MHz. (15th April 1994) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (52 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
253. Specification for measurement microphones. Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique Part 3, (15th July 1996) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (24 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
254. Specification for measurement microphones. Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique Part 2, (15th April 1994) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (34 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
255. Specification for normal equal-loudness level contours for pure tones under free-field listening conditions. (29th February 1988) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (16 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
256. Specification for occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts. (31st December 1982) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (14 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
257. Specification for personal sound exposure meters. (31st August 1983) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (28 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
258. Specification for processed disk records and reproducing equipment. (26th January 1972) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (22 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
259. Specification for pure tone air conduction threshold audiometry for hearing conservation purposes. (31st January 1986) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (18 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
260. Specification for reference levels for narrow-band masking noise. (29th September 1989) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (12 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗