PRICES include / exclude VAT
Homepage>BS Standards>11 HEALTH CARE TECHNOLOGY>11.040 Medical equipment>11.040.01 Medical equipment in general>BS EN ISO 389-4:1999 Acoustics. Reference zero for the calibration of audiometric equipment Reference levels for narrow-band masking noise
Sponsored link
immediate downloadReleased: 1999-07-15
BS EN ISO 389-4:1999 Acoustics. Reference zero for the calibration of audiometric equipment Reference levels for narrow-band masking noise

BS EN ISO 389-4:1999

Acoustics. Reference zero for the calibration of audiometric equipment Reference levels for narrow-band masking noise

Format
Availability
Price and currency
English Secure PDF
Immediate download
195.00 USD
English Hardcopy
In stock
195.00 USD
Standard number:BS EN ISO 389-4:1999
Pages:16
Released:1999-07-15
ISBN:0 580 23599 8
Status:Standard
DESCRIPTION

BS EN ISO 389-4:1999


This standard BS EN ISO 389-4:1999 Acoustics. Reference zero for the calibration of audiometric equipment is classified in these ICS categories:
  • 11.040.01 Medical equipment in general
  • 13.140 Noise with respect to human beings

This part of ISO 389 specifies reference levels for narrow-band masking noise presented by air conduction from an earphone in pure-tone audiometry. The data are given in terms of levels to be added to the reference equivalent threshold sound pressure levels for the corresponding pure-tone frequencies as specified in ISO 389:1991 or ISO 389-2, respectively, when the masking earphone is placed on the appropriate acoustic coupler, ear simulator or artificial ear.

Data are given for noise bandwidths of one-third and one-half octaves.

NOTE 1 Some notes on the derivation of the reference levels are given in annex A.