{"id":231253,"date":"2024-10-19T15:03:32","date_gmt":"2024-10-19T15:03:32","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-60645-12015\/"},"modified":"2024-10-25T09:22:05","modified_gmt":"2024-10-25T09:22:05","slug":"bs-en-60645-12015","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-60645-12015\/","title":{"rendered":"BS EN 60645-1:2015"},"content":{"rendered":"

This part of IEC 60645 specifies general requirements for audiometers and particular requirements for pure -tone audiometers designed for use in determining hearing threshold levels, relative to standard reference threshold levels established by means of psychoacoustic test methods.<\/p>\n

The object of this sta ndard is to ensure:<\/p>\n

    \n
  1. \n

    that tests of hearing in the frequency range 125 Hz to 16 000 Hz on a given human ear, performed with different audiometers which comply with this standard shall give substantially the same results;<\/p>\n<\/li>\n

  2. \n

    that the results obtained represent a valid comparison between the hearing of the ear tested and the reference threshold of hearing;<\/p>\n<\/li>\n

  3. \n

    that audiometers are classified according to the range of test signals they generate, according to the mode of operation or according to the complexity of the range of auditory functions they test.<\/p>\n<\/li>\n<\/ol>\n

    PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
    7<\/td>\nEnglish
    CONTENTS <\/td>\n<\/tr>\n
    10<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
    11<\/td>\n1 Scope
    2 Normative references <\/td>\n<\/tr>\n
    12<\/td>\n3 Terms and definitions <\/td>\n<\/tr>\n
    15<\/td>\n4 Requirements for specific types of fixed frequency audiometer
    Tables
    Table 1 \u2013 Minimum facilities for fixed-frequency audiometers <\/td>\n<\/tr>\n
    16<\/td>\n5 General requirements
    5.1 General safety requirements
    5.2 Acoustic safety requirements
    5.3 Environmental conditions
    5.4 Warm-up time
    5.5 Power supply variation
    5.5.1 Interruption of power supply <\/td>\n<\/tr>\n
    17<\/td>\n5.5.2 Mains operation
    5.5.3 Battery operation
    5.5.4 Other power supplies
    5.6 Electromagnetic compatibility
    5.7 Unwanted sound
    5.7.1 General
    5.7.2 Unwanted sound from an earphone
    5.7.3 Unwanted sound from a bone vibrator <\/td>\n<\/tr>\n
    18<\/td>\n5.7.4 Unwanted sound radiated by an audiometer
    5.8 Testing of automatic-recording audiometers
    5.9 Interface connections
    6 Test signals
    6.1 Pure tones
    6.1.1 Frequency range and hearing level range
    Table 2 \u2013 Minimum number of frequencies to be provided and the minimum rangeof values of hearing level for fixed frequency audiometers <\/td>\n<\/tr>\n
    19<\/td>\n6.1.2 Frequency accuracy
    6.1.3 Total harmonic distortion
    Table 3 \u2013 Minimum range of values of hearing level for EHF audiometers <\/td>\n<\/tr>\n
    20<\/td>\n6.1.4 Rate of frequency change
    6.2 Frequency modulation
    6.3 External signal source
    6.3.1 Signals
    6.3.2 Frequency response
    Table 4 \u2013 Maximum permissible acoustic total harmonic distortion, for supra-aural, circumaural, insert earphones and bone vibrators <\/td>\n<\/tr>\n
    21<\/td>\n6.3.3 Electrical sensitivity
    6.3.4 Reference level for external signal source
    6.3.5 Operator to subject speech communication
    6.3.6 Subject to operator speech communication
    6.4 Masking sound
    6.4.1 General
    6.4.2 Narrow-band noise <\/td>\n<\/tr>\n
    22<\/td>\nTable 5 \u2013 Narrow-band masking noise: upper and lower cut-off frequencies for a sound pressure spectrum density level of \u20133\u00a0dB referred to the level at the centre frequency of the band <\/td>\n<\/tr>\n
    23<\/td>\n6.4.3 Other masking sound
    7 Transducers
    7.1 Type of transducers
    7.2 Headband
    7.3 Loudspeaker
    8 Signal level control
    8.1 Marking
    8.2 Signal indicator <\/td>\n<\/tr>\n
    24<\/td>\n8.3 Accuracy of sound pressure level and vibratory force level
    8.4 Hearing level control
    8.4.1 Manual audiometers
    8.4.2 Automatic-recording audiometers
    8.4.3 Accuracy of control <\/td>\n<\/tr>\n
    25<\/td>\n8.5 Masking level control
    8.5.1 General
    8.5.2 Masking level
    8.5.3 Accuracy of masking levels
    8.5.4 Masking level range
    8.6 Tone switching
    8.6.1 Tone switch for manual audiometers
    8.6.2 On\/off ratio for manual audiometers <\/td>\n<\/tr>\n
    26<\/td>\n8.6.3 Rise\/fall times for manual audiometers
    8.6.4 Automatic pulsed presentation <\/td>\n<\/tr>\n
    27<\/td>\n8.6.5 Subject\u2019s response time for automated test procedures
    8.6.6 Subject\u2019s response system
    9 Reference tone
    9.1 General
    9.2 Frequencies
    Figure 1 \u2013 Rise\/fall envelope of test tones <\/td>\n<\/tr>\n
    28<\/td>\n9.3 Reference tone level control
    9.3.1 Range
    9.3.2 Intervals
    9.3.3 Marking
    9.3.4 Accuracy
    9.3.5 Operation
    10 Calibration <\/td>\n<\/tr>\n
    29<\/td>\n11 Electrical output of test signals
    12 Audiogram format
    Table 6 \u2013 Reference standards for obtaining audiometric zero
    Table 7 \u2013 Symbols for the graphical presentation of hearing threshold levels <\/td>\n<\/tr>\n
    30<\/td>\n13 Test requirements to demonstrate conformity
    13.1 General
    13.2 Environmental conditions and power supply variation
    13.3 Electromagnetic compatibility <\/td>\n<\/tr>\n
    31<\/td>\n13.4 Unwanted sound
    13.4.1 Unwanted sound from an earphone
    13.4.2 Unwanted sound from a bone vibrator <\/td>\n<\/tr>\n
    32<\/td>\n13.4.3 Unwanted sound radiated by an audiometer
    13.5 Total harmonic distortion of test signals
    13.6 Signal accuracy
    13.6.1 Accuracy of sound pressure level and vibratory force level
    13.6.2 Accuracy of hearing level control
    13.7 Masking sound
    13.7.1 Narrow-band noise <\/td>\n<\/tr>\n
    33<\/td>\n13.7.2 Masking level
    13.8 Headbands
    13.8.1 General
    13.8.2 Supra-aural and circumaural earphone headband
    13.8.3 Bone vibrator headband
    14 Maximum permitted expanded uncertainty of measurements Umax <\/td>\n<\/tr>\n
    34<\/td>\n15 Marking and instruction manual
    15.1 Marking
    15.2 Instruction manual
    Table 8 \u2013 Values of Umax for basic measurements <\/td>\n<\/tr>\n
    36<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

    Electroacoustics. Audiometric equipment – Equipment for pure-tone audiometry<\/b><\/p>\n\n\n\n\n
    Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
    BSI<\/b><\/a><\/td>\n2015<\/td>\n38<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":231254,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[270,2641],"product_tag":[],"class_list":{"0":"post-231253","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-140-50","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/231253","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/231254"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=231253"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=231253"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=231253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}