17.140.50 电声学 标准查询与下载
共找到 949 条与 电声学 相关的标准，共 64 页
Medical electrical equipment - Part 2-37: Particular requirements for the basic safety and essential performance of ultrasonic medical diagnostic and monitoring equipment
- ICS
- 17.140.50
- CCS
- 发布
- 2015-06-08
- 实施
This International Standard applies to the BASIC SAFETY and ESSENTIAL PERFORMANCE of ULTRASONIC DIAGNOSTIC EQUIPMENT as defined in 201.3.217@ hereinafter referred to as ME EQUIPMENT. If a clause or subclause is specifically intended to be applicable to ME EQUIPMENT only@ or to ME SYSTEMS only@ the title and content of that clause or subclause will say so. If that is not the case@ the clause or subclause applies both to ME EQUIPMENT and to ME SYSTEMS@ as relevant. HAZARDS inherent in the intended physiological function of ME EQUIPMENT or ME SYSTEMS within the scope of this standard are not covered by specific requirements in this standard except in 7.2.13 and 8.4.1 of this standard. NOTE See also subclause 4.2 of this standard. This particular standard does not cover ultrasonic therapeutic equipment. Equipment used for the imaging or diagnosis of body structures by ultrasound in conjunction with other medical procedures is covered.
Medical electrical equipment - Part 2-37: Particular requirements for the basic safety and essential performance of ultrasonic medical diagnostic and monitoring equipment
- ICS
- 17.140.50
- CCS
- 发布
- 2015-06-01
- 实施
- 2015-06-10
Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone audiometry (IEC 60645-1:2012)
- ICS
- 17.140.50
- CCS
- 发布
- 2015-05-15
- 实施
- 2015-05-15
Electroacoustics - Simulators of human head and ear - Part 3 : acoustic coupler for the calibration of supra-aural earphones used in audiometry
- ICS
- 17.140.50
- CCS
- A42
- 发布
- 2015-04-18
- 实施
- 2015-04-18
Methods for characterising signal processing in hearing aids with a speech-like signal
- ICS
- 17.140.50
- CCS
- L31
- 发布
- 2015-04-01
- 实施
Electroacoustics - Audio-frequency induction loop systems for assisted hearing - Part 2: Methods of calculating and measuring the low-frequency magnetic field emissions from the loop for assessing conformity with guidelines on limits for human exposure (I
- ICS
- 17.140.50
- CCS
- 发布
- 2015-03-31
- 实施
Electroacoustics. Hearing aids. Induction-loop systems for hearing aid purposes. System performance requirements
- ICS
- 17.140.50
- CCS
- L31
- 发布
- 2015-02-28
- 实施
- 2015-02-28
IEC 60318-3:2014 specifies an acoustic coupler for the measurement of supra-aural audiometric earphones in the frequency range from 125 Hz to 8 000 Hz. The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person's ear. However, the acoustic coupler can be used as an objective and reproducible means of measuring the output of supra-aural earphones. It can be used for specifying reference equivalent threshold sound pressure levels for the calibration of audiometers. This second edition cancels and replaces the first edition published in 1998 and constitutes a technical revision which includes the following significant technical changes with respect to the previous edition: - adjustment of terms and wording to the other parts of IEC 60318; - introduction of maximum permitted uncertainties; - and revised requirements for static pressure equalization. Keywords: electroacoustics, deafness, hearing aids
Electroacoustics - Simulators of human head and ear - Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
- ICS
- 17.140.50
- CCS
- 发布
- 2015-02-13
- 实施
- 2015-04-15 (7)
Electroacoustics �C Hearing aids �C Part 4: Induction-loop systems for hearing aid purposes �C System performance requirements (Incorporates Amendment A1: 2018)
- ICS
- 17.140.50
- CCS
- 发布
- 2015-02-01
- 实施
State system for ensuring the uniformity of measurements. Ultrasonics. Methods of conditioning of water for ultrasonic measurements
- ICS
- 17.140.50
- CCS
- C41
- 发布
- 2015
- 实施
- 2016-07-01
Determination and application of precision methods for testing of petroleum products
- ICS
- 17.140.50
- CCS
- 发布
- 2015
- 实施
- 2017-07-01
Measurement and characterization of ultrasonic fields using hydrophones in the frequency range 0.5 MHz to 15 MHz
- ICS
- 17.140.50
- CCS
- 发布
- 2014-12-31
- 实施
- 2014/12/31
Electroacoustics — Sound calibrators
- ICS
- 17.140.50
- CCS
- 发布
- 2014-12-31
- 实施
- 2014/12/31
Acoustics — Procedures for the measurement of real-ear acoustical characteristics of hearing aids
- ICS
- 17.140.50
- CCS
- 发布
- 2014-12-31
- 实施
- 2014/12/31
Measurement and characterization of ultrasonic fields using hydrophones in the frequency range 0.5 MHz to 15 MHz
- ICS
- 17.140.50
- CCS
- 发布
- 2014-12-31
- 实施
This part of IEC 645 specifies requirements for audiometers or parts thereof designed to provide a means of presenting speech sounds to a subject in a standardized manner, for example for the measurement of speech recognition. Audiometers are classified into four types: type A instruments provide a wide range of facilities, while type B provides only basic facilities. For both types, the audiometer may be calibrated in terms of a free-field equivalent output level of the earphones and then be des ignated as type A-E or B-E. This standard excludes the requirements for speech audiometers provided with frequency response adjustments intended to determine an optimal intelligibility frequency response curve for each subject. The purpose of this standard is to ensure that tests of hearing using speech as the test stimulus, on a given human ear performed with different audiometers which comply with this standard, shall give substantially the same results for a given calibration method. Two methods of specification, calibration and testing are given for the output levels generated by the earphones and the bone vibrator: a) a free-field equivalent output level method with audiometers of types A-E and B-E; b) an uncorrected coupler output level method with audiometers of types A and B. NOTE - The results will also depend on factors other than the audiometer for example test material, test room, speakers, etc.
Audiometers - Part 2: Equipment for speech audiometry
- ICS
- 17.140.50
- CCS
- 发布
- 2014-12-25
- 实施
This part of IEC 60645 specifies a means of describing the physical characteristics of audiometric reference and test signals of short duration and methods for their measurement. The object of this standard is to ensure that audiometric stimuli of short duration are specified and measured in the same way and that the calibration of equipment using such signals is carried out using defined methods. This standard does not describe the method of use of short duration test signals.
Electroacoustics - Audiometric equipment - Part 3: Test signals of short duration
- ICS
- 17.140.50
- CCS
- 发布
- 2014-12-25
- 实施
