ISO 11904-1-2002 pdf download.Acoustics – Determination of sound immission from sound sources placed close to the ear- Part 1: Technique using a microphone in a real ear (MIRE technique).
This part of ISO 11904 specifies basic framework measurement methods for sound immission from sound sources placed close to the ear. These measurements are carried out with miniature or probe microphones inserted in the ear canals of human subjects. The measured values are subsequently converted into corresponding free-field or diffuse-field levels. The results are given as free-field related or diffuse-field related equivalent continuous A-weighted sound pressure levels. The technique is denoted the microphone-in-real-ear technique (MIRE technique).
This part of ISO 11904 is applicable to exposure from sources close to the ear, for example during equipment tests or at the workplace by earphones or hearing protectors with audio communication facilities.
This part of ISO 11904 is applicable in the frequency range from 20 Hz to 16 000 Hz.
2 Normative references
The following normative documents contain provisions wt,ich, through reference in this text, constitute provisions of this part of ISO 11904. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 11904 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards,
ISO 8253-2:1992, Acoustics — Audiometnc test methods — Part 2: Sound field audiometry with pure tone and narrow-band test signals
I EC 60065. Audio, video and similar electronic apparatus — Safety requirements
IEC 60268-7:1996, Sound system equipment — Par? 7: Headphones and earphones
I EC 60601-1, Medical eleckical equipment — Pail 1: General requirements for safety
IEC 60942, Eiectroacoustics — Sound calibrators
IEC 61094-1, Measurement microphones — Part 1: Specifications for laboratory standard microphones
I EC 61260. Electroacoustics — Octave-band and fractional-octave-band filters
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
GUM:19931), Guide to the expression of uncertainty in measurement. BIPM. IEC, IFCC, ISO, IUPAC, IUPAP. OILM
3 Terms and definitions
For the purposes of this part of ISO 11904. the following terms and definitions apply.
ear canal measurement position
position in the ear canal where the sound pressure is measured
3.2 ear canal sound pressure level Lear equivalent continuous sound pressure level measured at the ear canal measurement position
NOTE When measured during exposure to sound under test, it is denoted Leare. When ophonaly measured during exposure to a reference sound field in the determination of the free-field or diffuse-field frequency response according to clause 10, it is denoted L(,pF or Lep, respectively. When measured in one-third-octave frequency bands wdh nominal midband frequency! these are denoted Lrexpi, Lear FFj and L,DFJ.
3.3 human free-field frequency response LFFHJ difference, as a function of one-third-octave frequency bandsf, between
the sound pressure level at the ear canal measurement position with the subject exposed to a frontally incident plane sound wave, and
the sound pressure level of the same sound field with the subject absent
NOTE 1 The free-field frequency response is identical to the amplitude of the head-related transfer function (HRTF) for frontal sound incidence.
NOTE 2 This definition is applicable to individual subjects and groups of subjects.
3.4 human diffuse-field frequency response DF.HJ
difference, as a function of one-third-octave-frequency bandsj between
the sound pressure level at the ear canal measurement position with the subject exposed to a diffuse sound field, and
the sound pressure level of the same sound field with the subject absent.ISO 11904-1 pdf download.
Tags: Acoustics
-
ISO 8600-1-2013 pdf free download.Endoscopes – Medical endoscopes and endotherapy devices – Part 1: General requirements. 6 Marking 6.1 Minimum marking Iach individual endoscope or endotherapy device shall have the lollowing minimum marking: a) model number and/or other mark sufficient to identify the endoscope or endotherapy device and its manufacturer; b) maximum insertion portion width, minimum instrument channel width, working length, field of view and/or direction of view where such identification is necessary for the intended use of the endoscope or endotherapy device. The Insertion portion width and instrument channel width units shall be in millimetres. The insertion portion width and instrument channel width can also be marked in French size as defined in 3.5, shown by either ‘Fr or an encircled number; c) wherever reasonable and practicable. the endoscope or endotherapy device and detachable component(s) shall be identified in terms of lot numbers or serial numbers, etc. 6.2 Marking legibility The marking shall remain legible over the lifetime of the device when the endoscope or endotherapy device is used, cleaned, disinlected, sterilized and stored in accordance with the instruction manual. 6.3 Marking exceptions When marking on the endoscope or endotherapy device or detachable component(s) is impossible to achieve due…
-
ISO 15688-2012 pdf free download.Road construction and maintenance equipment – Soil stabilizers 一 Terminology and commercial specifications. This International Standard establishes the terminology, definitions of operation and commercial specifications for soil stabilizers and their components intended for use in road construction and pavement works. It does not apply to soil stabilizers used in agricultural applications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.. ISO 3911, Wheels and rims for pneumatic tyres — Vocabulary, designation and marking ISO 6746-1, Earth-moving machinery — Definitions of dimensions and codes — Part 1: Base machine ISO 6746-2, Earth-moving machinery — Definitions of dimensions and codes — Part 2: Equipment and attachments ISO 7134. Earth-moving machinery — Graders — Terminology and commercial specifications 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 soil stabilizer self-propelled machine, either towed or transported, with the function of pulverizing, breaking-up, aerating, homogenizing, and loosening existing and imported soil or paving materials and mixing them…
-
ISO 18436-1-2012 pdf free.Condition monitoring and diagnostics of machines – Requirements for qualification and assessment of personnel一 Part 1: Requirements for assessment bodies and the assessment process. 5 Requirements for assessment body personnel 5.1 General provisions In order to ensure that the assessment process is carried out effectively and uniformly, the competence requirements for personnel involved in the entire process shall be defined by the assessment body and, in the case of a third party, be approved by the responsible TCC (in accordance with ISO/IEC 17024). The assessment body shall require its personnel (internal or external) to sign a contract, or other document, by which they commit themselves to comply with the rules defined by the assessment body, including those relating to confidentiality and those relating to independence from commercial and other interests, and from any prior or present link with the persons to be examined that would, in the opinion of the interested parties, compromise impartiality. Clearly documented instructions shall be available to the personnel, describing their duties and responsibilities. These instructions shall be maintained up to date. All personnel involved in any aspect of assessment activities shall possess appropriate educational qualifications, experience and technical expertise, which satisfy defined…