Metrologi och mätning. Fysikaliska fenomen

Kommittébeteckning: SIS/TK 110 (Akustik och buller)
Källa: ISO
Svarsdatum: den 18 jan 2019
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The proposed standard deals with cases where a vibrating component (a source of structure-borne sound

or vibration) is attached to a passive structure (or receiver) and is the cause of vibration in, or structureborne

sound radiation from, the assembly. Examples are pumps installed in ships, servo motors in

vehicles or machines and plant in buildings. Almost any vibrating component can be considered as a

source in this context.

It is necessary to measure vibration at all contact degrees of freedom (connections between the source

and receiver). Therefore, the standard can only be applied to assemblies for which such measurement is

possible.

The standard is restricted to assemblies whose frequency response functions (FRFs) are linear and time

invariant.

The source may be installed into a real assembly or attached to a specially designed test stand (as

described in 4.2).

The standard method has been validated for stationary signals such that the results can be presented in

the frequency domain. However, the method is not restricted to stationary signals and with appropriate

data processing it is also applicable to time-varying signals such as transients and shocks (provided

linearity and time invariance of the FRFs is preserved).

Kommittébeteckning: SIS/TK 110 (Akustik och buller)
Källa: ISO
Svarsdatum: den 19 jan 2019
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This standard applies to Hearing Aid Fitting Management (HAFM) services offered by hearing aid professionals (HAP) when providing benefit for their clients. The provision of hearing aids relies on the practices of a hearing aid professional, to ensure the proper fitting and adequate service in the interest of the client with hearing loss.

This standard specifies general processes of HAFM from the client profile to the follow-up through administering, organising and controlling hearing aid fitting through all stages. It also specifies important preconditions such as education, facilities, and systems that are required to ensure proper services.

The focus of this standard is the services offered to the majority of adult clients with hearing impairment. It is recognized that certain groups of hearing loss such as children, persons with other disabilities or persons with implantable devices may require services outside the scope of this standard.

Hearing loss can be a consequence of serious medical conditions. Hearing aid professionals are not in a position to diagnose or treat such conditions. When assisting clients seeking hearing rehabilitation without prior medical examination hearing aid professionals must be observant of symptoms of such conditions and refer to proper medical care.

Further to the main body of the standard, that specifies the HAFM requirements and processes, several informative annexes are provided. Proper education of hearing aid professionals is vital for exercising HAFM. Annex A defines the competencies required for the HAFM processes; Annex B offers a recommended curriculum for education of hearing aid professionals. Annex C is an example of an appropriate fitting room. Annex D is a guidance on referral of clients for medical or other specialist examination and treatment. Annex E is a recommendation for important information to be exchanged with the client during the course of HAFM. Annex F is a comprehensive terminology list offering definitions of most current terms related to HAFM.

It is the intention that these annexes will be helpful to those who wish to deliver HAFM of the highest quality.

Kommittébeteckning: SIS/TK 254 (Järnvägar)
Källa: CEN
Svarsdatum: den 14 feb 2019
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This document establishes definitions and evaluation methods for wheel-rail contact geometry parameters influencing the vehicle running dynamic behaviour:

— the rolling radius difference between the two wheels of a wheelset (Δr-function) which serves as a basis for all further calculations;

— the equivalent conicity function from which are derived:

— a single equivalent conicity value for a specified amplitude which is relevant for the assessment of vehicle running stability on straight track and in very large radius curves according to EN 14363;

— the nonlinearity parameter which characterizes the shape of this function and is related to the vehicle behaviour particularly in the speed range close to the running stability limit;

— the rolling radii coefficient which is used to describe the theoretical radial steering capability of a wheelset in a curved track.

Additional information is given about the relationship between the contact angles of the two wheels of a wheelset (Δtanγ-function) and about the roll angle parameter.

NOTE Out of the presented parameters only those related to the contact angle are relevant for independently rotating wheels of wheel pairs.

Descriptions of possible calculation methods are included in this document. Test case calculations are provided to achieve comparable results and to check the proper implementation of the described algorithms.

To validate alternative methods not described in this document acceptance criteria are given for the equivalent conicity function. This includes reference profiles, profile combinations, tolerances and reference results with tolerance limits.

This document also includes minimum requirements for the measurement of wheel and rail profiles as well as of the parameters needed for the transformation into a common coordinate system of right- and left-hand profiles.

This document does not define limits for the wheel-rail contact geometry parameters and gives no tolerances for the rail profile and the wheel profile to achieve acceptable results.

For the application of this document some general recommendations are given.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 18 feb 2019
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ISO 13163 specifies the determination of lead-210 (210Pb) activity concentration in samples of all types of water using liquid scintillation counting (LSC). For raw and drinking water, the sample should be degassed in order to minimize the ingrowth of 210Pb from radon-222 (222Rn).

Using currently available liquid scintillation counters, this test method can measure the 210Pb activity concentrations in the range of less than 20 mBq⋅l-1 to 50 mBq⋅l-1. These values can be achieved with a counting time between 180 min and 720 min for a sample volume from 0,5 l to 1,5 l.

Higher 210Pb activity concentrations can be measured by either diluting the sample or using smaller sample aliquots or both.

It is the laboratory’s responsibility to ensure the suitability of this test method for the water samples tested.

Kommittébeteckning: SIS/TK 111 (Vibration och stöt)
Källa: ISO
Svarsdatum: den 20 feb 2019
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This document sets out guidelines for the specific procedures to be considered when carrying out vibration diagnostics of various types of fans and blowers.

This document is intended to be used by condition monitoring practitioners, engineers and technicians and provides a practical step-by-step vibration-based approach to fault diagnosis. In addition it gives a number of examples for a range of machine and component types and their associated fault symptoms.

Ämnesområden: Strålningsmätning
Kommittébeteckning: SIS/TK 405 (Kärnenergi)
Källa: ISO
Svarsdatum: den 8 mar 2019
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The purpose of this document is to provide minimum criteria required for quality assurance and quality control, evaluation of the performance and to facilitate the comparison of measurements related to absorbed dose estimation obtained in different laboratories applying ex vivo X-band EPR spectroscopy with human tooth enamel.

This document covers the determination of absorbed dose in tooth enamel (hydroxyapatite). It does not cover the calculation of dose to organs or to the body.

This document addresses:

1) Responsibilities of the customer and laboratory;

2) Confidentiality and ethical considerations;

3) Laboratory safety requirements;

4) The measurement apparatus;

5) Preparation of samples;

6) Measurement of samples and EPR signal evaluation;

7) Calibration of EPR dose response;

8) Dose uncertainty and performance test;

9) Quality assurance and control.