Normy

Obsah

ČSN EN IEC 63296-2 This document is applicable to active acoustic noise-cancelling headphones and earphones that have the function of reducing the ambient noise heard by the user by the level of the output sound from the transducer, which is generated by the ambient noise detection microphone and the noise reduction signal processing circuit. This document covers headphones and earphones to be worn over-the-ear or in-ear, all of which are referred to as "headphones" in this document. This document specifies the terms and definitions relating to battery duration of this type of headphones and the measurement and evaluation methods. The noise detection microphones are mounted in the body, on the surface, or on an accessory of the headphones. Signal-processing circuits are analogue and digital electronic circuits. This document does not deal with equipment intended for hearing protection. It is also not applicable to music players, recorders, etc. that have a noise-cancelling function. The battery duration measurement methods can be applied to headphones having no active noise-cancelling function.

Obsah

ČSN EN ISO 2613-2 This document describes a gas chromatography - ion mobility spectroscopy (GC-IMS) method for the determination of the concentration of siloxanes in biomethane. The method is applicable to the following siloxanes: - hexamethyldisiloxane (L2); - octamethyltrisiloxane (L3); - decamethyltetrasiloxane (L4); - dodecamethylpentasiloxane (L5); - hexamethylcyclotrisiloxane (D3); - octamethylcyclotetrasiloxane (D4); - decamethylcyclopentasiloxane (D5); - dodecamethylcyclohexasiloxane (D6). This document describes suitable calibration and measurement strategies to quantify siloxanes in (bio)methane around and above the 0,3 mg m-3 (14 µmol mol-1) level and applies to analyses within absolute pressure ranges of 1 bar - 2 bar, temperatures of 0 °C - 40 °C and relative humidity < 90 %.

Obsah

ČSN EN ISO 2612 This document describes several test methods for measuring the ammonia amount fraction in natural gas and biomethane at the trace level (µmol mol-1). The suitable handling and sampling of pressurised mixtures of ammonia in methane that are applied to several different ammonia measurement systems are described. The measurement systems are comprised of readily available commercial spectroscopic analysers that are specific to ammonia. These NH3 analysers are considered as a black box in terms of their operation, which is dependent on the instructions of the manufacturer. The document describes suitable calibration and measurement strategies to quantify ammonia in (bio)methane around and above the 10 mg m-3 (14 µmol mol-1) level and applies to analysis within absolute pressure ranges of 1 bar - 2 bar, temperatures of 0 °C - 40 °C and relative humidity

Obsah

ČSN EN 370 This document specifies a method for the determination of the curative action of a wood preservative against infestation by Anobium punctatum (De Geer) when the product is applied as a surface treatment to wood. This method is applicable to any surface-applied treatment that is intended to prevent emergence of adult beetles but not intended to kill larvae in infested timber. NOTE 1 - This method can be used in conjunction with an ageing procedure, for example EN 73. NOTE 2 - Products intended to kill larvae can be tested by the method described in EN 48.

Obsah

ČSN EN 20-2 This part of the EN 20 series specifies a method for the determination of the protective effectiveness or the toxic values of a wood preservative against infection by Lyctus brunneus (Stephens) in wood which has been treated previously by full impregantion. This method is applicable to: - water-insoluble chemicals which are being studied as active insecticides; or - organic formulsation, as supplied or as prepared in the laboratory by dilution of concentrates. This method is applicable to water-based preservatives. NOTE - This method can be used in conjuction with ageing procedures, which do not remove the added nutrient.

Obsah

ČSN EN 20-1 This part of the EN 20 series specifies a method for the determination of the protective effectiveness or the toxic values of a wood preservative against infection by Lyctus brunneus (Stephens) when the product is applied as a surface treatment to wood. This method is applicable to: - water-insoluble chemicals which are being studied as active insecticides; or - organic formulsation, as supplied or as prepared in the laboratory by dilution of concentrates; or - organic water-dispersible formulations as supplied or as prepared in the laboratory by dilution of concentrates; or - water-based preservatives, for example salts. NOTE - This method can be used in conjuction with ageing procedures, which do not remove the added nutrient.

Obsah

ČSN EN 117 This document specifies a method for the determination of the toxic values of a wood preservative against the Reticulitermes species of European termites. NOTE 1 - The method can be applied not only to different species of Reticulitermes, but also to other species of the family of the Rhinotermitidae, adapting the conditions of temperature and humidity where necessary to the specific requirements of the species concerned. This method is applicable to: - water-insoluble chemicals which are being studied as active insecticides; - organic water-dispersible formulations as supplied or as prepared in the laboratory by dilution of concentrates; - water-soluble materials, for example salts. NOTE 2 - This method can be used in conjunction with an ageing procedure, for example EN 73 or EN 84.

Obsah

ČSN EN ISO 20753 This document specifies dimensional requirements relating to test specimens prepared from plastics materials intended for processing by moulding, as well as to test specimens prepared by machining from sheets or shaped articles. It compiles the designations and dimensions of test specimens used for the acquisition of comparable data and of other frequently used specimens. The following types of test specimen are specified: A Tensile specimen, multipurpose or reduced-scale B Bar specimen C Small tensile specimen D Square plate specimen F Rectangular plate specimen NOTE - If a particular type of test specimen is not mentioned in this document, this does not mean that there is any intention to exclude the use of the specimen. Additional specimen types can be added in future if they are commonly used.

Obsah

ČSN EN 17908 This document specifies a laboratory method for the determination of the total lipid content in micro- and macroalgae by the Ryckebosch-Foubert method.

Obsah

ČSN EN 16272-2 This document specifies the laboratory method for measuring the airborne sound insulation performance of railway noise barriers in reverberant conditions. It covers the assessment of the intrinsic performance of noise barriers and related devices acting on airborne sound propagation that can reasonably be assembled inside the testing facility described in EN ISO 10140-2 and EN ISO 10140-4. This method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise barriers to be installed on railway in non-reverberant conditions. All noise reducing devices different from noise barriers and related devices acting on airborne sound propagation, e.g. devices for attenuation of ground borne vibration and on board devices, are out of the scope of this document.

Obsah

ČSN EN ISO 9073-18 This document specifies a test method for the determination of the breaking force of nonwovens using a grab method in conditioned or wet state. This test method is not applicable to materials which have a high percentage of stretch. Comparing test results from tensile testing machines operating on different principles is not applicable. This document specifies methods using constant rate of specimen extension (CRE) tensile testers. Constant-rate-of-loading (CRL) instruments is covered, for information, in ISO 2062:2009, Annex A, in recognition of the fact that these instruments are still in use and can be used by agreement.

Obsah

ČSN EN ISO 12311 This document specifies reference's test methods for determining the properties of sunglasses given in ISO 12312 (all parts). It is applicable to all sunglasses and related eyewear. Other test methods can be used if proven to be equivalent.