Normy

Obsah

ČSN EN 13878 (30 0010) This document defines, in alphabetical order, terms relating to leisure accommodation vehicles which are caravans, caravan holiday homes and motor caravans.

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ČSN EN IEC 61169-24 ed. 3 This part of IEC 61169, which is a sectional specification (SS), provides information and rules for the preparation of detail specifications (DS) for RF coaxial connectors with screw coupling, typically for use in 75 cable networks (type F). It describes the interface dimensions with gauging information and the mandatory tests selected from IEC 61169-1, applicable to all DS relating to type F connectors. This specification indicates the recommended performance characteristics to be considered when writing a DS and covers test schedules and inspection requirements.

Obsah

ČSN EN IEC 63137-1 This part of IEC 63137 defines general requirements for standard test radio frequency (RF) connectors (grade 0), including terms and definitions, ratings and characteristics, general requirements, test methods, quality assessment procedures, and etc. Standard test radio frequency (RF) connectors (grade 0) are intended to measure grade 1 and grade 2 RF connectors for electrical performances. Typically, a standard test radio frequency (RF) connector (grade 0) is an adapter with one end (normally a precision connector interface) which can be connected with measurement equipment and the other end (normally a standard test connector interface) which can be connected with grade 1 or grade 2 connectors. This specification applies to grade 0 standard test connectors (called connector, hereinafter).

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ČSN EN IEC 60539-2 ed. 2 Tato norma se používá pro termistory pro povrchovou montáž se záporným teplotním součinitelem, typicky vyráběné z materiálů s přechodem kov-oxid s polovodivými vlastnostmi. Tyto termistory mají pokovené kontaktní plochy nebo pájecí proužky a jsou určeny k přímé montáži na podložku pro hybridní obvody nebo na desky s plošnými spoji.

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ČSN EN 50342-2 ed. 2 Tento dokument platí pro olověné baterie používané pro startování, osvětlení a zapalování osobních automobilů a lehkých nákladních vozidel se jmenovitým napětím 12 V. Všechny baterie v souladu s tímto dokumentem mohou být upevněny k vozidlu za okrajové lišty nádoby nebo pomocí držáku obepínajícího víko nádoby.

Obsah

ČSN EN ISO 20088-3 (38 6660) This document describes a method for determining the resistance of a cryogenic spill protection (CSP) system to a cryogenic jet as a result of a pressurized release which does not result in immersion conditions. It is applicable where CSP systems are installed on carbon steel and will be in contact with cryogenic fluids. A cryogenic jet can be formed upon release from process equipment operating at pressure (e.g. some liquefaction processes utilize 40 to 60 bar operating pressure). Due to high pressure discharge, the cryogenic spillage protection can be compromised by the large momentum combined with extreme cryogenic temperature. Although the test uses liquid nitrogen as the cryogenic liquid, the test described in this document is representative of a release of LNG, through a 20 mm orifice or less, at a release pressure of 6 barg or less, based upon simulated parameters 1 m from the release point. Confidence in this test being representative is based upon a comparison of the expected dynamic pressure of the simulated release in comparison with dynamic pressure from releases in accordance with this document. It is not practical in this test to cover the whole range of cryogenic process conditions found in real plant conditions; in particular the test does not cover high pressure cryogenic jet releases that might be found in refrigeration circuits and in LNG streams immediately post-liquefaction. Liquid nitrogen is used as the cryogenic medium due to the ability to safely handle the material at the pressures described in this document. The test condition is run at nominally 8 barg pressure. ISO 20088-1 covers cryogenic release scenarios which can lead to pooling conditions for steel work protected by cryogenic spill protection as a result of a jet release or low pressure release of LNG or liquid nitrogen. ISO 20088-2 covers vapour phase exposure conditions as a result of a jet release or low pressure release of LNG or liquid nitrogen.

Obsah

ČSN P CEN ISO/TS 18090-1 This part of ISO/TS 18090 is directly applicable to pulsed X-radiation with pulse duration of 0,1 ms up to 10 s. This covers the whole range used in medical diagnostics at the time of publication. Some specifications may also be applicable for much shorter pulses; one example is the air kerma of one pulse. Such a pulse may be produced, e.g. by X-ray flash units or high-intensity femtosecond-lasers. Other specifications are not applicable for much shorter pulses; one example is the time-dependent behaviour of the air kerma rate. This may not be measurable for technical reasons as no suitable instrument is available, e.g. for pulses produced by a femtosecond-laser. This part of ISO/TS 18090 specifies the characteristics of reference pulsed radiation for calibrating and testing radiation protection dosemeters and dose rate meters with respect to their response to pulsed radiation. The radiation characteristics includes the following: a) time-dependent behaviour of the air kerma rate of the pulse; b) time-dependent behaviour of the X-ray tube high voltage during the pulse; c) uniformity of the air kerma rate within a cross-sectional area of the radiation beam; d) air kerma of one radiation pulse; e) air kerma rate of the radiation pulse; f) repetition frequency. This part of ISO/TS 18090 does not define new radiation qualities. Instead, it uses those radiation qualities specified in existing ISO and IEC standards. This part of ISO/TS 18090 gives the link between the parameters for pulsed radiation and the parameters for continuous radiation specifying the radiation qualities. It does not specify specific values or series of values for the pulsed radiation field but specifies only those limits for the relevant pulsed radiation parameters that are required for calibrating dosemeters and dose rate meters and for determining their response depending on the said parameters. The pulse parameters with respect to the phantom-related quantities were determined using conversion coefficients according to ISO 4037 (all parts). This is possible as the radiation qualities specified in existing ISO and IEC standards are used. A given reference pulsed X-ray facility is characterized by the parameter ranges over which the full specifications and requirements according to this part of ISO/TS 18090 are met. Therefore, not all reference pulsed X-ray facilities can produce pulses covering the same parameter ranges.

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ČSN EN 1753 This document specifies the grades and the corresponding requirements for cast alloyed magnesium materials. This document specifies two groups of cast magnesium alloy grades by a classification based on the chemical composition. The first group deals with grades for magnesium alloy ingots. The second group deals with grades for magnesium alloy castings. This document also specifies mechanical properties measured on test pieces machined from cast samples. This document does not cover technical delivery conditions for magnesium alloy castings (see EN 1559-1 [7] and EN 1559-5 [8]).

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ČSN P CEN/TS 17062 This Technical Specification describes a method for the analysis of pesticide residues in fatty oils of plant origin (essential oils are excluded). It has been validated in an interlaboratory test with olive oil. However, laboratory experiences have shown that this method is also applicable to other kinds of oils such as sunflower seed oil, sesame oil, flax seed oil, rape seed oil, grape seed oil, thistle oil and pumpkin seed oil.

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ČSN EN 927-3 This document specifies a natural weathering test for exterior wood coating systems mainly intended for decoration and protection of planed and sawn wood. The test provides a means of evaluating the performance of a wood coating system during outdoor exposure. It forms the basis for the performance specification in accordance with EN 927-2. It also facilitates the comparison of coating systems performance on different substrates including the wood species, or other wood modifications.

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ČSN EN 1295-1 Tento dokument stanovuje požadavky na statický návrh potrubí pro zásobování vodou, potrubí pro stokové sítě a kanalizační přípojky a jiná potrubí ve vodním hospodářství, která jsou provozována při atmosférickém tlaku, s vnitřním přetlakem nebo podtlakem oproti atmosférickému tlaku. Tento dokument je doplněn návody k použití národních návrhových metod, zavedených a používaných v členských zemích CEN v době zpracování tohoto dokumentu. Tyto návody jsou důležitým zdrojem odborných projekčních znalostí, nemohou však řešit všechny možné zvláštní případy. V takových případech lze použít rozšířených nebo omezených základních výpočtových metod. Protože v praxi nejsou ve stadiu navrhování vždy k dispozici přesné podrobnosti, včetně druhů zemin a podmínek ukládání, zůstává volba návrhových parametrů na úvaze projektanta. V této souvislosti mohou tyto návody poskytovat jen obecné údaje a doporučení.

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ČSN EN 17211 This document provides guidance for survey design, equipment specification, survey methods, sampling and data handling of macroalgae and marine angiosperms such as Zostera in the intertidal soft bottom environment. It does not include polyeuryhaline terrestrial angiosperms that are found in saltmarshes. Ruppia is a genus of angiosperms that can be found in brackish water. This document can also be applied to the study of Ruppia in these environments. The document comprises: - development of a mapping and sampling programme; - requirements for mapping and sampling equipment; - procedures for remote sensing data collection; - procedures for direct mapping and sampling in the field; - recommendations for taxon identification and biomass determination; - data handling.