Normy

Obsah

ČSN EN ISO 10938 This International Standard applies to displays of optotypes generated by chart projectors and all other visual acuity measurement systems that use recognition of high-contrast optotypes and that are designed for general use, including optotypes printed on media (either opaque or intended for transillumination), those generated electronically, and those produced by optical projection.

Obsah

ČSN EN ISO 11381 This International Standard specifies requirements for ISO metric screw threads for use with spectacle frames. Provision is made for screw threads of the following nominal sizes: S0,8 × 0,2; M1,0 × 0,25; M1,2 × 0,25; M1,4 × 0,3; M1,6 × 0,35 and M2,0 × 0,4 and for related taps and gauges.

Obsah

ČSN EN ISO 4230 This International Standard is a supplement to ISO 2568 and ISO 4231 and specifies the dimensions of hand- and machine-operated circular screwing dies intended for production of taper pipe threads, R series, in accordance with ISO 7-1. With the exception of the die 1/16, the general dimensions of these dies (diameter, thickness and fixing dimensions) are in accordance with ISO 2568 so as to permit the driving of hand-operated dies with the aid of the die stocks defined in that document.

Obsah

ČSN EN 233 This European Standard: - specifies requirements for finished wallpapers, wall vinyls and plastics wallcoverings; - specifies requirements for marking; - gives the designation system. The marking requirements of this standard are primarily for the consumer's information to enable optimum selection of the product. This standard applies to finished wallpapers, wall vinyls and plastics wallcoverings not intended for subsequent decoration supplied in rolls for hanging on indoor walls and ceilings by means of an adhesive covering the whole of the interface between the wallcovering and the support surface. Excluded from this standard are rigid materials, materials not attached or not wholly attached by adhesive, wallcoverings for subsequent decoration, textile wallcoverings and non-decorative wallcoverings such as wall linings or those with special properties, e.g. thermal or acoustic insulation.

Obsah

ČSN EN ISO 1043-3 This part of ISO 1043 provides uniform symbols for components of terms relating to plasticizers to form abbreviated terms. It includes, in general, only those abbreviated terms that have come into established use. The purpose of this part of ISO 1043 is to prevent the occurrence of more than one abbreviated term for a given plasticizer. The symbols are primarily intended to be convenient shorthand for forming abbreviated terms for chemical names in publications and other written matter.

Obsah

ČSN EN 12945+A1 Tato evropská norma specifikuje dvě metody pro stanovení neutralizační hodnoty (NH) materiálů k vápnění půd. Metoda A je použitelná pro všechny materiály k vápnění půd kromě silikátových materiálů. Metoda B je použitelná pro všechny materiály k vápnění půd. Ani jedna metoda nebere správně v potaz potenciální neutralizační hodnotu materiálů obsahujících více než 3 % P2O5. Pro přesnější agronomické posouzení výrobků obsahujících více než 3 % P2O5 se účinnost stanoví podle EN 14984.

Obsah

ČSN EN 16896 This European Standard specifies a procedure for the determination of kinematic viscosity at 40 °C in the range from 2 mm2/s to 6 mm2/s by calculation from dynamic viscosity and density of middle distillate fuels, fatty acid methyl ester fuels (FAME) and mixtures of these using the Stabinger-type viscosimeter. The result obtained using the procedure described in this standard depends on the behaviour of the sample. This European Standard should be used predominantly on liquids whose shear stress and shear rate are proportional (Newtonian flow behaviour). However, if the viscosity changes significantly with the shear rate, comparison with other measuring methods is only permissible at similar shear rates.

Obsah

ČSN EN 16807 Norma ČSN EN 16807 stanovuje kritéria a specifikakce pro biomaziva a maziva z biologického materiálu, definuje termín biomazivo a mazivo z biologického materiálu, minimální požadavky pro všechny druhy biomaziv a maziv z biologického materiálu. Uvádí využitelné metody zkoušení pro zkoušení biologické rozložitelnosti biomaziv. Dále definuje ekotoxicitu biomaziv a způsob jejího hodnocení, obsah uhlíku v biologickém materiálu a normy pro jeho stanovení a posuzování vhodnosti maziva pro daný účel. Kromě toho definuje minimální hodnoty pro obsah biologického materiálu v biomazivech, biologickou rozložitelnost olejů a plastických maziv, ekotoxicitu, a výkonnost. V tabulkách uvádí metody zkoušení pro stanovení obsahu 14C a použití skupiny biomaziv.

Obsah

ČSN EN 1766 ed. 2 This European Standard specifies the composition, characteristics and preparation procedure for reference concrete substrates, which are to be used in the test methods to measure performances of products and systems for the repair and protection of concrete structures. The provisions of this Standard are applicable to concrete with a maximum aggregate size of 16 mm or 20 mm or with a maximum aggregate size of 8 mm or 10 mm.

Obsah

ČSN EN 16175-1 This European Standard specifies a method for the determination of mercury in aqua regia or nitric acid digests of sludge, treated biowaste and soil, obtained according to EN 16173 or EN 16174 using cold-vapour atomic absorption spectrometry (CV-AAS). The lower working range limit is 0,03 mg/kg (dry matter basis).

Obsah

ČSN EN 16175-2 This European Standard specifies a method for the determination of mercury in aqua regia or nitric acid digests of sludge, treated biowaste and soil, obtained according to EN 16173 or EN 16174 using cold-vapour atomic fluorescence spectrometry (CV-AFS). The lower working range limit is 0,003 mg/kg (dry matter basis).

Obsah

ČSN ETSI EN 301 091-2 V2.1.1 The present document specifies technical characteristics and methods of measurements for radar equipment for fixed infrastructure Transport and Traffic Telematic (TTT) applications in the frequency range from 76 GHz to 77 GHz. It covers integrated transceivers and separate transmit/receive modules. The present document does not necessarily include all the characteristics which may be required by a user, nor does it necessarily represent the optimum performance achievable. The present document covers the essential requirements of article 3.2 of Directive 2014/53/EU [i.2] under the conditions identified in annex A. In case of differences (for instance concerning special conditions, definitions, abbreviations) between the present document and ETSI EN 303 396 [1], the provisions of the present document take precedence.