Normy

Obsah

ČSN EN 62810 This International Standard relates to a measurement method for complex permittivity of a dielectric rod at microwave frequency. This method has been developed to evaluate the dielectric properties of low-loss materials in coaxial cables and electronic devices used in microwave systems. It uses the TM010 mode in a circular cylindrical cavity and presents accurate measurement results of a dielectric rod sample, where the effect of sample insertion holes is taken into account accurately on the basis of the rigorous electromagnetic analysis. In comparison with the conventional method described in IEC 60556 [2] , this method has the following characteristics: - the values of the relative permittivity e' and loss tangent tan d of a dielectric rod sample can be measured accurately and non-destructively; - the measurement accuracy is within 1,0 % for e' and within 20 % for tan d; - the effect of sample insertion holes is corrected using correction charts presented; - this method is applicable for the measurements on the following condition: frequency: 1 GHz

Obsah

ČSN EN 60940 This international standard provides guidance applicable to information on application of capacitors, resistors, inductors, and complete filter units for electromagnetic interference suppression.

Obsah

ČSN EN 61837-4 ed. 2 Tato norma stanovuje normalizované rozměry a zapojení vývodů hybridních pouzder piezoelektrických součástek založených na IEC 61240:2012, která jsou určena pro technologii povrchové montáže (SMD).

Obsah

ČSN EN 60601-2-10 ed.2 Tato norma specifikuje požadavky na bezpečnost nervových a svalových stimulátorů, pro použití v praxi fyzikální medicíny. Zahrnuje transkutánní elektrické nervové stimulátory (TENS) a elektrické svalové stimulátory (EMS). Minimální bezpečnostní požadavky specifikované v této zvláštní normě jsou považovány za zajištění praktické úrovně bezpečnosti v provozu nervových a svalových stimulátorů.

Obsah

ČSN EN 10293 Tato evropská norma platí pro ocel na odlitky pro obecné použití. Jejich použití zahrnuje stroje (mechanické, elektrické), výrobu vozidel, železnici, zbrojní výrobu, zemědělské stroje, hornictví apod. Tato norma platí i pro případy, kdy odlitky byly svařeny ve slévárně.

Obsah

ČSN EN 636+A1 Tato evropská norma stanoví požadavky na překližované desky definované v EN 313-2 pro všeobecné použití (mimo stavebnictví) a ve stavebnictví v suchém, vlhkém a venkovním prostředí. Uvádí systém klasifikace založený na ohybových vlastnostech. Tuto normu lze použít i pro všechny překližované desky, včetně foliovaných nebo s nátěrem, ale nevztahuje se na materiály nebo postupy používané pro fólie nebo nátěr. Dále se nevztahuje na materiály nebo postupy použité ke zlepšení biologické trvanlivosti. Hodnoty uváděné v kapitole 4 této normy jsou vlastnostmi výrobku, ale nejsou charakteristickými hodnotami pro výpočty při navrhování. Tato norma podává další informace o doplňkových vlastnostech pro určité účely použití.

Obsah

ČSN EN ISO 3233-3 This part of ISO 3233 a simple practical method for calculating the non-volatile matter by volume, NVV, of a coating material from the non-volatile-matter content, NV, the density of the coating material, and the density of the solvents. Using the non-volatile matter by volume results and the density obtained in accordance with this part of ISO 3233, it is possible to calculate the theoretical spreading rate of a coating material. This part of ISO 3233 is not applicable to coating materials which exceed the critical pigment volume concentration (CPVC).

Obsah

ČSN P CEN/TS 16692 Tato technická specifikace popisuje metodu pro stanovení tributylcínu (TBT) v celkových vzorcích vody. Je použitelná pro analýzu TBT v povrchové vodě, která může obsahovat až 500 mg/l nerozpuštěných látek (celkové vzorky vody), v podzemní, pitné a mořské vodě. Pracovní rozsah je 0,04 ng/l až 20 ng/l. Mez stanovitelnosti se většinou určí s použitím hodnoty slepého stanovení získané během validace této metody.

Obsah

ČSN EN 14742 The laboratory assessment of sludge dewaterability is sensitive to the operating procedure adopted for the conditioning step. No generalized ranking of products in order of effectiveness can be given since the ranking changes with the sludge type, dosage of conditioning agent, degree of shearing and dewatering device. The scope of this European Standard applies for sludges and suspensions from: - storm water handling; - urban wastewater collecting systems; - urban wastewater treatment plants; - industrial wastewater that has been treated similarly to urban wastewater (as defined in Directive 91/271/EEC); - water supply plants. This method is applicable to sludge and suspensions of other origin.

Obsah

ČSN EN ISO 16967 This International Standard describes methods for the determination of major elements of solid biofuels respectively of their ashes, which are Al, Ca, Fe, Mg, P, K, Si, Na, Ti. The determination of other elements such as barium (Ba) and manganese (Mn) is also possible with the methods described in this International Standard. This International Standard includes two parts: Part A describes the direct determination on the fuel, this method is also applicable for sulfur and minor elements, Part B gives a method of determination on a prepared 550 °C ash.

Obsah

ČSN ETSI EN 300 253 V2.2.1 The present document applies to earthing and bonding of ICT equipment operating with DC voltage defined in ETSI EN 300 132-2 [i.9], in order to facilitate the installation, operation and maintenance of equipment. It also co-ordinates with the pre-conditions of the installation to achieve the following targets: - safety from electrical hazards; - reliable signal reference; - satisfactory Electromagnetic Compatibility (EMC) performance. The specification of ICT equipment and of the pre-conditions of installation are subject to agreement of the parties (e.g. the supplier and the purchaser) and the procedure to achieve agreement is covered by annex A of the present document. The present document does not cover safety and EMC aspects of the equipment. Those aspects are covered by other relevant standards. The present document does not apply to the installation of ICT equipment in locations other than telecommunication and data centres, e.g. ICT equipment within a customer's building, including subscriber line termination. NOTE: Earthing and bonding of equipment installed in locations other than telecommunication and data centres is covered by CENELEC EN 50310 [i.6].

Obsah

ČSN ETSI EN 301 489-6 V1.4.1 The present document, together with ETSI EN 301 489-1 [1], covers the assessment of Digital Enhanced Cordless Telecommunications (DECT) equipment, and associated ancillary equipment, in respect of ElectroMagnetic Compatibility (EMC). Technical specifications related to the antenna port and emissions from the enclosure port of the radio equipment are not included in the present document. Such technical specifications are found in the relevant product standards for the effective use of the radio spectrum. The present document specifies the applicable test conditions, performance assessment and performance criteria for Digital Enhanced Cordless Telecommunications (DECT) equipment, and associated ancillary equipment. Definitions of types of cordless telecommunications equipment covered by the present document are given in annex A. In case of differences (for instance concerning special conditions, definitions, abbreviations) between the present document and ETSI EN 301 489-1 [1], the provisions of the present document take precedence. The environmental classification and the emission and immunity requirements used in the present document are as stated in ETSI EN 301 489-1 [1], except for any special conditions included in the present document.