Normy

Obsah

ČSN EN ISO 16526-1 This part of ISO 16526 specifies a method for the direct and absolute measurement of the average high voltage of constant potential (DC) X-ray systems on the secondary side of the high voltage generator. The intention is to check the correspondence with the indicated high voltage value on the control unit of the X-ray system. This method is applied to assure a reproducible operation of X-ray systems because the voltage influences particularly the penetration of materials and the contrast of X-ray images and also the requirements concerning the radiation protection.

Obsah

ČSN EN ISO 16526-2 This part of ISO 16526 specifies a constancy check of a X-ray system where mainly the X-ray voltage is checked the tube current and the constitution of the target which can be changing due to ageing of the tube. The thick filter method is based on a measurement of the dose rate behind a defined thick filter using defined distances between the X-ray tube, the filter and the measuring device. This method is very sensitive to changes of the voltage, but it does not provide an absolute value for the X-ray tube voltage. Therefore, a reference value is needed and, it is recommended to find this reference, for example, within the acceptance test of the system. The thick filter method is a rather simple technique and may be applied by the operator of an X-ray system to perform regularly a constancy check of the system. The method can also be applied for consistency checks after changing components which may affect the X-ray tube voltage. This method can be applied for all types of X-ray systems, i. e. for constant potential, half wave and impulse wave generators with a tube current larger than 1 mA.

Obsah

ČSN EN ISO 16526-3 This part of ISO 16526 specifies the test method for a non-invasive measurement of X-ray tube voltages using the energy spectrum of X-rays (spectrometric method). It covers the voltage range from 10 kV to 500 kV. The intention is to check the correspondence of the actual voltage with the indicated value on the control panel of the X-ray unit. It is intended to measure the maximum energy only and not the complete X-ray spectrum. The procedure is applicable for tank type and constant potential X-ray units.

Obsah

ČSN EN IEC 62932-1 Tato část IEC 62932 se týká průtokových bateriových energetických systémů (FBES) používaných v aplikacích pro akumulaci elektrické energie (EES) a poskytuje hlavní terminologii a obecná hlediska této technologie, včetně termínů nezbytných pro definování jednotek parametrů, zkušebních metod, bezpečnosti a problematiky životního prostředí.

Obsah

ČSN EN ISO 11357-2 This document specifies methods for the determination of the glass transition temperature and the step height related to the glass transition of amorphous and partially crystalline plastics.

Obsah

ČSN EN ISO 23153-1 This document establishes a system of designation for polyetheretherketone (PEEK) moulding and extrusion materials which can be used as the basis for specifications. Polyetheretherketone polymer chains are composed of phenylene rings linked in (1,4) position by a sequence of two ether groups followed by one ketone group. The grades of PEEK plastics are differentiated from each other by a classification system based on appropriate levels of the designatory properties a) melt viscosity or melt volume-flow rate; b) tensile modulus; c) tensile strength; and on information about the intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials. The designation system is applicable to all polyetheretherketones. It applies to materials ready for normal use in the form of powder, granules or pellets, unmodified or modified by colourants, fillers, reinforcements or other additives. It is not intended to imply that materials having the same designation necessarily give the same performance. This document does not provide engineering data, performance data or data on processing conditions which can be required to specify a material for a particular application and/or method of processing. If such additional properties are required, they are intended to be determined in accordance with the test methods specified in ISO 23153-2, if suitable. In order to specify a thermoplastic material for a particular application or to ensure reproducible processing, additional requirements are given in data block 5.

Obsah

ČSN EN 17333-3 This document specifies test methods for the evaluation of the application properties for moisture curing, self-curing activatable or water drying foams dispensed from single pressurized foam containers. This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this document to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use. The following test methods are described: - Method 1 - Cutting time: This test method describes how to determine the hardening time of a dispended froth until it could be cut. - Method 2 - Tack free time: This test method describes how to determine the tack free time of a freshly foamed OCF. - Method 3 - Sagging: This test method describes how to evaluate the sagging behaviour and determine the biggest joint possible before dispensed froth slips off.

Obsah

ČSN EN 13495 Tento dokument specifikuje vybavení a postupy pro stanovení únosnosti (soudržnosti) sestav vnějších tepelněizolačních kompozitních systémů (ETICS) při působení tahových a/nebo smykových sil.

Obsah

ČSN 73 0843 ed. 2 Tato norma platí pro projektování požární bezpečnosti nových objektů a prostorů v objektech jiného účelu obsahujících radiokomunikační, telekomunikační a poštovní provozy, pro projektování změn staveb těchto objektů a pro projektování změn staveb, jimiž se upravují objekty a prostory jiného účelu na objekty a prostory obsahující radiokomunikační, telekomunikační a poštovní provozy. Norma stanoví specifické požadavky požární bezpečnosti na objekty a prostory spojů a poštovní provozy v návaznosti na ČSN 73 0802, ČSN 73 0804 a ČSN 73 0810. Ustanovení ČSN 73 0802, ČSN 73 0804 a ČSN 73 0810 platí i pro objekty a prostory spojů a poštovní provozy, pokud nejsou zpřesněny specifickými ustanoveními této normy. Při projektování změn staveb platí tato norma pro měněné části objektu, přičemž změnou stavby nesmí dojít ke snížení požární bezpečnosti celého objektu, zejména ke snížení bezpečnosti osob nebo ke ztížení zásahu jednotek požární ochrany. Norma platí pro ty změny, které podléhají stavebnímu nebo kolaudačnímu řízení ). Tato norma neplatí pro projektování nových prostorů jiného účelu (restaurační, vyhlídkové, ubytování a bydlení, garáže apod.) a jejich změn v objektech spojů a poštovních provozů. Tyto prostory se řeší podle samostatných technických norem obsahujících požadavky požární bezpečnosti staveb. Při souběhu požadavků (např. únikové cesty, přístupové komunikace pro požární vozidla apod.) je nutno uplatnit požadavky vyšší bezpečnosti.

Obsah

ČSN EN 12697-19 This document specifies a method for determining the vertical and horizontal permeability of cylindrical specimens of bituminous mixtures with interconnecting voids. The document applies to specimens cored out of the road, specimens from laboratory made slabs or laboratory specimens prepared with a compaction device provided the thickness of the specimen is not less than twice the nominal maximum particle size of the aggregate in the mixture. The nominal diameter of specimens should be either 100 mm or 150 mm unless the nominal maximum particle size of the aggregate size exceeds 22 mm, when the nominal diameter is 150 mm.

Obsah

ČSN EN 12697-45 This document specifies a test method to assess the durability of adhesion in base and binder course asphalt mixtures. The Saturation Ageing Tensile Stiffness (SATS) conditioning regime is used to age the specimens in the presence of water. A comparative test for assessing their performance before and after conditioning is also conducted. The applicability of this test method is limited to bituminous specimens with consistent air voids contents and hard binder, in particular, to asphalt concrete mixtures with a binder content between 3,5 % and 5,5 %, air voids contents between 6 % and 10 % and 10/20 pen hard paving grade bitumen. The test is intended to be used as a screening test for the assessment of a combination of aggregate, filler and additives with respect to the retained adhesion properties after simulated ageing in a moist atmosphere for lean/stiff base and binder course mixtures.

Obsah

ČSN EN ISO 22570 This document specifies requirements and test methods for spoons and bone curettes used in dentistry for oral surgical procedures. It specifies shapes and dimensions as well as information for marking.