本文件规定了用于本地和社区网络的DLMS/COSEM有线和无线M-Bus通信配置。
设置和管理M-Bus设备的M-Bus的通信信道和M-Bus网络，以及注册从站设备和(必要时)中继器，不在本文件的范围内。
本通信配置标准的范围限于与COSEM数据模型和DLMS/COSEM应用层结合的通信协议应用方面。通信协议特有的数据结构不在本文件的范围之内。任何特定项目的数据结构和数据内容均可由特定项目的配套规范提供。
附录A提供了关于M-Bus帧结构、寻址方案和编码示例的信息。
附录B规定了用于建立和管理有线和无线M-Bus通信信道的COSEM接口类。
附录C提供了典型通信实例的MSC(消息时序图)。

定价： 59元 / 折扣价： 51 元 加购物车

GB/T 29001规定了机床数控系统NCUCBus的数据类型和基本的数据传输方式，确立了NCUCBus用于机床数控系统及工业自动化控制过程而制定的通信协议规范。
GB/T 29001的本部分定义了NCUCBus一致性测试的系统结构与测试内容。
本部分适用于声明为基于NCUCBus标准的机床数控系统及其组件的一致性测试。其他用途的数控系统可参照本部分。

定价： 103元 / 折扣价： 88 元 加购物车

GB/T 29001规定了机床数控系统NCUCBus现场总线的数据类型和基本的数据传输方式，确立了NCUCBus用于机床数控系统及工业自动化控制过程而制定的通信协议规范。
GB/T 29001的本部分规定了NCUCBus网络拓扑结构、设备模型、网络层次模型、通信状态机的主要内容和通信过程一般原则。
本部分适用于机床数控系统。其他用途的数控系统可参照本部分。

定价： 31元 / 折扣价： 27 元 加购物车

GB/T 29001规定了机床数控系统NCUCBus现场总线（以下简称NCUCBus）的数据类型和基本的数据传输方式，确立了NCUCBus用于机床数控系统及工业自动化控制过程而规定的通信协议规范。
GB/T 29001的本部分规定了NCUCBus物理层的要求，同时规定了介质和网络组态的要求。
本部分适用于机床数控系统。其他用途的数控系统可参照本部分。

定价： 38元 / 折扣价： 33 元 加购物车

GB/T 29001规定了机床数控系统NCUCBus（NC Union of China Field Bus，数控联盟总线，以下简称NCUCBus）的数据类型和基本的数据传输方式，确立了NCUCBus用于机床数控系统及工业自动化控制过程而制定的通信协议规范。
GB/T 29001的本部分规定了NCUCBus数据链路层提供各装置之间基本的、有实效性的报文通信规则，同时定义了NCUCBus数据链路层协议。
本部分适用于机床数控系统。其他用途的数控系统可参照本部分。

定价： 43元 / 折扣价： 37 元 加购物车

GB/T 29001规定了机床数控系统NCUCBus现场总线（以下简称NCUCBus）的数据类型和基本的数据传输方式，确立了NCUCBus用于机床数控系统及工业自动化控制过程而规定的通信协议规范。
GB/T 29001的本部分规定了机床数控系统NCUCBus的应用层协议规范。
本部分适用于机床数控系统。其他用途的数控系统可参照本部分。

定价： 113元 / 折扣价： 97 元 加购物车

定价： 819元 / 折扣价： 697 元

定价： 689元 / 折扣价： 586 元 加购物车

定价： 689元 / 折扣价： 586 元 加购物车

定价： 481元 / 折扣价： 409 元 加购物车

5.1 In this test method fire test response characteristics of a school bus seat assembly are assessed following ignition by a square gas burner.5.2 This test method is similar in concept to a fire test currently used, and which has been in such use for many years, as the industry standard for flammability testing of school bus seats (see Appendix X1). However, in this test method the paper bag has been replaced by a gas burner as the ignition source.5.3 The US federal government has issued a flammability test applicable to interior materials in road vehicles, FMVSS 302. FMVSS 302 remains the only regulatory test for assessing fire-test-response characteristics of school bus seats.5.4 ASTM has issued Test Method D5132 in order to provide a more standardized way of conducting FMVSS 302.5.5 The test method described in this document provides a significantly higher challenge to school bus seats than the FMVSS 302 federal regulatory test. Therefore, any seat assembly that performs acceptably in this test is likely to meet the requirements of FMVSS 302.5.6 It is clear that those seat assemblies that exhibit little or no flame spread, short times to flame extinction and little mass loss in this test are likely to exhibit improved performance in an actual fire situation compared to seat assemblies that burn vigorously and have high mass loss.5.7 This test is primarily useful to distinguish products that, when exposed to these fire conditions, will become fully involved in fire from other products that will not.1.1 This is a fire-test-response standard.1.2 This test method assesses the burning behavior of upholstered seating used in school buses by measuring specific fire-test responses when a school bus seat specimen is subjected to a specified flaming ignition source under normally ventilated conditions.1.3 The ignition source is a gas burner.1.4 This fire test is primarily useful to distinguish products that, when exposed to an ignition source, will become fully involved in fire from other products that will not.1.5 Data are obtained describing the burning behavior of the seat assemblies from a specific ignition source until all burning has ceased.1.6 This test method does not provide information on the fire performance of upholstered seating in fire conditions other than those conditions specified.1.7 The burning behavior is visually documented by photographic or video recordings, whenever possible.1.8 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.9 This standard is used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products or assemblies under actual fire conditions.1.10 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests.1.11 This standard 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 standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.12 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

This specification covers 6101 aluminum-alloy extruded bar, rod, tube, pipe, (Schedules 40 and 80), structural profiles, and profiles in selected tempers for use as electric conductors. The bars, rods, tubes, pipes, structural profiles and profiles shall be produced by hot extrusion or by similar methods. Pipe or tube may be produced through porthole or bridge type dies. Tensile properties of the specimens such as tensile and yield strengths and bending shall be determined by tension test and bending test, respectively. Electrical resistivity and conductivity shall be determined.1.1 This specification covers 6101 aluminum-alloy extruded bar, rod, tube, pipe, (Schedules 40 and 80), structural profiles, and profiles in selected tempers for use as electric conductors as follows:1.1.1 Type B—Hot-finished bar, rod, tube, pipe, structural profiles and profiles in T6, T61, T63, T64, T65, and H111 tempers with Type B tolerances, as shown in the “List of ANSI Tables of Dimensional Tolerances.”1.1.2 Type C—Hot-finished rectangular bar in T6, T61, T63, T64, T65, and H111 tempers with Type C tolerances as listed in the tolerances and permissible variations tables.1.2 Alloy and temper designations are in accordance with ANSI H35.1. The equivalent Unified Numbering System alloy designation in accordance with Practice E527 is A96101 for Alloy 6101.NOTE 1: Type A material, last covered in the 1966 issue of this specification, is no longer available; therefore, requirements for cold-finished rectangular bar have been deleted.1.3 The values stated in either SI or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

5.1 A major factor affecting the life of insulating materials is thermal degradation. It is possible that other factors, such as moisture and vibration, will cause failures after the material has been weakened by thermal degradation.5.2 Electrical insulation is effective in electrical equipment only as long as it retains its physical and electrical integrity. The following are potential indicators of thermal degradation: weight change, porosity, crazing, and generally a reduction in flexibility. Thermal degradation is usually accompanied by an ultimate reduction in dielectric breakdown.5.3 This test method is useful in determining the thermal endurance of coating powders applied over a copper or aluminum substrate material.1.1 This test method provides a procedure for evaluating thermal endurance of coating powders by determining the length of aging time at selected elevated temperatures required to achieve dielectric breakdown at room temperature at a pre-determined proof voltage. Thermal endurance is expressed in terms of a temperature index.1.2 This test method is applicable to insulating powders used over a substrate material of copper or aluminum.1.3 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems is likely to result in non-conformance with the standard.1.4 This standard 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 standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 7.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

This specification covers the manufacturing and testing requirements for copper clad aluminum rectangular bar for electrical (bus) applications. Six classes of copper-clad aluminum bar are covered:1.1 This specification covers copper clad aluminum rectangular bar for electrical (bus) applications.1.2 Six classes of copper-clad aluminum bar are covered as follows:Class 20A—Nominal 20 volume % copper, annealed.Class 25A—Nominal 25 volume % copper, annealed.Class 30A—Nominal 30 volume % copper, annealed.Class 20H—Nominal 20 volume % copper, hard-worked.Class 25H—Nominal 25 volume % copper, hard-worked.Class 30H—Nominal 30 volume % copper, hard-worked.1.3 The values stated in inch-pound units are to be regarded as the standard, except for resistivity and density, where the SI units are the standard. The values given in parentheses are for information only.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

This specification establishes the requirements for copper conductor bars, rods, and shapes for both electrical (bus) and general applications. Products shall be produced in tempers O60 (soft annealed), and H04 (hard). Products shall be sampled and prepared, then tested accordingly to examine their conformance to dimensional (mass, diameter, thickness, width, shape, specified and stock lengths, straightness, edge contour, and radius of edges or corners), mechanical (tensile, yield and bend strengths, elongation, Rockwell hardness, and embrittlement), electrical resistivity, and chemical composition requirements.1.1 This specification2 establishes the requirements for copper conductor bar, rod, and shapes for electrical (bus) applications and rod, bar, and shapes for general applications.1.1.1 The products for electrical (bus) applications shall be made from the following coppers:3Copper UNS No.3 Reference Designation       C10100   OFE  C10200   OF  C10300   OFXLP  C10400, C10500, C10700   OFS  C10920, C10930, C10940   —  C11000   ETP  C11020   FRHC  C11300, C11400, C11500, C11600   STP  C12000   DLP1.1.1.1 The product may be furnished from any copper listed unless otherwise specified in the contract or purchase order.1.2 The product for general applications shall be made from any of the coppers in 1.1.1 or the following coppers:Copper UNS No.3 Reference Designation C10800  OFLPC12200 DHP1.2.1 The product may be furnished from any copper listed above unless otherwise specified in the contract or purchase order. Other coppers may be used upon agreement between the supplier and purchaser.1.3 Units—The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.NOTE 1: Material for hot forging will be found in Specification B124/B124M.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车