This part of IEC/IEEE 62395 provides detailed recommendations for the system design, installation, maintenance and repair of electrical resistance trace heating systems in industrial and commercial applications. This document does not include or provide for any applications in potentially explosive atmospheres. This document pertains to trace heating systems that can comprise either factory fabricated or field-assembled (work-site) units, and which can be series or parallel trace heaters, or… read more surface heaters (heater pads or heater panels) that have been assembled and/or terminated in accordance with the manufacturer's instructions. The products covered by this document are intended to be installed by persons who are suitably trained in the techniques required and that only trained personnel carry out especially critical work, such as the installation of connections and terminations. Installations are intended to be carried out under the supervision of a qualified person who has undergone supplementary training in electric trace heating systems. This document does not cover induction, impedance or skin effect heating. Trace heating systems and surface heating systems can be grouped into different types of installations. These are characterized by different requirements for testing and are usually certified for a specific type of installation or application. Typical applications for the different types of installation are shown in Table 1. read less

定价： 元 加购物车

This standard provides the means to define and describe signals used in testing. It provides a set of common basic signal definitions, built upon formal mathematical specifications, so that signals can be combined to form complex signals usable across all test platforms. The standard provides support for structural textual languages and programming language interfaces for interoperability.

定价： 元 加购物车

This part of IEC/IEEE 62582 contains methods for condition monitoring of organic and polymeric materials in instrumentation and control systems using tensile elongation techniques in the detail necessary to produce accurate and reproducible measurements. This document includes the requirements for selection of samples, the measurement system and conditions, and the reporting of the measurement results. The different parts of IEC/IEEE 62582 are measurement standards, primarily for use in the… read more management of ageing in initial qualification and after installation. IEC/IEEE 62582-1 includes requirements for the application of the other parts of IEC/IEEE 62582 and some elements which are common to all methods. Information on the role of condition monitoring in qualification of equipment important to safety is found in IEC/IEEE 60780-323. This document is applicable to non-energised equipment. read less

定价： 元 加购物车

This International Standard applies to outdoor and indoor bushings of any voltage used on DC systems, of capacitance graded or gas insulated types for use as components of liquid-filled converter transformers and smoothing reactors, as well as air-to-air DC bushings. It applies to both line commutated converter (LCC), as well as voltage source converter (VSC) technologies. This document does not apply to the following: • cable terminations (potheads); • bushings for instrument transformers; •… read more bushings for test power supplies; • bushings applied with gaseous insulation (other than air at atmospheric pressure) external to the bushing; • bushings for industrial application; • bushings for traction application; • bushings for distribution class transformers. This document refers to IEC 60137 for general terms and conditions and defines the special terms used, operating conditions, ratings, test procedures as well as general mechanical and electrical requirements for bushings for DC application. read less

定价： 元 加购物车

The scope of this standard is to specify provision of connectionless user data confidentiality, frame data integrity, and data origin authenticity by media access independent protocols and entities that operate transparently to MAC Clients.

定价： 元 加购物车

定价： 元 加购物车

This part of ISO/IEC/IEEE 24748 - specifies the processes from ISO/IEC/IEEE 15288 that implement systems engineering management for the life cycles of technical solutions, - describes a required information item, termed the Systems Engineering Management Plan (SEMP) for the technical management and execution of the systems engineering of technical solutions, - provides requirements and guidance for the content of the required information item.

定价： 元 加购物车

This document defines requirements and includes guidance for design, development, and evaluation of effective and usable user assistance (UA) for mobile applications. It includes principles that can be applied to build an effective UA, focusing on some key issues, e.g., the smaller screen size of mobile devices. The document covers both the transformation of user assistance content developed for other formats (responsive design) and the development of content specifically for mobile use. It… read more describes the processes for designing, testing, and maintaining the UA contents. It presents key concepts, including the target user (first time users or expert users), the business use case addressed by the mobile application, and their associated effects on UA contents. The document focuses on writing UA contents, integrated with multimedia contents (video, music, images). It includes guidance for the translation of UA contents. This document does not include definition (technical specification) of the visual, auditory, tactile and other sensorial input and output methods for the mobile device interfaces. read less

定价： 元 加购物车

定价： 元 加购物车

定价： 元 加购物车

定价： 无文本

定价： 无文本

定价： 无文本

定价： 无文本

定价：