This standard defines the air interface for radiating transceiver radio tags using long wavelength signals(kilometric and hectometric frequencies, <450 kHz). Conforming devices can have very low power consumption (a few microwatts on average), while operating over medium ranges (0.5 to 30 meters) and at low data transfer speeds (300-9600 bps). They are well suited for visibility networks, sensors, effectors and battery operated displays. This standard fills a gap between non-network-based RFID standards (e.g., ISO/IEC CD 15961-3, ISO 18000-6C or ISO 18000-7) and existing high bandwidth network standards such as IEEE 802.11 and IEEE 802.15.4.

定价： 110元 / 折扣价： 94 元

This standard is for a Protection Profile for Hardcopy Devices in a commercial information processing environment in which a moderate level of document security, network security, and security assurance are required. Typically, the day-to-day proprietary and nonproprietary information needed to operate an enterprise will be handled by this environment. This environment will be known as "Operational Environment B."

定价： 78元 / 折扣价： 67 元

This standard is for a Protection Profile for Hardcopy Devices in a public-facing environment in which document security is not guaranteed, but access control and usage accounting are important to the operator of the environment. A retail copy center, public library, Internet café, and hotel business center are typical applications of this environment. This environment will be known as "Operational Environment C."

定价： 235元 / 折扣价： 200 元

Dimensions and strength requirements for anchor shackles used in overhead transmission and distribution line hardware are covered in this standard.

定价： 85元 / 折扣价： 73 元

This standard applies to all indoor and outdoor types of ac high-voltage circuit breakers rated above 1000 V and rated on a symmetrical current basis.

定价： 107元 / 折扣价： 91 元

This standard provides the preferred ratings for low-voltage ac (635 V and below) power circuit breakers,fused low-voltage ac (600 V and below) power circuit breakers, general purpose dc (325 V and below) power circuit breakers, and low-voltage dc (3200 V and below) power circuit breakers.

定价： 87元 / 折扣价： 74 元

This standard establishes specifications for high-voltage (above 1000 V) expulsion-type distribution-class fuses, fuse cutouts, fuse disconnecting switches, their associated fuse links and disconnecting cutouts, and accessories for these devices. All of these devices are intended for use on alternating current distribution systems. These specifications apply to the following specific types of equipment: a) Open and enclosed types of fuses and fuse cutouts b) Open and enclosed fuse disconnecting switches c) Fuse links of the type used exclusively with distribution-class fuses, fuse cutouts, and fuse disconnecting switches d) Open-link types of fuses, cutouts, and their associated fuse links e) Open and enclosed types of disconnecting cutouts f) Fuse supports, fuse mountings and fuse hooks of the type used exclusively with distribution-class fuses, fuse cutouts, fuse disconnecting switches, and disconnecting cutouts g) Fuseholders and removable switch blades of the type used exclusively with distribution-class fuse supports h) Mounting brackets used for distribution-class equipment and other accessories

定价： 89元 / 折扣价： 76 元

This guide covers the application of metal-oxide surge arresters (see IEEE Std C62.11TM-2005) to safeguard electric power equipment against the hazards of abnormally high voltage surges of various origins. This application guide does not cover the application of low-voltage surge protective devices below 1000 V alternating current (ac), except when applied to the secondary of a transformer.

定价： 172元 / 折扣价： 147 元

This standard applies to surge protectors for application on multi-conductor and coaxial, balanced or unbalanced, data, communications, and signaling circuits with voltages less than or equal to 1000 V rms, or 1200 V dc. These surge protectors are intended to limit voltage surges, current surges, or both. This standard is not intended to cover individual device components. Installation of all surge protectors SPDs) must be in conformance with the requirements of applicable local and national electrical codes. Specifically excluded from this standard are protectors for low-voltage power circuit applications. The surge protectors covered by this standard are to be tested by means of the connections or terminations that are used when the surge protector is installed in the field. For surge protectors that are intended to be used with a base or connector, that base or connector shall be part of the tests. The tables of typical performance values of this standard provide a means of comparison among various surge protectors. They also provide a common engineering language beneficial to the user and manufacturer of surge protectors used in low-voltage data, communications, and signaling circuits.

定价： 128元 / 折扣价： 109 元

This standard provides methods for the electrical characterization of carbon nanotubes(CNTs). The methods will be independent of processing routes used to fabricate the CNTs.

定价： 121元 / 折扣价： 103 元

The standard defines the building blocks comprising (i) network resource managers, (ii) device resource managers, and (iii) the information to be exchanged between the building blocks, for enabling coordinated network-device distributed decision making that will aid in the optimization of radio resource usage, including spectrum access control, in heterogeneous wireless access networks. The standard is limited to the architectural and functional definitions at a first stage. The corresponding… read more protocols definition related to the information exchange will be addressed at a later stage. read less

定价： 235元 / 折扣价： 200 元

This standard is for a Protection Profile for Hardcopy Devices in a restrictive commercial information processing environment in which a relatively high level of document security, operational accountability, and information assurance are required. The typical information processed in this environment is trade secret, mission critical, or subject to legal and regulatory considerations, such as for privacy or governance. This environment is not intended to support life-critical or national… read more security applications. This environment will be known as "Operational Environment A." read less

定价： 78元 / 折扣价： 67 元

This International Standard is applicable to the measurement of partial discharges which occur in electrical apparatus, components or systems when tested with alternating voltages up to 400 Hz or with direct voltage. This standard - defines the terms used; - defines the quantities to be measured; - describes test and measuring circuits which may be used; - defines analogue and digital measuring methods required for common applications; - specifies methods for calibration and requirements of instruments used for calibration; - gives guidance on test procedures; - gives some assistance concerning the discrimination of partial discharges from external interference. The provisions of this standard should be used in the drafting of specifications relating to partial discharge measurements for specific power apparatus. It deals with electrical measurements of impulsive (short-duration) partial discharges, but reference is also made to non-electrical methods primarily used for partial discharge location (see annex F). Diagnosis of the behaviour of specific power apparatus can be aided by digital processing of partial discharge data (see annex E) and also by non-electrical methods that are primarily used for partial discharge location (see annex F). This standard is primarily concerned with electrical measurements of partial discharges made during tests with alternating voltage, but specific problems which arise when tests are made with direct voltage are considered in clause 11. The terminology, definitions, basic test circuits and procedures often also apply to tests with other frequencies, but special test procedures and measuring system characteristics, which are not considered in this standard, may be required. Annex A provides normative requirements for performance tests on calibrators.

定价： 189元 / 折扣价： 161 元

This standard defines a protocol enabling precise synchronization of clocks in measurement and control systems implemented with technologies such as network communication, local computing, and distributed objects. The protocol is applicable to systems communicating by local area networks supporting multicast messaging including, but not limited to, Ethernet. The protocol enables heterogeneous systems that include clocks of various inherent precision, resolution, and stability to synchronize to a grandmaster clock. The protocol supports system-wide synchronization accuracy in the sub-microsecond range with minimal network and local clock computing resources. The default behavior of the protocol allows simple systems to be installed and operated without requiring the administrative attention of users. The standard includes mappings to User Datagram Protocol (UDP)/Internet Protocol (IP), DeviceNet, and a layer-2 Ethernet implementation. It includes formal mechanisms for message extensions, higher sampling rates, correction for asymmetry, a clock type to reduce error accumulation in large topologies, and specifications on how to incorporate the resulting additional data into the synchronization protocol. The standard permits synchronization accuracies better than 1 ns. The protocol has features to address applications where redundancy and security are a requirement. The standard defines conformance and management capability. There is provision to support unicast as well as multicast messaging. The standard includes an annex on recommended practices. Annexes defining communication-medium-specific implementation details for additional network implementations are expected to be provided in future versions of this standard.

定价： 469元 / 折扣价： 399 元

The scope of this standard is to provide a recommended practice to provide the architectural framework enabling WPAN devices to promote interoperable, stable, and scaleable wireless mesh topologies and, if needed, to provide the amendment text to the current WPAN standards that is required to implement this recommended practice.

定价： 150元 / 折扣价： 128 元