A4H124-24TX ENTERASYS CPU模块

 A4H124-24TX  ENTERASYS CPU模块

A4 在 10/100 可堆叠交换机中包含企业级功能，可确保无缝连接和应用程序性能。A4 支持 16,000 个 MAC 地址，是需要支持数千个端点的大中型企业的选择。强大的服务质量 (QoS) 功能可为集成多媒体网络提供强大支持，包括 IP 语音 (VoIP) 和 IP 视频，以及所有类型的数据密集型应用程序。与其无阻塞 L2 交换架构相结合，A4 的智能排队机制可确保关键任务应用程序获得对网络资源的优先访问。A4 包括一个 24 端口型号，采用非常安静的设计，可在典型的办公环境中无风扇运行，是教室和会议室的理想选择。高度可扩展的架构和终身保修确保 A4 网络投资将在未来维持一个安全、功能丰富且具有成本效益的网络。支持扩展，对各网络节点支持独立的 VLAN与 LAN通道功能。支持设备接入，如交换机、网卡和交换机的任意端口。支持端口支持策略配置、 VLAN配置、网卡配置等功能。

 A4H124-24TX  ENTERASYS CPU模块

A4 includes enterprise-class features in a 10/100 stackable switch to ensure seamless connectivity and application performance. A4 supports 16,000 MAC addresses and is the choice of large and medium-sized enterprises that need to support thousands of endpoints. Powerful quality of service (QoS) functions can provide strong support for integrated multimedia networks, including voice over IP (VoIP) and IP video, as well as all types of data-intensive applications. Combined with its non-blocking L2 switching architecture, A4' s intelligent queuing mechanism can ensure that mission-critical applications get priority access to network resources. A4 includes a 24-port model with a very quiet design, which can run in a typical office environment without a fan, making it an ideal choice for classrooms and conference rooms. Highly scalable architecture and lifetime warranty ensure that A4 network investment will maintain a safe, functional and cost-effective network in the future. Support expansion, and support independent VLAN and LAN channel functions for each network node. Support device access, such as switches, network cards and any port of switches. Support ports support policy configuration, VLAN configuration, network card configuration and other functions.

所谓涡流探伤是基于电磁感应原理，当把通有交变电流的线圈（激磁线圈）靠近导电物体时，线圈产生的交变磁场会在导电体中感应出涡电流，该涡电流的分布及大小除了与激磁条件有关外，还与导电体本身的电导率、磁导率、导电体的形状与尺寸、导电体与激磁线圈间的距离、导电体表面或近表面缺陷的存在或组织变化等都有密切关系。涡电流本身也要产生交变磁场，通过检测其交变磁场的变化，可以达到对导电体检测的目的。因此，利用涡流探伤技术，可以检测导电物体上的表面和近表面缺陷、涂镀层厚度、热处理质量（如淬火透入深度、硬化层厚度、硬度等）以及材料牌号分选等等。

　　退磁的方法很多:1.将钢材加热到居里温度以上(铁的居里温度为摄氏769度),当然此温度状态下,材料受到热处理,材料的性能会发生改变.2.可以将材料置于交流线圈前,使其缓慢通过交流线圈,直至离开线圈1米以外,对于重型或大型工件,也可以将交流线圈套在工件上,通电时将线圈缓慢通过并远离工件,在距工件1米以外段电.3.直流换向衰减法或频电流自动退磁,也是可以选用的方法. 

A4H124-24TX  ENTERASYS CPU模块

The so-called eddy current flaw detection is based on the principle of electromagnetic induction. When the coil (exciting coil) with alternating current is close to a conductive object, the alternating magnetic field generated by the coil will induce eddy current in the conductor. The distribution and size of the eddy current are closely related to the electrical conductivity and permeability of the conductor itself, the shape and size of the conductor, the distance between the conductor and the exciting coil, and the existence or structural changes of defects on or near the surface of the conductor. The eddy current itself also produces an alternating magnetic field, and the purpose of detecting the conductor can be achieved by detecting the change of its alternating magnetic field. Therefore, eddy current flaw detection technology can be used to detect surface and near-surface defects on conductive objects, coating thickness, heat treatment quality (such as quenching penetration depth, hardened layer thickness, hardness, etc.), material grade sorting and so on.

There are many ways to demagnetize: 1. Heat the steel above the Curie temperature (the Curie temperature of iron is 769 degrees Celsius). Of course, at this temperature, the material will be subjected to heat treatment, and the properties of the material will change. 2. You can put the material in front of the AC coil and make it slowly pass through the AC coil until it is 1 meter away from the coil. For heavy or large workpieces, you can also wrap the AC coil around the workpiece, and slowly pass the coil away from the workpiece when it is energized.