BENTLY 3500/15电源模块，3500/15使用进展
冷却要求摩托罗拉VMEmodules的指定、设计和测试在进风温度范围为0的情况下可靠运行摄氏度至55摄氏度（32华氏度至131华氏度）强制空气冷却。温度鉴定在标准摩托罗拉VMEsystem-1000机箱。25瓦加载板插入两个卡槽中，每侧一个，靠近测试板，以模拟高功率密度系统配置。三个轴流风机的组件，额定功率为100每个风扇的CFM直接放置在MVME卡固定框架下。
BENTLY 3500/15电源模块这个在风扇组件之间测量进气温度和卡笼，其中进入的气流首先遇到正在测试的模块。测试软件在模块运行时执行受到环境温度变化的影响。外壳温度对关键的高功率密度集成电路进行监控确保不超过组件供应商的规格。而冷却所需的确切风量取决于环境空气温度以及板和其他热源，通常可以充分冷却通过模块上的10 CFM实现。空气流量较小需要在温度较低的环境中冷却模块最大环境。在更有利的热条件下可以在高于55%的温度下可靠地操作模块摄氏度，空气流量增加。值得注意的是除了空气动力装置的额定CFM外，还有几个因素，这决定了流过模块的实际空气体积。通讯委员会规章MVME147在符合FCC的底盘上进行了测试，符合A类设备的要求。FCC合规性在以下条件下实现：所有外部输入/输出端口上的屏蔽电缆。2、通过金属外壳连接至接地的电缆屏蔽连接至导电模块前面板的连接器。
Cooling Requirements Motorola VMEmodules are specified, designed, and tested to operate reliably with an incoming air temperature range from 0 degrees C to 55 degrees C (32 degrees F to 131 degrees F) with forced air cooling. Temperature qualification is performed in a standard Motorola VMEsystem- 1000 chassis. Twenty-five watt load boards are inserted in the two card slots, one on each side, adjacent to the board under test to simulate a high power density system configuration. An assembly of three axial fans, rated at 100 CFM per fan, is placed directly under the MVME card cage. The incoming air temperature is measured between the fan assembly and the card cage where the incoming airstream first encounters the module under test. Test software is executed as the module is subjected to ambient temperature variations. Case temperatures of critical, high power density integrated circuits are monitored to ensure component vendors specifications are not exceeded. While the exact amount of airflow required for cooling depends on the ambient air temperature and the type, number, and location of boards and other heat sources, adequate cooling can usually be achieved with 10 CFM flowing over the module. Less air flow is required to cool the module in environments having lower maximum ambients. Under more favorable thermal conditions it may be possible to operate the module reliably at higher than 55 degrees C with increased air flow. It is important to note that there are several factors, in addition to the rated CFM of the air mover, which determine the actual volume of air flowing over a module. FCC Compliance The MVME147 was tested in an FCC-compliant chassis, and meets the requirements for Class A equipment. FCC compliance was achieved under the following conditions: 1. Shielded cables on all external I/O ports. 2. Cable shields connected to earth ground via metal shell connectors bonded to a conductive module front panel.
