PXI-4462
机箱的主要功能经过设计和验证，可满足或超过对功率要求高的PXI模块的冷却要求。PXI Express电源规格要求每个外围插槽的可用功率至少为30 W，并且每个插槽可以散发相同的热量。NI设计的PXI Express机箱超过了PXI Express的要求，为每个外围插槽提供了至少38.25 W的电源和冷却；一些机箱进一步提高了插槽的冷却能力，可以为单个插槽提供58 W或82 W的冷却。这种额外的电源和冷却使高性能模块（如数字化仪、高速数字输入/输出和射频模块）的功能在可能需要连续采集或高速测试的应用中成为可能。机箱的总系统功率各不相同，因此在配置新系统时，始终建议执行系统级功率预算。10BAll混合插槽选项您可以在PXIe-1084机箱中插入PXI Express和混合兼容PXI模块，因为所有17个外围插槽都是混合插槽，以实现大的仪器放置灵活性。如表1所示，所有NI PXI Express机箱都至少有几个混合插槽，但其中一些插槽针对此用例进行了优化。图1：。PXIe-1084具有17个混合外围插槽。1BAcoustics即使具有先进的冷却能力，NI PXI底盘的设计也可将整个系统的声发射降至低，这对于台式验证环境尤为重要。PXIe-1084、PXIe-1092和PXIe-1095在其典型的38 W冷却模式中是NI安静的机箱，声压级仅为34-38 dBA，比其他供应商的大型机箱低2倍多。将风扇速度控制、使用的风扇类型和风扇安装方法相结合，可以实现冷却优化，同时将发出的噪音降至低。NI在其许多PXI机箱中采用脉宽调制（PWM）风扇，以比传统电压控制风扇进一步减少声发射。风扇的PWM信号控制允许NI机箱设计者使用更大范围的风扇RPM设置，从而可以微调机箱的声发射和冷却性能。

Key Features 9BCooling NI chassis are designed and validated to meet or exceed the cooling requirements for the most powerdemanding PXI modules. The PXI Express power specification requires a minimum of 30 W of power be available to each peripheral slot and that each slot can dissipate that same amount of heat. PXI Express Chassis designed by NI exceed PXI Express requirements by providing at least 38.25 W of power and cooling to every peripheral slot; some chassis push slot cooling capacity even further and can provide 58 W or 82 W of cooling to a single slot. This extra power and cooling makes advanced capabilities of high-performance modules, such as digitizers, high-speed digital I/O, and RF modules, possible in applications that may require continuous acquisition or high-speed testing. Chassis vary in total system power, so it is always recommended to perform a system-level power budget when configuring a new system. 10BAll-Hybrid Slot Options You can insert both PXI Express and hybrid-compatible PXI modules in the PXIe-1084 chassis because all 17 peripheral slots are hybrid slots for maximum instrument placement flexibility. As seen in Table 1, all NI PXI Express chassis feature at least a few hybrid slots, but some are more optimized for this use case than others. Figure 1. The PXIe-1084 features 17 hybrid peripheral slots. 1BAcoustics Even with their advanced cooling capabilities, NI PXI chassis are designed to minimize the overall system acoustic emissions, which is particularly important for benchtop validation environments. The PXIe-1084, PXIe-1092, and PXIe-1095 are NI’s quietest chassis in their typical 38 W cooling profiles, with sound pressure levels in the range of only 34-38 dBA, more than 2x quieter than other vendors’ large chassis. Combining fan speed control, the type of fan used, and fan mounting method makes cooling optimization possible while minimizing the acoustic noise emitted. NI implements pulse-width modulated (PWM) fans in many of its PXI chassis to reduce acoustic emissions further than that of traditional voltage-controlled fans. PWM signal control of the fan permits the NI chassis designer to use a wider range of the fan’s RPM settings, thus making it possible to fine tune the chassis’ acoustic emissions and cooling performance.