具有711 nHz分辨率和DC至105 MHz高分辨率時(shí)鐘生成功能PXI國(guó)家儀器公司-6652(零件號(hào):778726-01)是一個(gè)PXI定時(shí)和多底盤同步模塊。該模塊能夠向PXI背板輸入/輸出觸發(fā)信號(hào)，驅(qū)動(dòng)PXI啟動(dòng)觸發(fā)線，并生成TCXO 10 MHz參考時(shí)鐘，降低儀器的穩(wěn)定性。這倪PXI-6652也可用于提高一個(gè)系統(tǒng)內(nèi)的儀器精度，或用于幾個(gè)PXI系統(tǒng)的同步。

當(dāng)此模塊插入PXI機(jī)箱的插槽2時(shí)PXI-6652模塊可以取代PXI機(jī)箱上內(nèi)置的10 MHz參考時(shí)鐘。利用，時(shí)鐘精度提高到1 ppm倪PXI-6652模塊。

的前面板上提供的時(shí)鐘輸入(CLKIN)連接器倪PXI-6652為模塊提供時(shí)鐘。該時(shí)鐘可以通過編程方式路由至片上PLL，用作參考；也可以直接路由至PXI背板(PXI_CLK10_IN)，分配給共享同一機(jī)箱的其它模塊。這定時(shí)和同步模塊配有時(shí)鐘輸出(CLKOUT)連接器。CLKOUT可以通過編程從溫度補(bǔ)償晶體振蕩器(TCXO)、背板時(shí)鐘(PXI_CLK10)、直接數(shù)字頻率合成(DDS)或恒溫晶體振蕩器(OCXO)路由。

這PXI國(guó)家儀器公司-6652具有可編程功能接口(PFI) %3C0..5%的3E。這些連接器中的每一個(gè)都可以用作輸入或輸出。此外，用戶可以將PFI 0配置為其他信號(hào)內(nèi)部同步的時(shí)鐘輸入。利用這種定時(shí)和多機(jī)箱同步模塊，用戶可以根據(jù)個(gè)人能力對(duì)PFI連接進(jìn)行編程。這PXI國(guó)家儀器公司-6652可以利用板載DDS芯片或精密10 MHz振蕩器產(chǎn)生時(shí)鐘信號(hào)。

Featured with 711 nHz resolution and DC to 105 MHz high-resolution clock generation, the National Instruments PXI-6652 (Part Number:  778726-01) is a PXI Timing and Multi-Chassis Synchronization Module. This module comes with the capability to import/export triggers to the PXI backplane, drive PXI start trigger lines, and generate a TCXO 10 MHz reference clock with alleviated stability for instrumentation. The NI PXI-6652 can also be used to enhance the instrument’s accuracy within a system or for the synchronization of several PXI systems together.

When this module is inserted in slot 2 of a PXI chassis, the PXI-6652 module can supersede the built-in 10 MHz reference clock on a PXI chassis. The clock preciseness is increased to 1 ppm with the NI PXI-6652 module.

The Clock Input (CLKIN) connector provided on the front panel of the NI PXI-6652 supplies the module with a clock. This clock can be routed to the onboard PLL programmatically for its utilization as a reference or routed to the PXI backplane (PXI_CLK10_IN) directly for distribution to other modules sharing the same chassis. This Timing and Synchronization Module comes equipped with a Clock Output (CLKOUT) connector. The CLKOUT can be routed programmatically from the temperature-compensated crystal oscillator (TCXO), backplane clock (PXI_CLK10), direct digital synthesis (DDS), or oven-controlled crystal oscillator (OCXO).

The National Instruments PXI-6652 features Programmable Function Interfaces (PFI) <0..5>. Each of these connectors can be used as an input or output. In addition, the user can configure the PFI 0 as a clock input for the internal synchronization of other signals. With this timing and multi-chassis synchronization module, the user can program PFI connections in their individual capacity. The National Instruments PXI-6652 can generate clock signals using either its onboard DDS chip or a precise 10 MHz oscillator.