NI PXIe‑6674T 781037-01 PXI Clock Trigger Routing Multi-Chassis Radar HIL Board

PXIe‑6674T | High Precision OCXO PXI Express Timing & Synchronization Module

Core Hardware Specifications

• Reference Oscillator: OCXO, long-term accuracy 80 ppb, far higher than standard chassis 25 ppm VCXO
• DDS Clock Generator: Output range 0.3 Hz ~ 1 GHz, ultra-fine resolution 2.84 µHz, locked to 800 MHz internal PLL
• Front Panel I/O: 6 SMA bidirectional ports, configurable as 5V LVTTL single-ended or LVDS differential pairs, DC–150 MHz bandwidth
• Backplane Timing Routing: Full access to 8 bidirectional PXI trigger lines + 13 differential PXIe_DStar trigger buses, low-skew PXI star trigger
• Multi-Chassis Sync: Import/export 10 MHz reference clock and all trigger signals via SMA cables to daisy-chain dozens of chassis
• Form Factor: Single 3U PXIe timing slot, compatible with all NI PXIe chassis with ≥38W per-slot cooling capacity

Core Functional Advantages

1. High-stability OCXO upgrades chassis system clock, drastically reducing phase noise and frequency drift critical for radar, 5G wideband RF and modal vibration measurement.
2. Wide-range DDS clock with microhertz resolution generates arbitrary precise sample clocks for digitizers, AWGs and dynamic signal analyzers without external signal generators.
3. Mixed LVTTL/LVDS SMA front panel supports long-distance low-noise timing signal transmission between separated test cabinets.
4. Complete PXI star & DStar trigger routing minimizes inter-module timing skew, enabling sub-nanosecond synchronous sampling across all chassis instruments.
5. Native NI-Sync software stack supports IRIG-B, PPS, GPS clock locking and multi-chassis timing sequencing for distributed large-scale test systems.

Software Compatibility

Typical Applications