NI PXI-6682 Timing and Synchronization Module

The NI PXI-6682 is a timing and synchronization module for PXI and PXI Express systems that delivers precision synchronization via GPS, IEEE 1588, IRIG-B, or PPS signals. It generates future time events and timestamps input signals using synchronized system time, while routing clock signals and triggers with low skew within and across multiple chassis. An onboard TCXO disciplined by external synchronization sources ensures long-term stability and 1 ppm timebase accuracy. The module occupies one 3U PXI slot and functions as a star trigger controller or high-accuracy 10 MHz reference clock, making it essential for distributed systems and complex test environments requiring sub-nanosecond timing coherence.

– Technical Specifications

• Synchronization Sources: GPS, IEEE 1588, IRIG-B, PPS (Pulse Per Second)
• Timebase Accuracy: 1 ppm (10 MHz timebase)
• Onboard TCXO: Temperature-compensated crystal oscillator, disciplinable by GPS, IEEE 1588, or IRIG-B
• Programmable Clock Output: DC to 1.5 MHz
• Clock Period and Duty Cycle: Multiples of 10 ns resolution
• Timestamping Minimum Pulse Width: 36 ns
• Chassis Integration: One 3U PXI slot; recommended placement in slot 2 for star trigger control or 10 MHz reference distribution
• PXI-6682H Variant: Hybrid-slot compatible for PXI Express; lacks PXI_CLK10, PXI_STAR trigger, and PXI Express clock/trigger drive capability

– Key Features

• Future time event generation at precisely synchronized intervals
• Input event timestamping with synchronized system time
• Internal and external clock/trigger routing with low skew across distributed chassis
• GPS antenna connector with 5 VDC active antenna power
• Ethernet (RJ-45) and SMB connectors for signal I/O
• LED status indicators for GPS, IEEE 1588, Ethernet link, and speed

– Typical Applications

• Multi-chassis test systems requiring coherent timing
• Distributed measurement synchronization across geographically separated sites
• High-precision event logging and trigger generation
• GPS-disciplined reference clock distribution

– Compatibility & Integration

Supported by NI-Sync driver software. Compatible with LabVIEW, LabWindows/CVI, and Visual C/C++ development environments. Module weight: 235 g.