GPS, IEEE 1588, and IRIG-B Timing and Synchronization Modules for PXI and PXI Express NI PXI-6682, NI PXI-6682H ◾◾ Synchronize PXI and PXI Express systems using GPS, IEEE 1588-2008, IRIG-B, or PPS ◾◾ Available for PXI systems, PXI-6682, and for PXI Express systems, PXI-6682H ◾◾ Onboard routing of internal and external clock and trigger signals ◾◾ Can be used as PXI slot 2 star trigger controller (not available on PXI-6682H) ◾◾ Onboard high-stability 10 MHz reference (1 ppm) Operating Systems ◾◾ Windows 7/Vista/XP Recommended Software ◾◾ LabVIEW ◾◾ LabWindows™/CVI Driver Software (included) ◾◾ NI-Sync PXI System Configuration ◾◾ Complete PXI system configuration at ni.com/pxiadvisor >>For complete specifications and compliance information, see appendix A in the NI PXI-6682 user manual at ni.com/manuals. Overview The NI PXI-6682 and PXI-6682H timing and synchronization modules synchronize or between multiple chassis, providing a method for synchronizing multiple PXI and PXI Express systems using GPS, IEEE 1588, IRIG-B, or PPS to perform devices in a PXI system. Because of this, you can greatly improve the accuracy synchronized events. You can use them to generate events and clock signals of measurements, implement advanced triggering schemes, or synchronize at specified synchronized future times and timestamp input events with the multiple devices and/or multiple chassis to act as a single system for high- synchronized system time. When installed in slot 2 of a PXI chassis, the channel-count applications. Table 1 compares the features of different NI timing NI PXI-6682 routes clock signals and triggers with low skew within a PXI chassis and synchronization product offerings. Features NI PXI-6651 NI PXI-6652 NI PXI-6653 NI PXIe-6672 NI PXI-6682/H CLK in 3 3 3 3 32 CLK out – 3 3 3 3 2 SMB 6 SMB 6 SMB 6 SMB 3 SMB – – – – 3 GPS – – – – 3 IEEE 1588 – – – – 3 IRIG-B – – – – 3 3 3 3 3 Star trigger source (PXI_STAR) 3 3 3 3 32 PXI trigger bus (PXI_TRIG) 3 3 3 3 3 Front Panel Connectivity General-purpose PFI lines GPS, IEEE 1588, IRIG-B Time References Programmable Voltage Threshold Trigger Routing Onboard Clock Sources 10 MHz timebase – TCXO (1 ppm) OCXO (50 ppb) TCXO (1 ppm) TCXO (1 ppm) Programmable clock1 – DC to 105 MHz (DDS) DC to 105 MHz (DDS) DC to 105 MHz (DDS) DC to 1.5 MHz Frequency resolution of <0.075 Hz for NI PXI-6652, PXI-6653, and PXIe-6672. For NI PXI-6682, the clock period and duty cycle have to be a multiple of 10 ns. Not available on the hybrid-compatible version of the module, the PXI-6682H. 1 2 Table 1. Features Comparison for Various NI Timing and Synchronization Modules Including the PXI-6682 and PXI-6682H GPS, IEEE 1588, and IRIG-B Timing and Synchronization Modules for PXI and PXI Express Synchronize PXI and PXI Express Systems Using GPS, IEEE 1588, or IRIG-B With the PXI-6682 and PXI-6682H, you can use GPS, IEEE 1588, IRIG-B, or PPS signals as the time reference to synchronize with other devices or PXI and PXI Express systems. You have not only a synchronized clock for multiple PXI and PXI Express systems but also a common time reference. Because of this, you can generate synchronized future time events and timestamp incoming signals with the synchronized time. The GPS receiver on the PXI-6682 and PXI-6682H can power an active GPS antenna and receive and process the RF signals (1.575 GHz) from satellites. It generates a very precise pulse-per-second (PPS) signal that the PXI-6682 and PXI-6682H use to achieve submicrosecond synchronization. Because of this, from those locations. Furthermore, once the PXI-6682 and PXI-6682H are synchronized to GPS, they can function as IEEE 1588 grandmasters to achieve synchronization of external 1588 devices. NI-Sync 3.1 or later supports Note: The PXI-6682H does not have PXI_STAR trigger lines, shown as PXI_STAR<0..12> in Figure 2. The PXI-6682H does not have the CLKIN circuitry or the ability to drive PXI_CLK10_IN. Star Trigger Bus IEEE 1588-2008. NI-Sync 3.0 is available on the Web for those who need 10 MHz Clock of the PXI backplane (Figure 3). To act as a PXI star trigger controller or to offer Module The PXI-6682 provides full control of the timing and synchronization features Star Trigger Controller PXI-6682 as a Star Trigger Controller System Controller IEEE 1588-2002 support. Local Bus Module and PXI Express systems as long as GPS satellites are visible to the antenna Figure 2. Functional Overview of the PXI-6682 Module you can use the PXI-6682 and PXI-6682H to synchronize spatially located PXI a high-accuracy, free-running 10 MHz reference clock, the PXI-6682 must be installed in slot 2 of the PXI chassis, as shown in Figure 1. It is capable of routing 132 MB/s, 33 MHz, 32-Bit PCI Bus signals to and from the front panel, the PXI star triggers, and the PXI triggers. In addition, you can invert the polarity of the destination signal, which is useful PXI Trigger Bus when handling active-low digital signals. The PXI-6682 can also route a 10 MHz clock from CLKIN to the PXI 10 MHz reference clock and route the TCXO or PXI 10 MHz reference clock to CLKOUT. Refer to Figure 2 for the PXI-6682 functional block diagram. Figure 3. Diagram of Synchronization Features in the PXI Backplane Synchronizing PXI Express Systems with the PXI-6682H You can use the PXI-6682H in any PXI hybrid-compatible slot in PXI Express chassis with PXI hybrid slots. By using the PXI-6682H in such a system, you can timestamp events and create future time events on the PXI_TRIG lines as well as reference your system time to GPS, IEEE 1588, or IRIG-B. The PXI-6682H is essentially the same module as the PXI-6682 except NI has removed one connector so the PXI-6682H can plug into PXI Express systems. For this reason, you cannot drive PXI_CLK10, the PXI_STAR trigger lines, or any of the PXI Express clocks and triggers. If you wish to override CLK_10 in a PXI Express Figure 1. The PXI-6682 is connected to an active GPS antenna and installed in a system timing slot (slot 2) of an NI PXI-1042 chassis. system, you can route a coaxial cable from CLKOUT on the PXI-6682H to the 10 MHz clock input on the rear of the PXI Express chassis (if the chassis you have selected has this input). To drive the PXI_STAR trigger lines, you must also incorporate a PXI Express timing module such as the NI PXIe-6672. BUY ONLINE at ni.com or C ALL 800 813 36 93 (U.S.) 2 GPS, IEEE 1588, and IRIG-B Timing and Synchronization Modules for PXI and PXI Express Synchronization Accuracy NI-Sync Software Table 2 lists the synchronization accuracy that the PXI-6682 and PXI-6682H offer The included NI-Sync driver software provides powerful yet easy-to-use control while operating in various modes. of PXI-6682 and PXI-6682H modules. You can use NI application development Mode1 Synchronization Accuracy GPS2 ±100 ns, <13 ns std deviation IEEE 1588 3 m Ethernet direct connection3 ±47 ns, <10 ns std deviation IEEE 1588 via hub3,4 ±210 ns, <35 ns std deviation IEEE 1588 via switch3,5 ±25 µs, <150 ns std deviation IRIG-B DC ±55 ns, <13 ns std deviation IRIG-B AM matching ±1 µs, <220 ns std deviation IRIG-B AM to source7 ±5 µs, <500 ns std deviation PPS ±47 ns, <10 ns std deviation 6,7 All synchronization measurements were done by recording the offset between PPS signals generated by two PXI-6682 modules inside a closed NI PXI-1031 chassis at ambient room temperature conditions. Synchronization was performed for 15 minutes before testing began. All test durations were 12 hours. 2 For the GPS test, two PXI-6682 modules were independently synchronized to GPS and configured to generate a PPS signal. The specification above represents empirical results. Please note that GPS satellites are guaranteed to be within only 100 ns of UTC. Therefore, the offset between any two synchronized devices can be as high as 200 ns plus the offset of that device to GPS. 3 Sync interval of 1 second was used for IEEE 1588 tests, and all Ethernet connections were 100 Mb/s. 4 Netgear DS104 hub used. 5 Airlink101 gigabit over copper switch used. For this test, a moderate amount of non-1588 Ethernet traffic was present on the switch. 6 IRIG-B AM matching specification was obtained by setting two PXI-6682 modules to synchronize independently to the same IRIG-B AM source and generate a PPS signal. The offset between their PPS signals was then measured over a 12-hour period. 7 IRIG-B performance depends on IRIG-B source stability and quality. 1 environment (ADE) software such as LabVIEW or LabWindows/CVI, or other ADEs such as Visual C/C++, for programming the PXI-6682 and PXI-6682H. For NI-Sync example programs, visit ni.com/examples. >>For complete specifications and compliance information, see appendix A in the NI PXI-6682 user manual at ni.com/manuals. Ordering Information NI PXI-6682 (GPS, IEEE 1588, IRIG-B).............................................779929-01 NI PXI-6682H (GPS, IEEE 1588, IRIG-B)...........................................781059-01 GPS antenna with 30 m coaxial cable............................................196304-30 SMB 200 SMB plug to SMB plug coax, 50 W, 1 m...............................188859-01 SMB 210 Dual SMB plug to dual SMB plug coax, 50 W, 1 m...............188858-01 BUY NOW For complete product specifications, pricing, and accessory information, call 800 813 3693 (U.S.) or go to ni.com/pxi. Table 2. NI PXI-6682 and PXI-6682H Synchronization Accuracy High-Stability 10 MHz Timebase When configured as a star trigger controller, the PXI-6682 can override the built-in 10 MHz reference clock on a PXI chassis. Most PXI chassis provide a 10 MHz reference clock with 25 ppm accuracy (10 MHz ±250 Hz). This accuracy is improved to 1 ppm with the PXI-6682. Many modules, such as NI PXI-5xxx modular instruments, have phase-locked loop (PLL) circuitry to synchronize with the 10 MHz reference clock. BUY ONLINE at ni.com or C ALL 800 813 36 93 (U.S.) 3 NI Services and Support your needs around the globe and through PL AN MA IN NI has the services and support to meet IN TA the application life cycle – from planning and development through deployment and SERVICE NEEDS ongoing maintenance. We offer services P DE EL OP and service levels to meet customer LO Y requirements in research, design, validation, V DE and manufacturing. Visit ni.com/services. Local Sales and Technical Support In offices worldwide, our staff is local to the country, giving you access to engineers who speak your language. 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