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
while operating in various modes.
The included NI-Sync driver software provides powerful yet easy-to-use control
of PXI-6682 and PXI-6682H modules. You can use NI application development
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.
Mode1
Synchronization Accuracy
±100 ns, <13 ns std deviation
±±7 ns, <10 ns std deviation
±210 ns, <35 ns std deviation
±25 ꢀs, <150 ns std deviation
±55 ns, <13 ns std deviation
±1 ꢀs, <220 ns std deviation
±5 ꢀs, <500 ns std deviation
±±7 ns, <10 ns std deviation
GPS2
IEEE 1588 3 m Ethernet direct connection3
IEEE 1588 via hub3,±
IEEE 1588 via switch3,5
IRIG-B DC
>>For complete specifications and compliance information, see
appendix A in the NI PXI-6682 user manual at ni.com/manuals.
IRIG-B AM matching6,7
IRIG-B AM to source7
PPS
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...........................................19630±-30
SMB 200
1All 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.
2For 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.
3Sync interval of 1 second was used for IEEE 1588 tests, and all Ethernet connections were 100 Mb/s.
±Netgear DS10± hub used.
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
5Airlink101 gigabit over copper switch used. For this test, a moderate amount of non-1588 Ethernet
traffic was present on the switch.
6IRIG-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.
BUY NOW
For complete product specifications, pricing, and accessory information,
7IRIG-B performance depends on IRIG-B source stability and quality.
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 CALL 800 813 3693 (U.S.)
3
NI [ National Instruments ]
