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Global Positioning System (GPS) Timestamp from the PXI-6608 Shows a 90ms Delay

Primary Software: Driver Software>>NI-DAQmx
Primary Software Version: 8.0
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: Counter/Timers (TIO)>>Devices>>PXI-6608

Problem:
Why are my GPS timestamps from the PXI-6608 delayed by 90ms?

Solution:
The PXI-6608 provides a real-time clock which you can synchronize with a Global Positioning System (GPS) receiver that provides an IRIG-B (TTL standards B000, B001, B002, and B003 only) or a pulse per second (PPS) signal.

There is a known issue with the calibration constant for the GPS timestamp in NI-DAQmx Driver Version 8.0. To return the accurate GPS timestamp, subtract 90 ms from the value measured by the PXI-6608.

Related Links:
Developer Zone Tutorial: Synchronizing and Correlating Measurements to a Global Timebase with GPS
KnowledgeBase 27599UYF: GPS-Based Synchronization on the NI 6608
KnowledgeBase 3OU74CS9: How Do I Configure My 6608 Real-Time Clock for GPS Timing Synchronization?
Products and Services: NI PXI-6608

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Report Date: 01/31/2006
Last Updated: 01/10/2008
Document ID: 3TUGTUX6

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