PXI-6608 Not Recognizing IRIG-B Signals For GPS Time Hardware: Counter/Timers (TIO)>>Devices>>PXI-6608
Problem: I am using the example program that ships with LabVIEW, called "GPS - Time N Software Events (NI-TIO).vi". I connect my GPS receiver to the PXI-6608 so that the board will synchronize with GPS time, but the time displayed in the VI's front panel is not synchronized correctly. What is the problem? Solution: There are many different standards of IRIG-B signals. Make sure that your IRIG-B signal is of the "DC Level" type. You can confirm this by looking at the signal on an oscilloscope. It should be TTL level with a period of about 10 mSec. Some IRIG-B signals are modulated on 1 kHz sine wave carriers, which are not compatible with the PXI-6608. The NI 6608 provides a real-time clock that you can synchronize with a Global Positioning System (GPS) that provides IRIG-B (TTL standards B000, B001, B002, and B003 only) or a pulse per second (PPS) signal. Attach the synchronization signal to the synchronization line of the real-time clock. Please see the link below for more information on using the PXI-6608 with a GPS receiver. Related Links: NI Developer Zone: Synchronizing and Correlating Measurements to a Global Timebase with GPS KnowledgeBase 27599UYF: GPS-Based Synchronization on the NI 6608 Attachments:
Report Date: 12/16/2004 Last Updated: 05/13/2006 Document ID: 3GF8NQW1 |
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