GPS Self Survey Does Not Complete with PXI-6682Hardware: PXI/CompactPCI>>Platform Modules>>PXI-6682
Problem: I have a PXI-6682 installed in slot two of my PXI chassis. When the test panel for the 6682 is opened in Measurement & Automation Explorer(MAX), the self survey meter never reaches 100%. Did I install my card wrong, or is there something else that I need to do to ensure that the card is using the GPS timebase and that it is getting a signal from the satellites? Solution: When you initially connect the GPS antenna to the NI PXI-6682, the onboard GPS receiver searches for visible satellites. After detecting at least four satellites, the GPS receiver performs a self survey. During a self survey, GPS can be used as a Time Reference, but is less accurate than after the self survey has completed. The self survey is a process of performing measurements of the visible satellites once per second and averaging those measurements so that the current position can be determined as accurately as possible. Once the accurate position is determined, time data received from the GPS satellites can be precisely applied. A self survey is applied only if the NI PXI-6682 is not configured for mobile mode. Use mobile mode if the antenna is moving while the device has power. If the antenna is moving and mobile mode is not enabled, you may get unexpected and invalid timing results. However, using mobile mode degrades onboard GPS receiver accuracy, and you should not use it unless the antenna is moving. For most accurate results, disable mobile mode and maintain the antenna in a fixed position Related Links: Product Manuals: NI PXI-6682 User Manual and Specifications Product Manuals: NI PXI-6682 Installation Guide Attachments:
Report Date: 09/19/2008 Last Updated: 09/19/2008 Document ID: 4PI8PNS0 |
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