Error -1074115830 when Using External Reference Clock with High-Speed Digitizers (Scopes)Primary Software: Driver Software>>NI-SCOPEPrimary Software Version: 3.0 Primary Software Fixed Version: N/A Secondary Software: N/A Hardware: Modular Instruments>>High-Speed Digitizers (Scopes)
Problem: I am trying to PLL to an external reference clock with my NI High-Speed Digitizer (Scope) card. I have configured my reference clock for an external input using the niScope Configure Clock VI in LabVIEW, yet when I run the program, I receive the following error: Error -1074115830 occurred at: niScope Initiate Acquisition.vi.
 The specifications for my card state that the PLL reference clock must have a frequency of 1 MHz to 20 MHz in 1 MHz increments, with an accuracy to ±50 ppm. My clock source fits all those requirements, but it is at a rate that is not 10 MHz. What step(s) am I missing? Solution: When using an external reference clock at a frequency besides the 10 MHz default expected value, you must explicitly specify the reference clock rate as well. Instead of using the niScope Configure Clock VI, try using the niScope Property Node to access the Reference Clock Source and Reference Clock Rate properties (see screenshot; these properties are found under the Clocking submenu). First, specify the source (VAL_CLK_IN for external input; check context help for other source values), then specify the expected reference clock rate (in Hz). You should then be able to PLL to an external reference clock with a rate other than 10 MHz.  Related Links: Product Manuals: NI High-Speed Digitizers Help KnowledgeBase 3ON9JAOY: Is There a Minimum Sample Rate for NI High-Speed Digitizers? Attachments:
Report Date: 09/26/2006 Last Updated: 06/05/2009 Document ID: 41P9C1JQ |
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