How Can I Acquire Pretrigger Samples with NI-SCOPE?Primary Software: Driver Software>>NI-SCOPEPrimary Software Version: 3.0 Primary Software Fixed Version: N/A Secondary Software: N/A
Problem: I am using the NI-SCOPE driver and I would like to acquire pretrigger samples, how can this be done? Solution: With NI-SCOPE, you can specify how many pretrigger samples you want to acquire using the reference position input of the ni_Scope Configure Horizontal Timing VI in LabVIEW, or the refPosition input of the ni_ScopeConfigureHorizontalTiming function in a text-based programming language. The reference position (refPosition) input specifies the position of the Reference Event in the waveform record as a percentage of the record. This percentage can range from 0-100%, and will represent the number of pretrigger versus posttrigger points that are stored. For example, a 0% reference position means that you will have the actual record length points stored after the trigger occurs, while the 100% reference position means that all the samples are stored before the trigger occurs. Likewise, a 50% reference position means that half of the record will be pretrigger samples and half will be posttrigger samples. Related Links: Products and Services: NI-SCOPE Attachments:
Report Date: 03/27/2007 Last Updated: 12/05/2008 Document ID: 47QC624G |
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