Reaching the Specified "Fast" Sample Rates on the NI 435xHardware: Modular Instruments>>High-Precision DAQ (Dataloggers)
Problem: How does the NI 435x reach the "fast" reading (sample) rate given in the specifications document? Solution: The specification for single-channel measurements is 60 samples/s. If you perform the acquisition for a very short amount of time (less than 1 second), you may observe that the reading rate is not 60 S/s. Initially, a sequence of register writes to the NI 435x in order to initialize the device. This initialization must take place, regardless of how many points you are going to measure. Also, an initial hardware settling delay occurs after the hardware has been programmed by the software. Over a typical acquisition, this time is amortized over a larger number of points and the reading rate will match the specification. Related Links: Attachments:
Report Date: 03/21/2003 Last Updated: 06/11/2004 Document ID: 2VKFJA2O |
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