The Speed of Software Timed Acquisition With the SCXI-1112 Hardware: SCXI>>Modules>>SCXI-1122
Problem: Why is a software timed acquisition with the SCXI-1112 so slow? Solution: Whenever you start an SCXI-1112 task, the DAQmx Start Task function will take 3 seconds to give the 2 Hz filter on the channel sufficient time to settle. Moreover, if you use the auto-zero function of the SCXI-1112, the DAQmx Start Task function will take an additional 3 seconds to execute. If you are starting the task inside of a loop, you will be taking a least 3 seconds every loop iteration to account for the filter delay at the start of the task. If you want to do a software timed task and avoid this delay, start the task once outside the while loop so the intial filter delay and auto-zero delay are only executed once. You will have an initial delay when you first start your task, but this delay will not occur for every iteration of the loop. Related Links: SCXI-1112 User Manual Attachments:
Report Date: 10/07/2005 Last Updated: 10/17/2005 Document ID: 3Q6FE30K |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
