We have a problem concerning the time of the system.
Our system is;
(1)measuring the signals of production line through the LabJack U3-HV.
(2)processing the data on a PC by a ctl file, which runs on the DAQFactory Express.
(3)the ctl file is always kept on, as well as the PC
The problem we have is that the time of the "Graph", one of the Components of the DAQFactory Express,differs more and more greatly from the PC time as time passes.
(see the attached pictures;20131006.jpg,20131105-1.jpg)
It seems that the time difference increases proportionally to the working time of the file.
(see the attached pictures;Difference.jpg)
The PC time is almost equal to the actual time.
So my questions are;
(1)Does the system consisting of LabJack U3-HV and the DAQFactory Express have a different clockother than the PC clock?
(2)If so, is there any way to cancel the difference?
Concerning (2), we closed the ctl file and re-opened it by chance, and found out that the time difference was canceled, which may suggests one of the solution.
(see the attached pictures;20131105-1.jpg, and 20131105-2.jpg)
Thanks in advance.