Pressure signal from DAQ keeps changing daily.

[tnek]

Hi Xiao-ting,

To synchronize the tasks, you can share the sample clock ffrom your analog input task. Here is a screenshot of how you can set it up inside the counter task. In addition you can find good resources in the LabVIEW SignalExpress Help and in this article.



Regards,
Kent
Applications Engineer


Message Edited by tnek on 04-24-2008 01:37 PM

[Xiaoting]

Hi Kent

Thank you so much for your reply. I need program a clock source by programming in Labview, is it right? What I want to find out is that whether there is a way to make a clock source by just using our Labview Signal (Limited Edition) in order to cut off our cost.

Thank you and look forward to your reply.

Kind regards,

Xiao-ting

[tnek]

Hi Xiao-ting,

The sample clock is available in LabVIEW SignalExpress Limited Edition. By default the sample clock is set by dividing down the internal timebase. You can then access this sample clock through internal routing. You can find out more about the internal routes here.

Regards,
Kent
Applications Engineer

[Xiaoting]

Hi Kent

Thank you for that. Please find the attached screenshots of our available internal routes.

Our pressure transducer is connected to Ai1 and Ai9. Displacement sensors are connected to PFi0 and PFi1.

Does that mean that we don't have that routes for default sample clock? It is quite confusing to me.

Thanks and look forward to your reply.

Kind regards,

Xiao-ting

[tnek]

Hi Xiao-ting,

You are correct, you will not be able to share your sample clock. I cannot really think of another way to synchronize the analog input and the hardware timed counter input in LabVIEW SignalExpress. If you had an external sample clock, you could use that (it can be from LabVIEW or any other TTL signal which you can export). You should be able to do software timed acquisitions in parallel which may work for what you are trying to do. However, to get more functionality, you may have to either upgrade your DAQ card or use LabVIEW.

Regards,
Kent
Applications Engineer