Timing

[Alloush]

Hello,
I am developing a VI for finite data aquisition, I would like to add a timing option to my VI. In my program I click start to start aquisition and end to end it etc... as can be seen from my front panel. I would also like to have the option to specify a specific amount of runtime, and click run and let it countdown from the specefied time. I am not sure of the best way to do it, I am using a simple state machine, so shall i add timing in the initialize case or the run case? Attached are snapshots and the VI itself.

Thank you
Labview Newbie

Message Edited by Alloush on 08-17-2006 06:38 AM

[Alloush]

here is my VI

[TiTou]

Use the "Elapsed Time" function or make your own by substraction the loop actual duration to the amout of time you set.

Or you can also compute the number of sample to acquire from the acquisition rate and the duration and use different DAQmx settings.

I ll try to find time latter today to modify your VI

[Alloush]

Hi Titou I am trying to use the elapsed time function, by setting a start time and a time target, but it does not seem to have an affect. You mentioned three alternatives, how do I choose which one to use? and which onewould be the most effective?

Thank you
Alloush

[TiTou]

I assume the mopst effective and probably the easiest would be to set the DAQmx task according to what you want. I am not an expert in DAQmx, far from  !
But I know for sure that there are loads of examples for if you want to set a continuous acquisition or a certain number of point to acquire and so on. So I suggest you look through the examples and try to learn about the different way to set up a DAQmx task ;).
I know this is a lot of work... good luck !

Hopefully somebody here will be able to tell you more on DAQmx in other section of the forum 😉

[Alloush]

HI Totou,

How about this way ?, can I change the control from reading in in milliseconds to seconds.


Cheers
Alloush

[Alloush]

Sorry I mean this way

[TiTou]

Sory I can t open your VI..

What version of LabVIEW doyou have ??

[Alloush]

I have version 8.0 But here is a screen shot


Cheers
Alloush