Problems with task in data acquisition

[Pablo!]

Hallo,

I'm trying to acquire current measures and then converting it in different values (temperature, pressure and flow). For this reason I've created a specific task in which every current measure is converted in the apposite measure and obviously for every channel the acquisition rate is setted (for examplethe acquisition rate for the temperature can be slowly than the flow).

I tried to generate code with example from the task constant, but nothing is displayed in the waveform graph.

If I use the daq assistant everything is ok.

I think to make mistakes with the generation of the task but I can't understand where is the error exactly.

Another thing that I've noticed is that sometimes there are problems in the visualizations of the scaled values also using the daq assistant, may be is better to scaling the values outside the task and then visualize and storage it?

[Dennis_Knutson]

I'm not sure I understand what you have done. You can't set a different acquisition rate for each channel in a task and if you created a task for each channel, you can't run them at the same time.

If you have a DAQ Assistant that is working, just right click and select 'Generate DAQmx Code'.

[Pablo!]

Hi Dennis, i'll try to explain me better.

For now I've created only one task  with the same acquisition rate for each channel, I'm a newbie and I'm testing Labview to see what I can do.

For now I've 3 channels, every channel is a current input and each one correspond to a different type of measure.

If I use the daq assistant the VI works bot only if I don't use the scale, if I use the temperature scale it doesn't display temperature over 21°C.

If I generate code by the daq assistant it doesn't works.

I've tried to work with voltage instead current, in this case the code it's ok, but I've the same problems with the scale that I've created in MAX: the vi doesn't works.

 

[Pablo!]

These are the files, how should I modify the the voltage task.vi in order to scaling tha value of the channels?

Message Edited by Pablo! on 02-01-2010 05:25 AM

[Dennis_Knutson]

I don't have a program to uncompress that.

[Pablo!]

I'msorry, here is the .zip.

[Dennis_Knutson]

I don't know what you are trying to do with that code. You are not defining any scale at all. Teh custom scale name is blank.

[Pablo!]

These files are about the simple acquisition, without scaling.

Now I'm not in laboratory and I can't post the vi with the scaling.

My question is: could I modify this code in order to scaling tha values as I want?

P.S. Thanks for your patience Dennis 😉

Message Edited by Pablo! on 02-01-2010 11:20 AM