Zero strain readings at the start of a test using Daq Assistant

[ManjunathaPrasad]

Hi James.

          I have been working on this circuit for quite a while. I am using two DAQ Assistants to read strain from CH0 and CH1 of NI 9237 ( DAQ Assistant  is reading CH0 and DAQ Assistant 2 is reading strain from CH1). But everytime i run it i am getting a error " 50103 : The specified resource is reserved ".. what does this mean??.. i have also used a merge option to combine both the graphs in a single Plot. Kindly help me out in figuring this. I have a project due next week. really appreciate it. 

I have also Attached the VI.. kindly have a look at it

[Dennis_Knutson]

Do NOT use two daq assistants. This is a common error that beginners make and has been discussed numerous times. Use a single assistant with both channels in it. You missed the instructions on how to do this when you created the first assistant but it's easily fixed by opening the first up and clicking on the Add button.

[ManjunathaPrasad]

Hi dennis,

          I tried that but how do i make them both zero at the start of the experiment once i hit tare button??.. i want them to start with both the strains zero.

[Dennis_Knutson]

Then save the values in two shift registers instead of one like was shown earlier. I never use the evil dynamic data or the daq assistant but you can use the split signal function to get each channel.

[ManjunathaPrasad]

Thanks Dennis. worked perfectly

[ManjunathaPrasad]

Hi Dennis,

               Thank you for the earlier help. I got two seperate signals in a single graph. But now i want to plot strain 1 data on x axis and strain 2 data on y axis instead of strain 1 and 2 both on y axis so that i get a linear graph for same deflection on both the gauges. Attached is the VI that works well. Can you please tell me how to plot one strain value on x axis and another on y axis in the same graph?

[James-B]

Instead of the Waveform Graph type, use the XY Graph.  This way you can bundle together the two data, and it will plot one on the X axis and one on the Y.  I would look through the help documentation on the various types of graphs.

[ManjunathaPrasad]

Hi James,

           I tried bundling the two signals and plotting them on an XY graph. But it is giving me an error " connection of channels of two different types ".

How i get the XY plot?

[Dennis_Knutson]

Please attach an image of your block diagram do someone can see your mistake.

[ManjunathaPrasad]

Here is the block Diagram. I am getting a straight line on X and Y axis. no graph is displayed