Multiple strain gauges

[labview.edu]

Hi,

I am trying to run a simple application, where multiple strain gauges are to be read, nothing fency. I am using a Gauge indicator to dispaly the strain reading so far so good. The problem arise when I am connecting the multiple gauges, I am not sure how to assign the individual Indicators to different strain gauge, so all my gauge indicators end up showing the same value. What I want is that different gauge indicator display the reading from different strain gauges.

Hardware: Labview 8.5.1, SC-2345 connector block, SCC-SG01 Strain module, PCI-6251 DAQ Card.

Thanks,

Sine

[walter-donovan]

Can you post your vi?

[RavensFan]

Are you using Express VI's?  If so, you will need to split the signals before sending to each indicator.

[labview.edu]

How can I split the signal? I am new to the labview. I am attaching the pictures of back and front panel.

Thanks,

Sine

[RavensFan · Accepted solution]

On the block diagram, go to Express  --->  Signal Manipulation.

You will see functions for merge and split signals.  These are exandable.  You can grab the bottom and drag them down so you can create more inputs (for merge) or outputs (for split) as needed.

Eventually you'll want to get a way from using the Express VI's, but they are good for getting a beginner started quickly.

To learn more about LabVIEW, I would recommend looking at the online LabVIEW tutorials
LabVIEW Introduction Course - Three Hours
LabVIEW Introduction Course - Six Hours

[labview.edu]

Thanks to your split signal tip the gui is working! I made this GUI to null the strain gauges (manually, by turning the resistance of the strain gauge module). I am new to Labview, is there anyway I can null the strain gauge without having to adjust the delicate screw on the module?

Thanks for your help,

Sine

[RavensFan]

I don't know of any other way to null the strain gages for these modules.

One thing you could do is to take an initial reading in your program with the gages unloaded, and subtract that from all subsequent readings.

[Jice]

I may be a bungling idiot bt i dont seem to get a good signal from my scc-sg01, whatever i try the signal remains- -0.001700.

I've followed the manuals of both the scc-sg01, the SC2345 and my DAQ card PCI 6221 over and over again.

Can somebody help?

[enderWiggin10]

Hi Jice,

I took a look at your DAQ Assistant Setup.  It appears that your signal could be railing at -0.0017 because you have set a signal input range of -1m to +1m, or -0.001 and +0.001; you will actually be able to get a signal slightly above and below this range though.  Try setting a range of -0.07 to +0.07 or -70m to +70m.  This might allow you to see the actual value instead of the software imposed railing value of -0.0017.  Does this help?

Best,

[Jice]

Thanks Adam,

It works for channel 2 however channel 1 display a value of -0,0787, i've tried the shutn calibration and the trick of changing the limits. however when I use a value above +-70m, I get an error. Is the scc-sg01's channel 1 fried or am I still doing something wrong.

With kind regards Jordy