08-06-2020 03:00 PM - edited 08-06-2020 03:37 PM
I'm trying to setup a Load Cell in Labview an having some trouble. I'm a complete beginner in Labview.
So, I set it up with DAQ Assistant with a Bridge setup (Voltage with Excitation). I originally set it up as a Force setup but when I got incorrect outputs I decided to switch to Voltage and do the math myself.
The equation I use to convert Voltage to Load is:
Load = Vo/Vex * (Full Scale Capacity/Sensitivity)
When I put my load cell in my calibrated load frame I'm off by a factor of 10 (for ex. I read 4 kips instead of 40).
The sensitivity of the LC is 2.2649 mV/V.
I can't figure out what I'm doing wrong, any help would be appreciated. My block diagram and DAQ Assistant windows screenshots are attached.
Hardware/Software
PXIe-1078 chassis
PXIe-4330Module
TB-4330 terminal block
Labview 2019
08-06-2020 03:18 PM
What hardware are you using to read in the signal from the load cell?
08-06-2020 03:38 PM
Ah, sorry forgot to mention it - I addded to the original post.
PXIe-1078 Chassis with embedded controller
PXIe-4330 module
TB-4330 terminal block
08-10-2020 08:54 AM
If I understand the documentation correctly, you are off by a factor of 10 as the card reads in ratiometric and not absolute meaning the base units will be in V/V not in Volts. Youwould need to multiply by the excitation voltage to get the correct value.
08-14-2020 08:21 AM
Ahh, thanks! For me the manual was a little clear but that does make sense.
11-03-2023 09:13 PM
could you share your code for this if you still have it?