I am working on a project to find strain values of a testing sand sample and I found a strange kind of error.
I am connecting the circuit as shown below in the attachments. I am also using PLX-DAQ to log the data. When I am taking the output from A+ and A- both ends connected, I got the saturation as shown in the attachment of voltage 2.5V and sens read is constant.
When I disconnect one of the ends of A+ or A- it gives me 0.37V with fluctuated data as the noise effecting the sens. read.
I could not figure out the reason behind this error and I could not find anyone how got similar problem.
I am sure that the connection is perfectly fine but I don’t know I have checked multiple times.