How to determine force using a measured current

[Hendrick]

Hi,

I'm trying to calibrate a voltage divider circuit to measure force. I have measured the current output at two different weights, converted the weights to forces using "f=mg" and calulated a gradient from that using "y = mx + c" as well as the constant.

However, I don't feel what I did was entirely correct because when I put the weights on the displacement transducer, my force is wrong.

Any help would be appreciated...


Thanks,

Hendrick

 

[Andrew Mason]

Can you show us a diagram of what it is you are doing? What is the electric device that you are applying the force to?

AM

 

[Hendrick]

I don't think I can show you a diagram, but I can try to explain it better:

I am applying force to a lorentz force motor which has a displacement transducer in it which produces a change in current when the height of the motor increases and decreases (you put your foot onto the plate of the motor). The current is being measured through LABVIEW from a data acquisition device hooked up to the motor.

There is actually a force transducer on the device but since it is very noisy, I am trying to measure force with the use of the displacement transducer.

So in other words, I need to calibrate the measured current into calculated force. I think the way I went about it was correct in theory but it doesn't work properly... Perhaps the displacement transducer isn't accurate enough...