Wheatstone Bridge Phidget - "Tare" button

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indianapolisjones
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Wheatstone Bridge Phidget - "Tare" button

Postby indianapolisjones » Thu Mar 14, 2019 5:11 pm

I'm using a DAQ1500 and two strain gauges to measure torque on a shaft for a school project. I have done the "y = m * v/v + b" straight line calibration, but sometimes the y-intercept "b" value is off after removing/attaching the shaft, resulting in the zero-load value to be slightly non-zero. Is there an easy way to add a reset(tare) button for the b value?

jdecoux
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Re: Wheatstone Bridge Phidget - "Tare" button

Postby jdecoux » Fri Mar 15, 2019 9:50 am

The easiest way to zero a load-cell based scale is to change your equation to "y = m (x - x0)" where x is the voltage ratio reading, and x0 is the voltage ratio of the scale you want to call zero.

It's the same equation, just formatted in such a way that it's very easy to change the value of x0 without additional calculations.


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