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Quantify Accuracy of Load Cell

Quantify Accuracy of Load Cell

(OP)
Can't convince myself I'm doing this right.

0 - 25lb load cell
10V excitation
Rated Output: 2mV/V

nonlinearity: .10%
nonrepeatability: .05%
hysteresis: .10%
zero balance: 1.0%

E* = sqrt(.002^2 + .001^2 + .002^2 + .02^2) = 0.02 mv/V accuracy
*those numbers represent error % * Rated Output in mV/V

if I have 25lb/20mV full output at 10V excitation,
then my accuracy in lb is (25lb/20mV)*.02 mV/V = +/- .25 lb accuracy.

Disregard my amp and DAQ for the time being, I am just trying to assess the sensor. Thank you for any feedback, I can never straighten this out in my head.

RE: Quantify Accuracy of Load Cell

Specifically, the hysteresis and non-linearity are not random errors. Also not clear why you doubled the error values in the RSS sum.

RE: Quantify Accuracy of Load Cell

OP, can you please post a link to the datasheet?

xnuke
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RE: Quantify Accuracy of Load Cell

Ahh, I read that as percent error, thanks Irstuff. And yeah, zero balance...

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