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How to Calibrate Button Load Cells and Achieve Good Results

Anyone that has tried to calibrate button type load cells knows they do not repeat well in rotation.  The sensitivity to off-axis or side loading conditions is quite high.  High enough that 0.1 % of misalignment is going to produce a rather large cosine error.   The error can sometimes be as large as 10 % of rated output.  We typically find this error to be between one and two percent in are well aligned deadweight machines.  This blog is going to show that using the proper adapters can drastically improve the performance of button load cells.  


Problem:  

It's nearly impossible to get results to agree within 0.5 % when repositioning a button load cell.   


With traditional calibration methods shown in figure 1 below, getting reproducible results on button type load cells is nearly impossible.