Load Cell Calibration Mv V

Figure 3 above is an example of a morehouse calibration shear web load cell with a non linearity specification of better than 0 05 of full scale.

Load cell calibration mv v.

Most quality load cells will come with a factory load cell calibration sheet which specifies the actual sensitivity rating for that individual load cell. The millivolt output of a non amplified load cell is linearly proportional to the excitation voltage. If a load cell has a 5 volt dc vdc excitation voltage and a 0 250 mv output the resultant ratio is 250mv 5vdc. The cell output is rated in millivolts per volt mv v of the difference voltage at full rated mechanical load.

If the load cell s sensitivity is 3 mv v and the excitation voltage provided by the converter is 10 volts then the divider will be 30 millivolts or 0 03 volts. So a 2 96 mv v load cell will provide 29 6 millivolt signal at full load when excited with 10 volts. When shopping for load cells you are typically provided with two pieces of information about the load cell excitation voltage v orvdc and output mv. This load cell sensitivity value can be used to convert the load cell s output.

Divide the product from step 2 2 7 volt pounds by sensitivity in millivolts volt times the excitation voltage. This equates to 50 mv per volt or has a 50 1 ratio. Span sensitivity mv v this is the full span output per supply volt characteristic for the load cell wheatstone bridge. In this example the actual non linearity is about 0 031 using mv v values and 0 032 when using calculated values which is well below the specification.