In order to get high repeatability (low repeatability error) and low creep from a calibration class load cell, the following conditions need to be met:
The cell sensing element must be mounted on a flat surface.
The load cell sensing element must be rigidly fixed, meaning bolted down, to the structure.
The load cell element should be torqued-down evenly to avoid distortion.
Any threads used in the loading path should be pre-tensioned to avoid thread creep during the load cycle.
All compressive forces should be applied absolutely perpendicular to the sensing element and any side loading should be avoided.
All tensile forces should be applied to the load cell absolutely perpendicular to the sensing element.