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What is meant by (non-)repeatability?

A peculiarity of the load cell industry is that all manufacturers seem to publicise figures for non-repeatability but these figures essentially have little or no merit. These figures could be thought of as reference values rather than actual determined values. The reasons for this are that there are no standards or definitions for a specific parameter. Although non-repeatability is generally thought to mean the variation in output for repeated loadings under identical loading and environmental conditions, there are no uniform procedures for conducting and reporting an appropriate test. There are also no means for excluding the non-repeatability of the test equipment which is often as significant as the non-repeatability of the load cell. Better measurements of the meaningful repeatability can be found in the following parameters:

  • Eccentric load sensitivity
  • Creep
  • Interpolation error
  • Temperature effect on output
  • Temperature gradient sensitivity

Interface Low Profile load cells outperform all competitive products in these key parameters

When even greater repeatability is merited , a permanently installed stud  in the live end by Interface or by the user that is locked in under tensile load, provides still greater repeatability by isolating the load cell almost completely from end effects. The pre-loaded stud increases the height of an assembly, but the overall height is still the lowest of any load cell technology available. For ultimate repeatability special versions with integral machined studs offer further improvements over the jammed studs

 

Last updated: 13 May 2013

Keywords:
repeatability, non-repeatability, loadcell, load cell, low profile, pre-loaded, jammed, stud, creep, interpolation, error, eccentric, sensitivity

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