All strain gage-based transducers show a small signal variation under constant loading which approximately has the form of an exponential function. This process is also called "creep upon loading". With the transducer being relieved of the force, the signal changes in the reverse direction inmore or less the same way. This process is also called "creep upon unloading".
The time period during which the value has been determined is specified in addition to the maximum value of the signal variation in percent.
It is essential to keep in mind that the creep influence must not be calculated relative to the nominal (rated) force but, instead, always needs to be calculated relative to the force applied. HBM specifies the creep value after 30 minutes; due to the typical form of an exponential function, this value can be assumed in good approximation as the creep maximum. This value must in no case be linearly extrapolated.
Characteristics of force transducers
Benefit from our practical on-line glossary to look up the most important technical terms in the field of force measurement: