The stiffness of a load cell is an important parameter for designing the scale because it provides information about the static and dynamic behavior of the load cell such as:
- natural frequency of vibration;
- the settling time of the cell;
- the cell arrow.
Knowing the value of the weight applied and accurately measuring the arrow “x” i.e. how far the cell has moved the free end as a result of applying a known mass, it is possible to calculate the value of the K stiffness.
P = k x
Where P is the weight placed on the cell, x is the arrow after the weight application and k is the stiffness.
The precision with which K METER measures cell displacement is one nanometer, so using a sample weight of class E1 of up to one kilo measures stiffness with a precision of 0.5 mg/nm.