The separation of three concepts of activity, accuracy and resolution of force sensor:

Usually, we often refer to the activity, accuracy and resolution of pressure sensor. However, many people are not very clear about the difference between these three parameters, leading to big and small problems in application. Below, we give a brief introduction to the differences between the activity, accuracy and resolution of the sensor.

Activity

Concept: It refers to the ratio of output change △y to input change △x of the sensor in steady-state operation, that is, the dimensional ratio of output and input. For example, when the displacement of a displacement sensor is changed by 1mm and the output voltage is changed to 200mV, its activity should be expressed as 200mV/mm.

Sensor activity is the slope of the output-input characteristic curve. If there is a linear relationship between the output and input of the sensor, the activity S is a constant. Otherwise, it will change as the amount of input changes.

When the output and input dimensions of the load cell are the same, the activity can be understood as the magnification. The higher the degree of activity, the narrower the range of measurement, and the worse the stability.

Precision

Concept: refers to the maximum difference between the measured value and the true value. If the measurement accuracy is higher, the sensor with a smaller range should be selected.

Resolution

Concept: It refers to the ability of the transducer to feel the smallest change in the measurement. That is to say, if the input changes slowly from a non-zero value, when the input change value does not exceed a certain value, the output of the sensor will not change, that is, the sensor can not distinguish the change of the input. Only when the input changes more than the resolution, the output will change.