Characteristics of Instruments are of two types, Static Characteristics & Dynamic Characteristics. Following is the definition, comparison and difference between the Static & Dynamic Characteristics
| Static Characteristics | Dynamic Characteristics |
|---|---|
| Defination of Static Characteristics –Characteristics of a measuring instrument refer to the case where the quantities that are mostly constant or may vary slowly with time, i.e. they remain static without varying. E.g., Precision, Accuracy, Linearity, Repeatibility, Sensitivity, Threshold, Resolution, Drift, Range, Stability, and Tolerance. | Defination of Dynamic Characteristics –Characteristics of a measuring instrument refer to the case where the quantities fluctuates/ changes rapidly with time, i.e. they varies continuously. E.g., Speed of Responce, Fidility, lag and Dynamic error. |
| Some applications where desired input to the instrument may be constant for varying very slowly with respect to time. | In certain situations or applications where the desired input is not constant but varies rapidly with respect to time. |
| In such cases circumstances, a set of criteria that gives a meaningful description of quality of measurement are called static characteristics. | In such cases, the dynamic relations between input and output gives a performance quality of instrument are called dynamic characteristics. |
| Generally for a time-independent signals or system(process), only the static characteristics to be considered. | Generally dynamic characteristics are governed by the relevant differential equation application, in given situation for a given system or process. |
Thus, overall quantitative performance qualities of the instruments are represented by both Static and Dynamic Characteristics.