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time constant
Definition

The appropriate product category
 Firstorder delay elements vary with the characteristics of an exponential function. A simple way to express the speed of change is thus desirable. A way called the “time constant” is used. The time constant estimates the time required to reach 100% if the slop at startup (0%) is maintained. It is, however, difficult to find the time constant from the startup slop. If the value after a time equivalent to the time constant in measured in firstorder delay calculation, it will be approximately 63%. Thus, the time required to reach 63% is measured and used to calculate the time constant.

The appropriate product category
 In a linear primary delay system, the time required for an output to reach approximately 63% of the total change when a stepwise input is applied.

The appropriate product category
 Time required to reach approximately 63% of the final value when a step input is entered in a firstorder linear delay system.