# Static Error vs Dynamic Error | Difference between Static Error and Dynamic Error

This page compares Static Error vs Dynamic Error and mentions difference between Static Error and Dynamic Error.

What is Error in measurement?
An error is defined as difference between the measured value and its actual value. For example, two operators can take different measurement of the same parameter under measurement with the same instrument. The difference in both the measurement is called error.
➨Error = Measured value - True value
➨Error = -Accuracy

## Static Error

Definition:
• It is defined as difference between the measured value of the quantity and its true value.
• It can be expressed mathematically as follows.
➨ Static Error (δA) = Am - At
Where,
Am = Measured value of quantity or actual value
At = True value of quantity or nominal value

## Dynamic Error

Definition:
It is the difference between true value of quantity changing with time and the value indicated by measurement system if no static error is assumed.