What are the dynamic characteristics of instrument?

The behavior of such a system, where as the input varies from instant to instant, the output also varies is known as dynamic response of the systems. Hence, the dynamic behavior of the system is also important as the static behavior.
The dynamic characteristics of measurement system are given below,

• Speed of response
• Fidelity
• Lag
• Dynamic error

Speed of response:

It is the rapidity with which instrument respond to make the changes in the measured quality.

Fidelity:

It is the degree to which instrument indicates the change in measured variable without dynamic error.

Lag:

Lag is the retardation or delay in the response of an instrument to make the changes in measured quality.

Dynamic error:

It is difference between the true value of a quality changing with time and the value indicated by the instrument, if no static error is assumed.