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Dynamic => measuring a varying process condition.
Dynamic behavior of instrument is determined by subjecting/forcing its primary element to unknown and predetermined variations in the measured quantity.
Most common variations in the measured quantity :
1. Step change
2. Linear change
3. Sinusoidal change
1) Step Change
Primary element is subjected to an instantaneous and finite change in measured variable.
2) Linear Change
Primary element is following the measured variable, changing linearly with time.
3) Sinusoidal Change
Primary element follows a measured variable, the magnitude of which changes in accordance with a sinusoidal function of constant amplitude.
Speed of response
The rapidity with which an instrument responds changes in measured quantity
Dynamic error
The difference between the true and measured with no static error
Lag
Delay in response of an instrument to changes in the measured variable.
Fidelity
The degree to an instrument indicates the changes in the measured variable without dynamic error
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1.10 Statistical analysis
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