Performance characteristics
(a) static
characteristics.
(b) dynamic
characteristics.
- Speed of response and measuring lag,
- Fidelity and dynamic error,
- overshoot,
- Dead time and dead zone,
- Frequency response.
(a) Speed of response and measuring lag:
Speed of
response is defined as quick with which an instrument responds to change the
value of quantity which is being measured.
Measuring
lag refers to the delay in the response of an instrument to change in the input
value.
(b) Fidelity and dynamic error:
Fedility is
defined as the degree of closeness with which the instrument indicates or
records the signal.
Dynamic
error is defined as the difference between the indicated quantity and true
value.
(c) Overshoot:
It is
defined as the maximum amount by which the pointer moves behind the steady
state.
(d) Dead time and Dead zone:
The time is
defined as the time required for the instrument to begin to respond change the
measure point.
Dead zone is
defined as a largest change of the measuring to which the instrument does not
respond.
(e) Frequency response:
Maximum frequency
of the measuring variable of a instrument is capable of following the error.
Frequencies
of the measured variable should not exceed 60% of the natural frequency of
measuring instrument.