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Static characteristics of measurement system


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about brief idea on measurement



Measurements

1. Static :The characteristics involved in the measurement of quantities that are either constant or slowly varying with time to define a set of criteria that gives meaningful description is called as static characteristics

2. The main static characteristics are:

Accuracy: it is defined as closeness with which an instrument reading approaches true value of quantity being measured.

Precision: it is measure of the degree of agreement within group of measurement.
Sensitivity:
This is ratio of the magnitude of output signal or response to input signals being measured.

Reproducibility:
It is degree of closeness with which a given value may be repeatedly measured.

Drift:
It is undesirable quality in industrial instruments as it is rarely apparent & cannot be easily compensated for

Static errors:
It is defined as difference between the measured value & true value of the quantity

Dead zone:
It is defined as the largest change of input quantity for which there is no output of instrument


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