2. What do you mean by sensitivity and accuracy fo
dynamic measurement?
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Answers
Answer:
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Explanation:
Sensitivity :-
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The sensitivity denotes the smallest change in the measured variable to which the
instrument responds. It is defined as the ratio of the changes in the output of an
instrument to a change in the value of the quantity to be measured.
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Accuracy :-
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It is the degree of closeness with which the reading approaches the true value of
the quantity to be measured. The accuracy can be expressed in following ways::
a) Point accuracy:
Such accuracy is specified at only one particular point of scale.
It does not give any information about the accuracy at any other Point on the scale.
b) Accuracy as percentage of scale span:
When an instrument as uniform scale, its accuracy may be expressed in terms of
scale range.
c) Accuracy as percentage of true value:
The best way to conceive the idea of accuracy is to specify it in
terms of the true value of the quantity being measured. Precision: It is the measure
of reproducibility i.e., given a fixed value of a quantity, precision is a measure of
the degree of agreement within a group of measurements. The precision is
composed of two characteristics:
a) Conformity:
Consider a resistor having true value as 2385692 , which is being measured by an
ohmmeter. But the reader can read consistently, a value as 2.4 M due to the
nonavailability of proper scale. The error created due to the limitation of the scale
reading is a precision error.
b) Number of significant figures:
The precision of the measurement is obtained from the number of significant
figures, in which the reading is expressed. The significant figures convey the actual
information about the magnitude & the measurement precision of the quantity.
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