Question

2. What do you mean by sensitivity and accuracy fo
dynamic measurement?

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Answer 1

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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