Define the terms accuracy, Precision, Resolution, Drift and Relative limiting error.
Accuracy:
Accuracy of measurements mean conformity to truth. It is the closeness with which an instrument reading approaches the truth value of the quantity being measured
Precision:
It is a measure of reproducibility, i.e. it is a measure of the degree of agreement within a group measurement. Precision is composed of two characteristics- a) Conformity, b) no of significant figure.
Precision is used in measurement to describe the consistency or the reproducibility of the result.
In short, Precision is the degree of Reproducibility.
Resolution:
It is defined as the smaller change in a measured variable to which an instrument will respond i.e. Resolution of an instrument is the measurement of minimum quantity.
Drift:
Drift is an undesirable quantity in industrial instruments because it is rarely apparent and cannot be easily compensated for.
Relative limiting error:
We define the relative error to be the ratio between the absolute error and the absolute value of the correct value and is denoted by Er
\(Er=\frac{Aa-As}{As}\)
Where, Aa = Actual value
As = Nominal Value
What are the special features of a high voltage Schering bridge? What is meant by “Wagner’s Earth”?
What are absolute & secondary instruments ? Why is damping required in a measuring instrument ?
Write short notes on:
State Channel capacity theorem
Draw and explain the square – law modulator.
