Define the terms accuracy, Precision, Resolution, Drift and Relative limiting error.
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
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.
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 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
Where, Aa = Actual value
As = Nominal Value
Explain how a low resistance is measured by a potentiometer
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Explain the difference between Dynamometer type wattmeter and induction type wattmeter.