Question:
Published on: 23 June, 2022

Define the terms accuracy, Precision, Resolution, Drift and Relative limiting error.

Answer:

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

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