These standards are similar in design to primary, secondary & tertiary standards. The measurement obtained directly by observation and comparison is called primary measurement, it needs no convertion, e.g., measuring length,. Measurements may be classified as primary, secondary and tertiary based upon whether direct or indirect methods are used.
Measurements may be classified as primary, secondary andtertiary. Examples of instruments that perform. It is difficult to measure the stress directly, but a strain gage can be used to measure the strain, and then the stress can be determined using the hooke’s law.
Direct measurement is measuring exactly the same quantity you want to measure, while. When direct measurement is not possible, the indirect measurement method is used. Based upon whether direct or indirect methods are used. But being less in cost and are made of low grade materials, they are used for general applications in metrology.
Measurements are classified as primary, direct comparison to standards, secondary, one conversion of the quantity, or tertiary, two conversions. Primary, secondary and tertiary measurements: Standard of measurement subdivision of standard1.