Electrical Engineering ⇒ Topic : Modes of Measurements
Modes of Measurements Following are the three modes of measurement:-
Primary measurements In this case the sought value of a parameter is determined by comparing it directly with reference standards.There is no conversion of measure and in terms of length.
Examples(i) Measurement of time by counting the number of strokes of a clock.
(ii) Matching of two lengths when determining the length of an object with a ruler.
Secondary measurements The indirect measurements involving one translation are called secondary measurements.
Examples (1) The pressure measurement by manometers
(ii) The temperature measurement by mercury in-glass thermometers.
Tertiary measurements The indirect measurements involving two conversions are called tertiary measurements.
Example The measurement of the speed of a rotating shaft by means of an electric techometer
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