What is the difference between absolute and secondary instruments?
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The difference between absolute and secondary instruments are tabulated below.
Absolute instruments
Secondary instruments
The values of the quantity to be calculated in terms of physical constants and their deflection are given by Absolute Instruments.
Secondary instruments are tools whose production is calculated to give the quantity’s value.
It is not necessary to calibrate them and there is no need to compare them with the other standard instruments.
The quantity to be evaluated should be measured by the amount of the deflection of these devices.
Absolute instruments are being used as standardization methods in laboratories.
It is important to calibrate these tools against an absolute instrument. Secondary instruments are utilized in day to day life.
Examples – Absolute electrometer, tangent Galvanometer etc
Examples – Voltmeter, ammeter etc