What are various types of systematic errors ?

Explanation

Systematic errors are of three types :
(i) Instrumental error : Instrumental error is caused due to the improper functioning of the insturements . For example pointer of weighing machine sometimes does not coincide with the zero mark. Due to this, weight given by the machine is not correct.
(ii) Personal error : Personal error is caused by the mistakes committed by the person making observations.
(iii) Natural error : Natural error is caused due to the change in the conditions of environment.