Errors of instruments
Absolute error of instrumental d is a deviation
where a is an index of an instrument; X is the true value of the quantity measured. Typically d is quantity of the instruments minimum value scale. For example: the ruler error is d = 1 mm. Relative error of the measurement is the ratio of
It is usually expressed in percent
Brought error of the measurement or precision class is the ratio
expressed in percent. D is maximum value on the instrument scale. For example: electric current is measured by the instrument with interval 0 ÷ 1 A, precision class is 0.5. This means, that D = 1 A, g = 0.5 %, and
If the instrument shows 0.3 A, then
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, (2.6)
. (2.7)
. (2.8)
, (2.9)
.
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