Errors of direct measurement
Errors of direct measurements are defined as
if there is one measurement (n = 1). And
if there are several measurements (n > 1). In these equations t¥ is Student's constant, it may be defined from the table on the crossing of line with n and column with a; d is error of an instrument; v is error of count, v =d/2. For example: the length of a body was measured three times:
The error of this measurement will be:
The relative error is
The final result is x = (13.3 + 0.5) mm, a= 0.7, E = 3.6 %.
|
, (2.11)
, (2.12)
=13.266, n=3, t=1.4, t¥=1, d=1 mm.
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