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14.—(1) The MPE, positive or negative in mm, between two non-consecutive scale marks is—
where—
L is the value of the length rounded up to the next whole metre; and
a and b are given in Table 1 below.
(2) When a terminal interval is bounded by a surface, the MPE for any distance beginning at this point is increased by the value c given in Table 1.
Accuracy Class | a (mm) | b (mm) | c (mm) |
---|---|---|---|
I | 0.1 | 0.1 | 0.1 |
II | 0.3 | 0.2 | 0.2 |
III | 0.6 | 0.4 | 0.3 |
(3) The MPE for the length between consecutive scale marks, and the maximum permissible difference between two consecutive intervals, are given in Table 2 below.
Length i of the interval | MPE or difference in millimetres according to accuracy class | ||
---|---|---|---|
I | II | III | |
i≤mm | 0.1 | 0.2 | 0.3 |
1 mm < i ≤1 cm | 0.2 | 0.4 | 0.6 |
(4) Where a rule is of the folding type, the jointing shall be such as not to cause any errors, supplementary to those above, exceeding 0.3 mm for Class II, and 0.5 mm for Class III.
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