ISO 10303-214:2010(E)
A Plus_minus_bounds is the specification of the allowable deviation from a numerical value.
The data associated with a Plus_minus_bounds are the following:
The lower_bound specifies the value of the tolerance that shall be subtracted from the exact value to establish the minimum allowed value.
The significant_digits specifies the number of decimal digits indicating the accuracy of the lower_bound and upper_bound values.
The significant_digits need not be specified for a particular Plus_minus_bounds.
The upper_bound specifies the value of the tolerance that shall be added to the exact value to establish the maximum allowed value.
The value_determination specifies information on how the Plus_minus_bounds shall be interpreted.
Where applicable the following values shall be used:
NOTE A Plus_minus_bounds may be specified in the design stage of a product but it may also be documented as measured on a manufactured part.
The value_determination need not be specified for a particular Plus_minus_bounds.
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