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A physical measure of mass, whose constructional and metrological characteristics are determined by shape, size, material, finish, nominal value and maximum permissible error.
Series of weights generally presented in a box, in such a combination as to allow weighings of all loads from the smallest nominal weight up to the sum of all the weights in the set, in a sequence of which the smallest nominal weight in the set is the unit.
The sequence in a set of weights is generally as follows:
(1; 1; 2; 5) × 10n kg
(1; 1; 1; 2; 5) × 10n kg
(1; 2; 2; 5) × 10n kg
(1; 1; 2; 2; 5) × 10n kg
In these expressions, n represents either zero, or a positive or negative whole number.
Weights used in the inspection of weighing machines and weights are known as standard weights.
The nominal value of the weights must be equal to 1 × 10n kg, or 2 × 10n kg, or 5 × 10n kg; in these expressions n represents either zero or a positive or negative whole number.
Nominal Values | Class E1 | Class E2 | Class F1 | Class F2 | Class M1 |
---|---|---|---|---|---|
50 kg | 25 | 75 | 250 | 750 | 2 500 |
20 kg | 10 | 30 | 100 | 300 | 1 000 |
10 kg | 5 | 15 | 50 | 150 | 500 |
5 kg | 2·5 | 7·5 | 25 | 75 | 250 |
2 kg | 1·0 | 3·0 | 10 | 30 | |
1 kg | 0·50 | 1·5 | 5 | 15 | 50 |
500 g | 0·25 | 0·75 | 2·5 | 7·5 | 25 |
200 g | 0·10 | 0·30 | 1·0 | 3·0 | 10 |
100 g | 0·05 | 0·15 | 0·5 | 1·5 | 5 |
50 g | 0·030 | 0·10 | 0·30 | 1·0 | 3·0 |
20 g | 0·025 | 0·080 | 0·25 | 0·8 | 2·5 |
10 g | 0·020 | 0·060 | 0·20 | 0·6 | 2·0 |
5 g | 0·015 | 0·050 | 0·15 | 0·5 | 1·5 |
2 g | 0·012 | 0·040 | 0·12 | 0·4 | 1·2 |
1 g | 0·010 | 0·030 | 0·10 | 0·3 | 1·0 |
500 mg | 0·008 | 0·025 | 0·08 | 0·25 | 0·8 |
200 mg | 0·006 | 0·020 | 0·06 | 0·20 | 0·6 |
100 mg | 0·005 | 0·015 | 0·05 | 0·15 | 0·5 |
50 mg | 0·004 | 0·012 | 0·04 | 0·12 | 0·4 |
20 mg | 0·003 | 0·010 | 0·03 | 0·10 | 0·3 |
10 mg | 0·002 | 0·008 | 0·025 | 0·08 | 0·25 |
5 mg | 0·002 | 0·006 | 0·020 | 0·06 | 0·20 |
2 mg | 0·002 | 0·006 | 0·020 | 0·06 | 0·20 |
1 mg | 0·002 | 0·006 | 0·020 | 0·06 | 0·20 |
A one-gramme weight may have the shape of multiples of one gramme or the shape of the sub-multiples.
The shapes of the weights shall give an indication of their nominal value.
Polygonal laminated strips, their shape and values:
triangle for 1 — 10 — 100 — 1 000 mg
quadrilateral for 2 — 20 — 200 mg
pentagon for 5 — 50 — 500 mg
Polygonal wire segments and their values:
1 segment for 1 — 10—100 — 1 000 mg
2 segments for 2 — 20 — 200 mg
5 segments for 5 — 50 — 500 mg
Where two or three weights in the set are identical, they shall be distinguished by one or two asterisks or dots respectively in the case of laminated strips and one or two hooks respectively in the case of wires.
The surface of class M1 10 kg to 1 kg cylindrical weights shall be polished, and shall show no porosity to the naked eye. The surface condition of class M1 50, 20, 10 and 5 kg parallelepiped weights shall be comparable to that of grey cast iron carefully cast in a fine sand mould.
Weights of F1 and F2 accuracy classes with an adjustment cavity shall be adjusted either with the same material as that of which they are constituted, or with pure tin, or with molybdenum.
ClassM1 weights may be adjusted with lead.
in classes E1 and E2 shall bear no indication of their nominal value;
in class F1 shall bear only the indication of nominal value as laid down in point 9.2.1.; this indication shall be burnished or engraved;
in class F2 shall bear the inscriptions of class F1 accompanied by the letter F;
in class M1 shall bear the nominal value marked in figures followed by the symbol of the appropriate unit, either recessed or embossed, on the upper face of the body or knob of the weights.
Cylindrical weights shall be marked with the letter M, either recessed or embossed; parallelepiped weights shall be marked with the letter M which need not be recessed or embossed.
kilogrammes for weights of 1 kilogramme or more,
grammes for weights of 1 gramme to 500 grammes.
Boxes containing E1, E2, and F1 class weights, and all boxes containing the gramme and sub-multiples of the gramme, shall be sealed with the EEC final verification mark.
For class F2 weights the EEC final verification mark shall be affixed to the cover of the adjustment cavity, and where there is no adjustment cavity, upon the base of the weight. For class M1 weights of one gramme to 50 kg the EEC final verification mark shall be placed upon the lead sealing the adjustment cavity opening, or upon the base in the case of weights having no adjustment cavity.
individual weights or series of weights up to a value of 500 grammes shall be contained in boxes,
weights having a nominal value greater than 500 grammes may be contained in boxes, fitted in a stand or presente d individually, without protection.