Tolerable Negative Error
Error tolerance decreases as nominal quantity increases, by alternating intervals of a given percent error with intervals of a given amount error: these interpolate between the stair-step decreases in percentage error.
Thus, for instance over the interval 50–100, the tolerable error is 4.5 grams or millilitres (referred to as units in the table below). At the left end of the interval, this is 4.5/50 = 9% error (as with the interval 5–50), while at the right end of the interval, this is 4.5/100 = 4.5% error (as with the interval 100–200). The factor of 2 reduction in percentage tolerable error (9% to 4.5%) corresponds to the size of the interval (50–100).
| Table of tolerable negative errors | |
|---|---|
| Nominal quantity in g or ml |
Tolerable negative error |
| 5–50 | 9% |
| 50–100 | 4.5 units |
| 100–200 | 4.5% |
| 200–300 | 9 units |
| 300–500 | 3% |
| 500–1000 | 15 units |
| 1000–10000 | 1.5% |
When using the table, the values of the tolerable negative errors shown as percentages in the table, calculated in units of weight or volume, shall be rounded up to the nearest one-tenth of a gram or millilitre.
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