Air buoyancy equal to the weight of the displaced air. Vertical component of the magnetic interaction between the weight and the balance or the environment, or both. H and M are vectors; z is the vertical cartesian coordinate. If magnetic effects are negligible, i. The mass of the weight is the assigned nominal value plus the assigned correction. Positive corrections indicate that the weight embodies more mass than is indicated by the assigned nominal value.
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Mikall NOTE 4—Materials used to make weights for special applications that do not fall within the density limits stated above, should have stated densities or density determinations performed. Adjusting material can be used as long as it is of a material at least as stable as the base material and is contained in such a way that it will not become separated from the weight.
From the context it is usually clear in which sense the term is used. Markings shall not perforate or crack sheet metal weights.
If magnetic effects are negligible, i. We need your help to maintenance this website. For weights of higher precision, the range of density is limited to values at or near the density of well-established standards, such as are used by primary calibration laboratories. Historical Version s — view previous versions of standard. Troemner individual weights are not supplied in cases.
For weights larger than g, a velvet lined compartment for each weight exists within the wood case. One-piece weights are difficult to manufacture as the only method of final adjustment is removing material by polishing. Class 0 weights mg and lower are made of sheet metal and are one-piece construction with one side turned up to make them easy to handle with forceps.
Link to Active This link will always route to the current Active version of the standard. NOTE 2—Maximum Permissible Errors for weights of denomination aetm between those listed, the maximum permissible error shall be proportional to the values shown. Class 0 weights 1 g and larger are of one-piece construction using Troemner Alloy 8 Stainless Steel, which has a consistent density.
These weights are designed for your most demanding weighing applications. Weights made of wire or too small to be marked shall not be marked but should be identifiable by their shape or number of bends. There is a cavity below the knob thread in the body which contains adjusting material, typically the same material from which the weight is made. If it can be assumed that the type B uncertainty estimates are conservative with infinite degrees of freedom, the formula has the form: This uncertainty contribution is applicable, if it is known from previous interchanging measurements with weights of the same nominal value.
The weights are manufactured of the finest stainless steels available including Troemner Alloy 8 Stainless Steel, which was developed by Troemner and is available exclusively through Troemner. If previous calibration values are not available, the estimation of uncertainty has to be based on experience. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Troemner UltraClass weights can also be used to calibrate Class 1 weights. Vertical component of the magnetic interaction between the weight and the balance or the environment, or both. The mass of the weight is the assigned nominal value plus the assigned correction. These maximum permissible errors apply to conventional mass values. Please help us to share our service with your friends. Class 1 weights can also be used to calibrate Class 2 weights. If the values of all local measurements of magnetization and susceptibility are less than these limits, then it may be assumed that the uncertainty components due to the magnetism of the weight are negligible.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. A larger uncertainty cannot be arbitrarily chosen. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Other cylindrical class 6 and 7 weights of 5 asym or greater shall be made of grey cast iron or of another material e brittleness and resistance to corrosion is similar or better than that of grey cast ast.
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