ASTM E Tolerances have been converted from avoirdupois to metric and rounded to two significant figures. Nominal Size. Class 0. Class 1. Class 2. services. The weight portfolio covers both OIML and ASTM weights from ASTM weights are available in classes 1 – 6 matching requirements of ASTM E International Organization of. Legal Metrology Recommendation R Troemner UltraClass Series. ANSI/ASTM E NIST Handbooks**. Weight. Class. E0*.
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Wood cases for individual weights are available for weights 1 g and larger. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
Abbreviations are shown in Appendix X2.
The outer diameter, top and bottom surface roughness must meet Table 6. The Sheet Metal Weights come standard with the weight products. The cases are designed so that each weight will stay in its compartment.
Only the numerical portion of the weight value needs to be on asrm surface of weights. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Size px x x x x Both sheet metal and wire weights shall be free of cracks such as may be formed from bending.
This specification e67 National Bureau of Standards CircularSection 1, which is out of print.
In most cases, the uncertainty contribution uE is already covered by the uncertainty uw of the weighing process and may be neglected. Otherwise, due to their one-piece design, Class 0 weights will not maintain their measured value within the tolerance class. The surface of the weights may be treated with a suitable coating in order to improve their corrosion resistance.
The body of the weight is one piece and the knob of the weight is the second piece. It is the finest grade of stainless steel available and is similar to material originally specified in the manufacture of state primary standards. 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. Class 0 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured.
They should be used in extremely stable environments and handled with the highest level of care. The lifting knob is specifically designed for use with forceps, tweezers or some other lifting device. A precise measurement of density can only be made for one-piece weights. For reference standards, stability and information about the values of the weights is more important than the closeness of the values to nominal.
If the sensitivity is not constant with time, temperature and load, its variation must be included in the uncertainty. If it can be assumed that the type B uncertainty estimates are conservative with infinite degrees of freedom, the formula has the form: Troemner individual weights are not supplied in cases. A number in parentheses indicates the year of last reapproval.
They can also be used to calibrate Class 3 weights. We are a non-profit group that run this website to share documents. One-piece weights are difficult to asrm as the only method of final adjustment is aetm material by polishing. National prototype standard—platinum-iridium kilogram identified as K20, maintained at the National Institute of Standards and Technology, with value assigned relative to the International Prototype Kilogram provides the United States access to the mass unit.
Class 1 weights can also be used to calibrate Class asrm weights. There are no markings indicating nominal value on any Class 0 weights. The acceptable maximum values for user markings are given in Table 7. For these classes of weights, if the standard deviation of mass difference measurements is not known from historical data, it can be estimated as: Permission rights to photocopy the standard may also be secured from the ASTM website asrm.
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.
ASTM E – Free Download PDF
Referenced Documents purchase separately The documents listed below are referenced within ast, subject standard but are not provided as part of the standard. Your comments will receive careful consideration at asym meeting of the responsible technical committee, which you may attend. A larger uncertainty cannot be arbitrarily chosen. This will lead to linear summation of uncertainties: For weights which have sealing caps, the cap may be made of aluminum.
All weights shall be free of ragged or sharp edges or ends. Class 2 weights can be used to calibrate weighing instruments for important commercial transactions like gold and precious stones.
Originally approved in Weights made of wire or 6e17 small to be marked shall not be marked but should be identifiable by their shape or number of bends. Please copy and paste this embed script to where you want to embed Embed Script.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
Class 4 weights can be used for calibration of semi-analytical balances and for student use. Physical characteristics shall be based on construction, design, surface area, materials, magnetism, density, surface finish, weight adjustment, and marking. Troemner weight sets where the largest weight is g and lower are supplied in attractive, durable polypropylene cases with a compartment for each weight within the case.
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.
Negative corrections indicate that the weight embodies less mass than is indicated by the assigned nominal value. Troemner UltraClass weights can also be used to calibrate Class 1 weights. For weights of higher precision, the range of density is e6177 to values at or near the density of well-established standards, such as are used by primary calibration laboratories. Minimum requirements for the number of weighing cycles are in Table