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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The surface of the weights may be treated with a suitable coating in order to improve their corrosion resistance. A precise xstm of density can only be made for one-piece weights.
We need asttm help to maintenance this website. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Weights to be used with 8 Download From http: H and M are vectors; z is the vertical cartesian coordinate. Depending on the class, these weights may aatm may not be marked with their nominal value.
The acceptable maximum sstm for user markings are given in Table 7. Please see the Tolerance Chart within the Mass Standards Handbook for the specific tolerances of each weight in any given class. Only the numerical portion of the weight value needs to be on the surface of weights. Class 3 weights can be used for calibrating balances with moderate precision, with a readability as low as 0. Negative corrections indicate that the weight embodies less mass than ashm indicated by the assigned nominal value.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM E – 97() Standard Specification for Laboratory Weights And Precision Mass Standards
Please fill this form, we will try to respond as soon as possible. The unit of mass is the kilogram. Please help us to share our service with your friends. One may be tempted to purchase the weights with the tightest tolerances in order to reduce measurement uncertainty. Within the interior of the astj case is contained a polypropylene case to hold weights g and below with compartments for each weight. Troemner Calibration Weights are available in either one-piece or two-piece construction.
Physical characteristics shall be based on construction, design, surface area, materials, magnetism, density, surface finish, weight adjustment, and marking.
One-piece construction indicates the weight is manufactured from a single uniform piece of raw material, the weight has no other material added to it, and it has no method of adjustment other than removing material by grinding or polishing.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
Historical Version s – view previous versions of standard. Troemner supplies appropriate lifting devices such as forceps, gloves, and other lifting forks sufficient to handle every weight in the set. The cases are designed so that each weight will stay in its compartment.
We are a non-profit group that run this website to share documents. Weight specifications are designed so the specifications on surface finish, markings, construction, material density and magnetic properties get more restrictive as the weight tolerances get smaller in order to enable the weight to maintain its tolerance over time. Weight Class Weight Class 6. Maximum Permissible Errors 4.
NOTE 4—Materials adtm to make weights for special applications that do not fall within the density limits stated above, should have stated densities or density determinations performed.
As lower precision of measurement is required, so the range of density is broadened. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Class 2 weights can be used to calibrate asym instruments for important commercial transactions like gold and precious stones. One-piece weights are difficult to manufacture as the only method of final adjustment is removing material by polishing.
A number in parentheses indicates the year of last reapproval. At sea level f617 density of air may be assumed to be 1. These weights are constructed with one end turned up to allow for easy handling with forceps. Weights mg and lower are made of sheet metal and are one-piece construction with one side turned up to make aatm easy to handle with forceps.
This uncertainty contribution is applicable, sstm it is known from previous interchanging measurements with weights of the same nominal value. NOTE 2—Maximum Permissible Aatm for weights of denomination intermediate between those listed, the maximum permissible error shall be proportional to the values e167.
Link to Active This link will always route to the current Active version of the standard. For Classes 5, 6 and 7 the total surface areas should be minimized to the extent possible. Metrological traceability requires an established calibration hierarchy. The surface requirements shall be met at the end of the adjustment process.
For weights which have sealing caps, the cap may be made of aluminum. We need your help! However, protective cases in either wood or polypropylene are available for an extra charge. Class 0 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured. This may be interpreted as an eccentric loading error and the corresponding uncertainty should be estimated using Eq They should be used in extremely stable environments and handled with the highest level of care.
ASTM E – Free Download PDF
The letter R is aztm of the type of assessed profile, in this case R for roughness profile. This specification replaces National Bureau of Standards CircularSection 1, which is out of print.
When calibrating class00 and 0 weights, it is recommended to perform several test measurements at different times to ensure that there is enough information about the uncertainty at the time of the measurement. Weights mg and below are made of sheet metal and are one-piece construction with one side turned up to make them easy to handle with forceps. This unique material possesses low magnetic susceptibility, uniform consistency and high resistance to corrosion.
Last previous edition approved in as E — 97 Otherwise, due to their one-piece design, Class 0 weights will not maintain their measured value within the tolerance class.