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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This specification replaces National Bureau of Standards CircularSection 1, which is out of print. In any case the unit shall not be included where such marking would be illegible. 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. Weight bottoms are slightly recessed to expose the smallest possible area to wear. The assessed profile of a sample can be in terms of different profile types: These handcrafted cases feature a fine wood exterior with an interior compartment that is either fully lined with padded velvet or velour for the given weight or the case has a foam interior.
Metrological and Technical Requirements 2. Its uncertainty is estimated from the uncertainties for temperature, pressure and air humidity.
Zstm rights to photocopy the standard may also be secured from the ASTM website www. Current edition approved May 1, In the case of sets of non-metric weights, at least the largest weight of a particular set should be marked with the unit name or abbreviation.
The nominal value of each weight is etched or stamped on the top surface of the weight and their shape is square. Troemner Calibration Weights 1 g and larger consist of a body and 6e17 lifting knob. Nominal value of weights mg and below are determined by their shape as listed in the table below: Originally approved in If the sensitivity is not constant with time, temperature and load, satm variation must be included in the uncertainty.
Other cylindrical class 6 and 7 weights of 5 kg or greater shall be made of grey cast iron or of another material whose brittleness and resistance to corrosion is similar or better than that of grey cast 5.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
However, frequency of use, care, handling and environmental conditions all play a major role in the long term stability of weights and these factors should be considered before purchasing Class 0 weights. All weights shall be free of ragged or sharp edges or ends.
For Classes 5, 6 and 7 the total surface areas should be minimized to the extent possible. This is an upper limit for the uncertainty. The mass of the weight is the assigned nominal value plus the assigned correction.
ASTM E – 97() Standard Specification for Laboratory Weights And Precision Mass Standards
A larger uncertainty cannot be arbitrarily chosen. Class 3 weights can be used for calibrating balances with moderate precision, with a readability as low as 0. For weights larger than g, a velvet lined compartment for each weight exists within the wood case.
We need your help to maintenance this website. Positive corrections indicate that the weight embodies more mass than is indicated by the assigned nominal value. Troemner supplies appropriate lifting devices such as forceps, gloves, and other lifting forks sufficient to handle every weight in the set.
Class 0 weights 1 g and larger are of one-piece construction using Troemner Alloy 8 Stainless Steel, atsm has a consistent density. Although very stable, one-piece construction Class 0 weights have no method of adjustment and are not suitable for general laboratory use.
ASTM E – Free Download PDF
Physical characteristics shall be based on construction, design, surface area, materials, magnetism, asfm, surface finish, weight adjustment, and marking. Vertical component of the magnetic interaction between the weight and the balance or the environment, or both. 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. The magnetization of a body generates an inhomogeneous magnetic field in space and thus may produce magnetic forces on other atsm.
s617 We are a non-profit group that run this website to share documents. Please help us to share our service with your friends. Last previous edition approved in as E — 97