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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ASTM E – 18 Standard Specification for Laboratory Weights and Precision Mass Standards
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by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. Class 0 weights 1 g and larger are of one-piece construction using Troemner Alloy 8 Stainless Aatm, which has a consistent density.

Two-piece construction means the weight is made of multiple pieces of raw material. Cast iron cannot have a susceptibility specification of any real value. Troemner individual weights are not supplied in cases. 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. Please help us to share our service with your friends.
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. This will lead to linear summation of uncertainties: These handcrafted cases feature a fine wood zstm 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.
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. This abstract is a brief summary of the referenced standard. Adjusting material and back-up disc must meet the magnetic requirements specified for the accuracy class of the weight. For these classes of weights, if the atm deviation of mass difference measurements is not known from historical data, it can be estimated as: 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.
It is informational only and not an official part of the standard; the full text e61 the standard itself must be referred to for its use and application.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Metrological and Technical Requirements 2.
Troemner UltraClass weights can also be used to calibrate Class 1 weights. 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.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
Troemner weight sets, astn the largest weight is g and larger are supplied in handcrafted wood cases. Elements for confirming metrological traceability to be an unbroken chain to an international measurement standard or a national measurement standard IPK or NPSshall include a documented measurement uncertainty, a documented measurement procedure, accredited technical competence, metrological traceability to the SI, and established calibration intervals astj current VIM: 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.
United States Download From http: This specification replaces National Bureau of Standards CircularSection 1, which is out of print. Milligram Wire Weights – Troemner Calibration Weights mg and below are also available in wire construction as opposed to sheet metal with the shape denoting the nominal value as listed in the following table.
Weight bottoms are slightly recessed to expose the smallest possible area to wear. Historical Version s – view previous versions e6177 standard. Physical characteristics shall be based on construction, design, surface area, materials, magnetism, density, surface finish, weight adjustment, and marking.
For weights which have sealing caps, the cap may be made of aluminum.
In most cases, the uncertainty contribution uE is already covered by the uncertainty uw of the weighing process and may be neglected. 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. This uncertainty contribution is applicable, if it is known from previous interchanging measurements with weights of the same nominal value.
At sea level the density of air may be assumed to be 1. The body of the weight is one piece and the knob of the weight is the second piece. They must be specified when weights are to be used as standards for the calibration of weights of Classes00, 0, 1, 2 and 3, and where maximum stability is required.
Asrm reference standards, stability and information about the values of the weights is more important atsm the closeness of the values to nominal. Sheet metal weights or wire weights may be used below 1 g.
Within the interior of the wood case is contained a polypropylene case to hold weights g and below with compartments for each weight. The letter R is indicative of the type of assessed profile, in this case R for roughness profile.
This specification covers laboratory weights and precision mass standards including their principal physical characteristics and metrological requirements.

Class 0 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured. For Classes 5, 6 and 7 the total surface areas should be minimized to the extent possible. Referenced Documents purchase separately The adtm listed below are referenced within the subject standard but are not provided as part of the standard. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Please copy and paste this embed script to where you want to embed Embed Script. 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.
