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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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. In cases when the interchange is performed during a calibration procedure, the average of the e61 indication differences shall be asmt as the weighing result and uE can be neglected.
Maximum permissible error, magnetic property, density, and surface roughness for each weight shall be within the limits indicated in this specification. One may asttm tempted to purchase the weights with the tightest tolerances in order to reduce measurement uncertainty. 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.
Class 0 weights 1 g and larger are f617 one-piece construction using Troemner Alloy 8 Stainless Steel, which has a consistent density. Link to Active This link will always route to the current Active version of the standard. They should be used in extremely stable environments and handled with the highest level of care.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
The Sheet Metal Weights come standard with the weight products. A number in parentheses indicates the year of last reapproval.
Weight Class Weight Class 6. The back-up spacer should be of a similar material as the weight. One-piece weights are difficult to manufacture as the only method of final adjustment is removing material by polishing. 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by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. This abstract is a brief summary of the referenced standard.
Troemner Calibration Weights 1 g and larger consist of a body and a lifting knob.
Troemner Calibration Weights are available in either one-piece or two-piece construction. Only the numerical portion of the weight value needs to be on the surface of weights.
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 sstm primary calibration laboratories. If it can be assumed that the type B uncertainty estimates are conservative with infinite degrees of freedom, the formula has the form: The magnetization of a body generates an inhomogeneous magnetic field in space and thus may produce magnetic forces on other materials.
These aastm are constructed with one end turned up to allow for easy handling with forceps.
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.
Two-piece construction means the weight is made of multiple pieces of raw material. This coating shall withstand shocks and outdoor weather ee617. If magnetic effects are negligible, i. The lifting knob is specifically designed for use with forceps, tweezers or some other lifting device.
ASTM E – Free Download PDF
Originally approved in This specification replaces National Bureau of Standards CircularSection 1, which is out of print. Elements for confirming metrological traceability to be an unbroken chain to an international measurement ast or a national measurement standard IPK or NPSshall include a documented measurement uncertainty, a documented measurement procedure, xstm technical competence, metrological traceability to the SI, and established calibration intervals see current VIM: The shape of weights smaller than 1 mg shall be discussed and verified with the customer.
Sheet metal weights mg and below are always one-piece construction. Metrological traceability requires an established calibration hierarchy.
Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. A larger uncertainty cannot be arbitrarily chosen. This uncertainty contribution is applicable, if it is known from previous interchanging measurements with weights of the same nominal value.
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. Size px x x x x The surface requirements shall be met at the end of the adjustment aetm. The body of the weight is one piece and the knob of the weight is the second piece.
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. There is also a compartment for forceps.
ASTM E – 97() Standard Specification for Laboratory Weights And Precision Mass Standards
The assessed profile of a sample can be in terms of different profile types: Metrological and Technical Requirements 2. If the sensitivity is not constant with time, temperature and load, its variation must be included in the uncertainty.
D617 0 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured. 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.