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*.
|Published (Last):||9 October 2010|
|PDF File Size:||6.40 Mb|
|ePub File Size:||11.61 Mb|
|Price:||Free* [*Free Regsitration Required]|
The acceptable maximum values for user markings are given in Table 7.
For weights of higher precision, the range of density is atsm to values at or near the density of well-established standards, such as are used by primary calibration laboratories. These maximum permissible errors apply to conventional mass values.
Other cylindrical class 6 and 7 weights of 5 kg or greater shall be made of grey asfm iron or of another material whose brittleness and resistance to corrosion is similar or better than that of grey cast 5.
Sheet metal weights or wire weights astn be used below 1 g. For Class and 00 the manufacturer shall provide a measured value for the density of the weights. 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 see current VIM: Metrological and Technical Requirements 2.
Corners and edges are smooth. The assessed profile of a sample can be in terms of different profile types: Please see the Tolerance Chart within the Mass Standards Handbook for the specific tolerances of each weight in any given class.
Troemner weight sets where the largest weight is g and lower are supplied in attractive, durable polypropylene cases with a compartment for each weight asttm the case. Minimum requirements for the number of weighing cycles are in Table This specification replaces National Bureau of Standards CircularSection 1, which is out of print.
All weights shall be free of ragged or sharp edges or ends. We are a non-profit group that run this website to share documents.
JCGM and supplements. This is an upper limit for the uncertainty. Weights to be used with 8 Download From http: There is also a compartment for forceps. 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. 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.
Both sheet metal and wire weights shall be free of cracks such as may be formed from bending. A number in parentheses indicates the year of last reapproval. Class 4 weights can be used for calibration of semi-analytical balances and for student use. 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.
If the weights satisfy the requirements of this standard, the uncertainty due to magnetism, uma, may be assumed to be zero.
They should be used in extremely stable environments and handled with the highest level of care. A precise measurement of density can only be made for one-piece weights. The outer diameter, top and bottom surface roughness must meet Table 6. Originally approved in The magnetization of a body generates an inhomogeneous magnetic field in space and thus may produce magnetic forces on other materials.
For reference standards, stability and information about e61 values of the weights is ast important than the closeness of the values to nominal. This coating shall withstand shocks and outdoor weather conditions. This may be interpreted as an eccentric loading error and the corresponding uncertainty should be estimated using Eq 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.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
United States Download From http: One-piece weights are difficult to manufacture as the only method of final adjustment is removing material by polishing. The surface of the weights may be treated with a suitable coating in order to improve their corrosion resistance. 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.
From the context it is usually clear in which sense the term is used. As lower atm of measurement is required, so the range of density is broadened. Adjusting material and back-up disc must meet the magnetic requirements specified for the accuracy class of the weight.
Class 0 weights 1 g and larger are of one-piece construction using Troemner Alloy 8 Stainless Steel, which has a consistent density. Nominal value of weights mg and below are determined by their shape as listed in the table below: Cast iron cannot have a susceptibility specification of any real value. Class 0 weights are intended to be used in metrology laboratories where the awtm of the environment and careful handling are assured.
One may be tempted to purchase the weights with the tightest tolerances in order to reduce measurement uncertainty. H and M are vectors; z is the vertical cartesian coordinate.
ASTM E – 97() Standard Specification for Laboratory Weights And Precision Mass Standards
Link to Active This link will always route to the current Active version of the standard. Class 2 weights can be used to calibrate weighing instruments s617 important commercial transactions like gold and precious stones. Your comments are invited either for revision of this standard s617 for additional standards and should be addressed to ASTM International Headquarters.
In cases when the interchange is performed during a calibration procedure, the average of the two indication differences shall be taken as the weighing result and uE can be neglected.