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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At sea level the density of air may be assumed to be 1. For reference standards, stability and information about the values of the weights is more important than the closeness of the values to nominal.
There are no markings indicating nominal value on any Class 0 weights.
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.
Class 0 weights mg and lower are e67 of sheet metal and are one-piece construction with one side turned up to make them easy to handle with forceps.
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 e61 negligible.
Abbreviations are shown in Appendix X2. JCGM and supplements. Work Item s – proposed revisions of this standard.
ASTM E – 18 Standard Specification for Laboratory Weights and Precision Mass Standards
The magnetization of a body generates an inhomogeneous magnetic field in space and thus may produce magnetic forces on other materials. Weight Class Weight Class 6. This uncertainty contribution is applicable, if it is known from previous interchanging measurements with weights of the same nominal value.
Please fill this form, we will try to respond as soon as possible. If it can be assumed that the type B uncertainty estimates are conservative with infinite degrees of e167, the formula has the form: 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. Permission rights to photocopy the standard may also be secured from the ASTM website www.
ASTM E – Free Download PDF
Troemner Calibration Weights 1 g and larger consist of a body and a lifting knob. Minimum requirements for the number of weighing cycles are f617 Table Weights mg and lower are made of sheet metal and are one-piece construction with one side turned up to make them easy astmm handle with forceps.
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. From the context atsm is usually clear in which sense the term is used.
The lifting knob is specifically designed for use with forceps, tweezers or some other lifting device. We are a non-profit group that run this website to share documents. Class 4 weights can be used for calibration of semi-analytical balances and for student use. Please see the Tolerance Chart within the Mass Standards Handbook for the specific tolerances of each weight in any given class.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
The unit of mass is the kilogram. Maximum permissible error, magnetic property, density, and surface roughness for each weight shall be within the limits indicated in this e6617. This coating shall withstand shocks and outdoor weather conditions.
Maximum Permissible Errors 4. Metrological traceability requires an established calibration hierarchy. It is informational only and aztm an official part of the standard; the full text of the standard itself must be referred to for its use and application.
For these classes of weights, if the standard deviation of mass difference measurements is not known from historical data, it can be estimated as: Negative corrections indicate that the weight embodies less mass than is indicated by the assigned nominal value.
H and M are vectors; z is the vertical cartesian coordinate. Depending on the class, these weights may or may not be marked astj their nominal value.
The shape asgm weights smaller than 1 mg shall be discussed and verified with the customer. Troemner UltraClass weights can also be used to calibrate Class 1 weights. Weights to be used with 8 Download From http: 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.
Periods shall not be used qstm abbreviations in marking weights. The cases are designed so that each weight will stay in its compartment. These weights are constructed with one end turned up to allow for easy handling with forceps.