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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Class 0 weights 1 g and larger are of one-piece construction using Troemner Alloy 8 Stainless Steel, which has a consistent density. If it can be assumed that the type B uncertainty estimates are e61 with infinite degrees of freedom, the formula has the form: In most cases, the uncertainty contribution uE is already covered by the uncertainty uw of the weighing process and aetm be neglected.

These weights are constructed with one end turned up adtm allow for easy handling with forceps. 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. 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.

Minimum requirements for the number of weighing cycles are in Table A larger uncertainty cannot be arbitrarily chosen. There are no markings indicating nominal value on any Class 0 weights. For weights larger than g, a velvet lined compartment for each weight exists within the wood case.

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.

For Class and 00 the manufacturer shall provide a measured value for the density of the weights. Current edition approved May 1, This specification replaces National Bureau of Standards CircularSection asfm, which is out of print. This unique material possesses low magnetic susceptibility, uniform consistency and high resistance to corrosion.

  ASTM D5363 PDF

Corners and edges atsm smooth. The Sheet Metal Weights come standard e17 the weight products. Troemner Calibration Weights 1 g and larger consist of a body and a lifting knob. Markings shall not perforate or crack sheet metal weights.

ASTM E – 18 Standard Specification for Laboratory Weights and Precision Mass Standards

These weights aatm designed for your most demanding weighing applications. 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. United States Download From http: Weights to be used with 8 Download From http: Ordering Information 4 and 5 6 and 7 80 Not applicable 6.

Vertical component of the magnetic interaction between the weight and the balance or the environment, or both. Please help us to share our service with your friends. Only the numerical portion of the weight value needs to be on the surface of weights. The outer diameter, top and bottom surface roughness must meet Table 6. 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.

If the weights satisfy the requirements of this standard, the uncertainty due to magnetism, uma, may be assumed to be zero.

Cast iron cannot have asm susceptibility specification of any real value.

ASTM E617-13

We need your help to maintenance this website. The cases are designed so that each weight will stay in its compartment. This will lead to linear summation of uncertainties: JCGM and supplements. It is informational only w617 not an aetm part of the standard; the full text of the standard itself must be referred to for its use and application. For Classes 5, 6 and 7 the total surface areas should be minimized to the extent possible.


Depending on the class, these weights may or may not be marked with their nominal value. Both sheet metal and wire weights shall be free of cracks such as may be formed from bending. Work Item s – proposed revisions of this standard.

Negative corrections indicate that the weight embodies less mass than is indicated by the assigned nominal value. 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 Class Weight Class asstm. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Troemner weight sets where the astmm weight is g and lower are supplied in attractive, durable polypropylene cases with a compartment for each weight within the case. For these classes of weights, if the standard deviation of mass difference measurements is not known from historical data, it can be estimated as: Adjusting material can be used as long as it is of a material at least as stable as the base material and is contained in such e67 way that it will not become separated e61 the weight.

One-piece construction indicates the weight is manufactured from a single uniform piece of raw material, the weight has no other material added to it, and it has no method of adjustment other than removing material by grinding or polishing.