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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Corners and edges are smooth. Originally approved in Sheet metal weights mg and below are always one-piece construction.
This abstract is a brief summary of the referenced standard. 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. Negative corrections indicate that the weight embodies less mass than awtm indicated by the assigned nominal value.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
Please help us to share our service with your friends. However, protective cases in either wood or polypropylene are available for an extra charge. This may be interpreted as an eccentric loading error and the corresponding uncertainty should be estimated using Eq The magnetization of a body generates an inhomogeneous magnetic field in space and thus may produce ashm forces on other materials.
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. Sstm will lead to linear summation of uncertainties: There is a cavity below the knob thread in the body which asm adjusting material, typically the same material from which the weight is made.
Permission rights to photocopy the standard may also be secured from the ASTM website www.
ASTM E – 97() Standard Specification for Laboratory Weights And Precision Mass Standards
Other cylindrical class 6 and 7 weights of 5 kg or greater shall be made of grey cast iron or of another material whose brittleness and resistance to corrosion is similar or better than that of grey cast 5. In most cases, the uncertainty contribution uE is already covered by the uncertainty uw of the weighing process and may be neglected. Elements for confirming metrological traceability to be an unbroken chain ast 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 asttm the SI, and established calibration intervals see current VIM: The outer diameter, top and bottom surface roughness must meet Table 6.
Troemner Calibration Weights 1 g and larger consist of a body and a lifting knob. The acceptable maximum values for user markings are given in Table 7. Markings shall not perforate or crack sheet metal weights.
Thank you for interesting in our services. For weights which have sealing caps, the cap may be made of aluminum. We need your help to maintenance this website.
Weight Class Weight Class 6. Its uncertainty is estimated from the uncertainties for temperature, pressure and air humidity. Periods shall not be used with abbreviations in marking weights. They can also be used to calibrate Class 3 weights. Metrological traceability requires an established calibration hierarchy.
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 these classes of weights, if the standard deviation of mass difference measurements is not known from historical data, it can be estimated as: This is an upper limit for the uncertainty.
Class 0 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Nominal value of weights mg and below are determined by their shape as listed in the table below: Otherwise, due to their one-piece design, Class 0 weights will not maintain their measured value within the tolerance class.
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. Cast iron cannot have a susceptibility specification of any real value.
The back-up spacer should be of a similar material as the weight. Class 1 weights can also be used to calibrate Class 2 weights.
They should be used in extremely stable environments and handled with the highest level of care. NOTE 4—Materials used to make weights for special applications that do not fall within the density limits stated above, should have stated densities or density determinations performed. Troemner Calibration Weights are available in either one-piece or two-piece construction. The body of the weight is one piece and the knob of the weight is the second piece.
For weights larger than g, a velvet lined compartment for each weight exists within the wood case. 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.