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  • ASTM
    E898-88(2005) Standard Test Method of Testing Top-Loading, Direct-Reading Laboratory Scales and Balances
    Edition: 2005
    $82.37
    Unlimited Users per year

Description of ASTM-E898 2005

ASTM E898-88-Reapproved2005

Historical Standard: Standard Test Method of Testing Top-Loading, Direct-Reading Laboratory Scales and Balances




ASTM E898

Scope

1.1 This test method covers the determination of characteristics of top-loading, direct-reading laboratory scales and balances. Laboratory scales of the top-loading type may have capacities from a few grams up to several kilograms. Resolution may be from 1/1000 of capacity to 1/1 000 000 or more. This method can be used for any of these instruments and will serve to measure the most important characteristics that are of interest to the user. The characteristics to be measured include the following:

1.1.1 warm-up,

1.1.2 off center errors,

1.1.3 repeatability, reproducibility, and precision,

1.1.4 accuracy and linearity,

1.1.5 hysteresis,

1.1.6 settling time,

1.1.7 temperature effects,

1.1.8 vernier or micrometer calibration, and

1.1.9 resistance to external disturbances.

1.2 The types of scales that can be tested by this method are of stabilized pan design wherein the sample pan does not tilt out of a horizontal plane when the sample is placed anywhere on the pan surface. The pan is located generally above the measuring mechanism with no vertical obstruction, except for draft shields. Readings of weight may be obtained from an optical scale, from a digital display, or from a mechanical dial. Weighing mechanisms may be of the deflecting type, using gravity or a spring as the transducer, or may be a force-balance system wherein an electromagnetic, pneumatic, hydraulic, or other force is used to counterbalance the weight of the sample. Other force-measuring devices may be tested by this method as long as a sample placed on a receiving platform produces an indication that is substantially a linear function of the weight of the sample.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


Keywords

balances; direct reading; laboratory; scales; top-loading


ICS Code

ICS Number Code 17.100 (Measurement of force, weight and pressure)


DOI: 10.1520/E0898-88R05

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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