Terms Relating to Weighing

Glossary

Indicated amount

The nominal value (mass) of the weight indicated on Calibration Certificates with the JCCS logo mark. "XX" falls under this amount when indicating a weight in the format "Weight XX g".

Conventional mass

This is the calibrated value of the weight indicated on Calibration Certificates with the JCCS logo mark. To measure mass exactly, temperature, weight density, air density and other factors must be made clear. The conventional mass is a value based on hypothetical agreement on these parameters (temperature 20 °C, weight density 8000 kg/m3, air density 1.2 kg/m3).

Reproducibility (repeatability)

The capability to indicate the same mass value even if many times the same sample is weighed many times. Normally, it is indicated as standard deviation σ (sigma).

Minimum display (readout limit)

The minimum value by which weight can be read. On an electronic balance, this is the minimum step on the digital display.

Linearity

The extent that a weighing capacity value deviates from a straight line made by connecting the zero point and the weighing capacity (full capacity) point.

Specific weighing equipment (national certified equipment)

Weighing equipment used for transaction certification. Certification (stamp of certification) is required, and manufacturers are obligated to accept periodic inspection of their weighing equipment once every two years. With non-automatic balances (those that measure the mass of objects in a resting state), the scale interval must be 10 mg or more and the number of division indicators must be 100 or more, for example. Attention is required since this has been in use since before enforcement of the new Japanese Measurement Act in November 1993 and balances attached with proof of notification were treated as specific weighing equipment. However, this was an interim measure for a limited period of time, and these balances were no longer used for transaction evidence from October 31, 2001 onwards.

Weighing capacity

The maximum mass that can be measured by the balance.

Uncertainty

Uncertainty indicates an assessed range in which the true value for the measured value exists. This is indicated on Calibration Certificates with the JCCS logo mark, and allows the operator to objectively tell how much reliability the conventional mass has.

Resolution/internal resolution

The capability to distinguish differences in mass values in close proximity. It is expressed as "minimum display/weighing capacity". The smaller the value, the higher the resolution becomes. Internal resolution is the capability of distinguishing differences internally on the balance even if they are not indicated on the digital display. (On Shimadzu electronic balances, internal resolution is one-digit smaller than indicated resolution.)

Eccentric error (corner load error)

The difference between weighing values when the object to be weighed is placed in the center of the pan and measured and when it is placed at any other position and measured.

Scale interval

Difference in the amounts indicated by each of the adjacent division indicators (number, points or lines for indicating weighed values). Same as minimum value

For Research Use Only. Not for use in diagnostic procedures.

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