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proof mass
A proof mass or test mass is a known quantity of mass used in a measuring instrument as a reference for the measurement of an unknown quantity.
A proof mass that deforms a spring in an accelerometer is sometimes called the ''seismic mass''.
A mass used to calibrate a weighing scale is sometimes called a ''calibration mass'' or ''calibration weight''.
==See also==
* Test particle, an idealized model of an object whose physical properties (mass, charge, size, etc.) are assumed to be negligible except for the property being studied
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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