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.^[1]

A mass used to calibrate a weighing scale is sometimes called a calibration mass or calibration weight.

A proof mass that deforms a spring in an accelerometer is sometimes called the seismic mass.^[2] In a convective accelerometer, a fluid proof mass may be employed.^[3]

See also

• Calibration, checking or adjustment by comparison with a standard
• Control variable, the experimental element that is constant and unchanged throughout a scientific investigation
• Test particle, an idealized model of an object in which all physical properties are assumed to be negligible, except for the property being studied