Dead-weight Tester

A type of instrument Calibration Equipment.

A device used to produce an accurate amount of pressure to calibrate pressure-measuring instruments. Oil pressure built up in the tester is applied to a cylinder fitted with a free-floating piston. This piston has an accurately known area and is loaded with an accurately known weight. The amount of pressure needed to raise the piston is found by dividing the weight being lifted by the area of the piston. This pressure is applied to the gage being calibrated, and the gage is adjusted to read this amount.