• Vaiseshika Electron Device

Proving Rings

Proving Rings provide excellent primary and secondary calibration standards for the calibration and measurement of force parameters up to 1,00,000 pound of force. These rings possess extremely low uncertainty and high-resolution capability. Morehouse proving rings are manufactured according to the designed specification originally established by the NIST, U.S.A. The rings are calibrated according to the stringent and exacting standards of ASTM. They are based on the principle of the steel load ring to assure maximum reliability through years of use. A steel ring of the proper alloy, carefully forged and machined, will perform as a near-perfect elastic member. When forces are applied to the ring, its diameter changes according to the load. The load applied can be determined by a precise measurement of the change in diameter. The ultimate uncertainty of a ring-type instrument depends on the precision of the apparatus, which measures the extent of ring diameter change when loads are applied. In each Morehouse instrument the measuring apparatus designed into it performs consistently within related limits. Further to facilitate calibration, proving rings are equipped with an electrical reed vibrator, a dial revolution counter, a vernier index, a carbide micrometer contact to minimize wear and a ball seat in the top boss.