International Comparison of Force Standards Between Korea Research Institute of Standards and Science (KRISS) and The National Metrology Institute of Japan (NMIJ)

摘要

An international comparison of force standards was conducted between Korea Research Institute of Standards andScience (KRISS) and the National Metrology Institute of Japan (NMIJ) in the National Institute of Advanced Industrial Science and Technology (AIST). The 100 kN deadweight force standard machine in KRISS was compared with 20 kN and 50 kN deadweight force standard machines in NMIJ. A 20 kN and a 50 kN force transfer standards were used for the intercomparison with the NMIJ 20 kN and 50 kN force machines respectively. A high-precision indicator, HBM DMP40, was used to read the values of force transfer standards. The time interval between measurements was decided carefully to minimize the creep effect. The output of force transducer was measured at four positions relative to the axis of the machine(0 deg, 90 deg, 180 deg, 270 deg) to reduce the effects of machine-transducer interaction. The relative deviation between KRISS 100 kN force machine and NMIJ 20 kN, 50 kN force machines were less than 1.6X10~(-5) and 1.0X10~(-5) respectively. The deviation was within the theoretical uncertainty of deadweight force machines.