Establishing Reliability in Vibration Measurement and Its International Equivalency

The metric system and primary national metrology standards are necessary, but not sufficient for obtaining measurement equivalency. Recently, national metrology institutes of various countries including NMIJ/AIST of Japan are participating in international comparisons to confirm equivalency of their measurement capabilities, under a mutual recognition of arrangement (MRA). In this report, we describe progress on improving vibration measurement at NMIJ/AIST, along with global activities for establishing MRA. We also discuss future issues for improving vibration measurements.