Mr. Chuttipong Tuma, from NIMT, conducted a research visit to the National Metrology Institute of Japan (NMIJ), AIST, from 1\u201320 June 2025. The visit focused on advancing technical knowledge in AC-DC transfer difference calibration systems, particularly the step-up and step-down calibration procedures and the design of Resistive Voltage Dividers (RVDs) used in high-accuracy electrical metrology.<\/p>\n
During the visit, Mr. Tuma studied NMIJ’s primary calibration systems for AC-DC transfer standards and observed how traceability is established across a wide voltage range using step-up and step-down techniques. He also gained practical knowledge of RVD design, compensation methods, and calibration procedures for Thermal Transfer Standards (TTS), which are essential for achieving high-precision AC voltage measurements.<\/p>\n
In addition to laboratory activities, technical discussions with NMIJ experts provided valuable insights into the development of national traceability systems and the application of advanced calibration methodologies across low-, medium-, and high-frequency ranges. The visit also highlighted the growing role of Quantum Metrology, including technologies such as Programmable Josephson Voltage Standards (PJVS) and Josephson Arbitrary Waveform Synthesizers (JAWS), in establishing next-generation electrical standards.<\/p>\n
The knowledge and experience gained from this research visit will contribute to strengthening NIMT’s capabilities in AC-DC voltage metrology, supporting the development of national primary standards, and enhancing Thailand’s measurement traceability infrastructure. The collaboration also reinforces the long-standing technical partnership between NIMT and NMIJ, promoting future cooperation in electrical metrology research and innovation.<\/p>\n\n\t\t