A Study on the Thermal Hysteresis of Traveling Inductance Standards
Luca Callegaro, Vincenzo D’Elia, Martina Marzano, Massimo Ortolano, M. Florian Beug, Harald Bothe · IEEE Transactions on Instrumentation and Measurement · 2025
The international equivalence of measurement standards and of the calibration and measurement capabilities of National Metrology Institutes is demonstrated through international intercomparisons. The comparison CCEM-K3.2018 “Inductance at 10 mH and 1 kHz” is under preparation. To verify the uncertainty claims of the participant institutes, traveling standards of an unprecedented level of stability are required. INRIM and PTB characterized several General Radio (GenRad) 1482 inductance standards versus large temperature steps that may occur during air carrier transportation. This work reports on the thermal hysteresis manifested by these standards, which may impact on the uncertainty of the reference value of the CCEM-K3 and other future international and interlaboratory comparisons.