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An Interlaboratory Comparison of Multijunction Thermal Converters

Abstract: The results of an interlaboratory comparison (ILC) of Multijunction Thermal Converters (MJTCs) designed and fabricated by collaborators from the National Institute of Standards and Technology (NIST) and Sandia National Laboratories are reported at 0.5 V and 2 V over the frequency range from 10 Hz to 1 MHz. The ILC participants are laboratories that have these MJTCs, and include the three U.S. Department of Defense Primary Standards Laboratories and Sandia National Laboratories, with NIST serving as the pilot laboratory. The traveling standards and ILC protocol are described, along with the results of the ILC. The implications for the participating laboratories and the prospect of using this type of comparison in the NIST AC-DC Difference Calibration Service are also discussed. This ILC, the first ever of MJTCs outside of national metrology institutes (NMIs), was conducted in accordance with Recommended Practice RP-15, published by NCSLI International, and was completely successful in meeting the goals and outcomes of RP-15.