Evaluation of NMIJ Traveling Dual Source Bridge Using NIST Adapted Wheatstone Bridge

DC high resistance measurement capability between the National Institute of Standards and Technology (NIST) and the National Metrology Institute of Japan (NMIJ) has been evaluated using a NMIJ traveling dual source bridge. The NMIJ bridge determines the resistance ratio by measuring the voltage ratio using an 8.5 digit digital multimeter. Based on the same 1 MΩ standard resistor calibrated using a 2-terminal cryogenic current comparator, standard resistors from 10 MΩ to 10 GΩ were calibrated by 10:1 scaling measurements with both systems. The measurements at 10 GΩ agreed to less than 1 μΩ/Ω for both systems. Scaling from 10 GΩ to 100 TΩ is in progress.