Recent Improvements in SUT and METAS 4TP Sampling-Based Digital Impedance Bridges

This paper describes hardware and software improvements of the SUT and METAS four-terminal-pair (4TP) sampling-based digital impedance bridges. These improvements are based on the use of a new dual output coaxial multiplexer and modified software controlling the bridge and procedure of complex voltage ratio measurement. The new setup provides an improved accuracy of impedance measurements due to good symmetry of the circuit and averaging results coming from two digitizers.