The four terminal-pair definition of standards allows to reach ultimate accuracy in impedance metrology. The four terminal-pair definition requires dedicated circuitry to be included in the bridge network, and the reach of auxiliary bridge balances during the measurement. A careful choice of the network topology allows the bridge to be self-compensating: the four terminal-pair definition is in large part achieved by the behaviour of the network itself, without any adjustment. The additional circuitry required for impedance definition can therefore be simpler, the balancing procedure becomes easier, and a more robust four terminal-pair definition is achieved. This paper analyses a current comparator bridge network with a topology featuring self-compensation. A digitally-assisted test implementation was realized; test measurements on ac resistance comparison in the 25Ω to 100Ω range, at kHz frequency, are reported.

Self-compensating networks for four terminal-pair impedance definition in current comparator bridges / Callegaro, Luca; D'Elia, V; Pourdanesh, F; Trinchera, BRUNO OTTAVIO; Kucera, J; Ortolano, M.. - (2015), pp. 1658-1661. (Intervento presentato al convegno 2015 IEEE International Instrumentation and Measurement Technology Conference tenutosi a Pisa, Italy nel May 11-14).

Self-compensating networks for four terminal-pair impedance definition in current comparator bridges

CALLEGARO, LUCA;TRINCHERA, BRUNO OTTAVIO;
2015

Abstract

The four terminal-pair definition of standards allows to reach ultimate accuracy in impedance metrology. The four terminal-pair definition requires dedicated circuitry to be included in the bridge network, and the reach of auxiliary bridge balances during the measurement. A careful choice of the network topology allows the bridge to be self-compensating: the four terminal-pair definition is in large part achieved by the behaviour of the network itself, without any adjustment. The additional circuitry required for impedance definition can therefore be simpler, the balancing procedure becomes easier, and a more robust four terminal-pair definition is achieved. This paper analyses a current comparator bridge network with a topology featuring self-compensation. A digitally-assisted test implementation was realized; test measurements on ac resistance comparison in the 25Ω to 100Ω range, at kHz frequency, are reported.
2015
2015 IEEE International Instrumentation and Measurement Technology Conference
May 11-14
Pisa, Italy
none
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/30888
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 1
social impact