Note: Rapid offset reduction of impedance bridges taking into account instrumental damping and phase shifting | Zendy

C. M. van der Wel | Zendy; R. J. Kortschot | Zendy; I. A. Bakelaar | Zendy; Ben H. Erné | Zendy; Bonny W. M. Kuipers | Zendy

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Note: Rapid offset reduction of impedance bridges taking into account instrumental damping and phase shifting

Author(s) -

C. M. van der Wel,

R. J. Kortschot,

I. A. Bakelaar,

Ben H. Erné,

Bonny W. M. Kuipers

Publication year - 2013

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.4795554

Subject(s) - electrical impedance , offset (computer science) , input offset voltage , damping factor , voltage , amplifier , high impedance , sensitivity (control systems) , lock in amplifier , output impedance , control theory (sociology) , physics , materials science , acoustics , operational amplifier , computer science , input impedance , electronic engineering , optoelectronics , engineering , control (management) , cmos , quantum mechanics , artificial intelligence , programming language

The sensitivity of an imperfectly balanced impedance bridge is limited by the remaining offset voltage. Here, we present a procedure for offset reduction in impedance measurements using a lock-in amplifier, by applying a complex compensating voltage external to the bridge. This procedure takes into account instrumental damping and phase shifting, which generally occur at the high end of the operational frequency range. Measurements demonstrate that the output of the circuit rapidly converges to the instrumentally limited noise at any frequency.

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