TITLE

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

AUTHOR(S)
van der Wel, C. M.; Kortschot, R. J.; Bakelaar, I. A.; Erné, B. H.; Kuipers, B. W. M.
PUB. DATE
March 2013
SOURCE
Review of Scientific Instruments;Mar2013, Vol. 84 Issue 3, p036109
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
86446721

 

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