AC resistance bridge based on the cryogenic current comparator

H. Seppä, A. Satrapinski

    Research output: Contribution to journalArticleScientificpeer-review

    19 Citations (Scopus)


    This paper describes a low-frequency ac resistance bridge based on a Cryogenic Current Comparator (CCC). The bridge is a main tool for resistance traceability of 10 kO, 100 O, and 1 O to the quantum Hall resistance (QHR). The bridge is typically operated with a PC generating a sinusoidal ac signal ranging from (0.1 to 2) Hz. Using a vector analyzer as a signal source the bridge is used to 1 kHz. Both sinusoidal and pseudo random signals have been used to compare the frequency dependence of standard resistors against the QHR. At present the bridge can be used to perform accurate calibrations to 10 Hz, at higher frequencies the self-resonance of the CCC increases the uncertainty.
    Original languageEnglish
    Pages (from-to)463-466
    JournalIEEE Transactions on Instrumentation and Measurement
    Issue number2
    Publication statusPublished - 2002
    MoE publication typeA1 Journal article-refereed


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