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Title:
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Compensation of impedance meters when using an external front-end amplifier
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Author:
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Torrents Dolz, Josep M.; Pallàs Areny, Ramon
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica; Universitat Politècnica de Catalunya. GRUP ISI - Grup d'Instrumentació, Sensors i Interfícies |
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Abstract:
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Four-terminal impedance meters based on
pseudo-bridges yield unexpected uncertainties when using high-contact-impedance electrodes. Adding a front-end amplifier to the impedance meter and rearranging the connection of the meter terminals overcome the contact impedance problem. However, because the compensation provisions in the instrument are meant to compensate only impedance residuals of test fixtures, by either an open/short or an open/short/load correction procedure,
the external front-end increases the inaccuracy of the measurement setup. This paper shows that an open/short/load correction can also compensate complicated impedance residuals such as those from external amplifiers. The paper details the correction procedure and provides the equations to calculate the impedance
under test from the readings of the impedance meter. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica
-Impedance (Electricity)
-Amplifiers (Electronics)
-Amplifiers
-Bridge instruments
-Compensation
-Electric impedance measurement
-Impedance meter
-External front-end amplifier
-Electrode contact impedance
-Residual impedance
-Open/short/load/ correction
-Pseudo-bridge instrument
-Impedància (Electricitat)
-Amplificadors (Electrònica) |
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Rights:
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Document type:
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Article |
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Published by:
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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