2026-04-14T02:53:00Zhttps://recercat.cat/oai/requestoai:recercat.cat:2117/13922025-07-17T02:27:59Zcom_2072_1033col_2072_452950
Compensation of impedance meters when using an external front-end amplifier
Torrents Dolz, Josep M.
Pallàs-Areny, Ramon
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
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)
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.
Peer Reviewed
2002-04-30
Article
Torrents, JM; Pallàs-Areny, R. Compensation of impedance meters when using an external front-end amplifier. IEEE Transactions on Instrumentation and Measurement. 2002, vol.51 núm.2, p.310-313
0018-9456
https://hdl.handle.net/2117/1392
eng
CICYT TAP1999-0742
Open Access
310-313
application/pdf
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC