Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 70, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2020.3013688
Keywords
Electrical system; in-circuit impedance measurement; inductive coupling method; open-short-load (OSL) calibration; probe-to-probe coupling
Funding
- SMRT-NTU Smart Urban Rail Corporate Laboratory
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This article investigates possible errors in measuring in-circuit impedance due to probe-to-probe coupling in the inductive coupling approach, and proposes a calibration technique and measurement process to minimize the errors.
The in-circuit impedance serves as a key parameter for evaluating the operating status and health condition of many critical electrical assets. For its noncontact nature and simplicity in on-site implementation, the inductive coupling approach is an attractive method to extract the in-circuit impedance of an electrical system. In some practical situations where there are space constraints, the inductive probes used in this approach are very close to each other and the probe-to-probe coupling between inductive probes cannot be ignored. This article investigates possible errors due to such coupling and proposes an open-short-load calibration technique and a proper measurement process to minimize the error in the measured in-circuit impedance.
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