Eliminating the Effect of Probe-to-Probe Coupling in Inductive Coupling Method for In-Circuit Impedance Measurement

In-Circuit Impedance Measurement Setups of Inductive Coupling Approach: A Review

“…Fig. 2(b) shows its three-port network (3PN) equivalent circuit [15]. Compared with C2PN equivalent circuit, the 3PN equivalent circuit considers the influence of probe-to-probe coupling between the two inductive probes.…”

A Survey of Impedance Measurement Methods in Power Electronics

“…Channel 1 (CH1) and channel 2 (CH2) of the signal acquisition card (SAC) of SGAS are used to sample the time-domain voltages at the input of the IIP (𝑽 𝐂𝐇𝟏 ) and the output of the RIP (𝑽 𝐂𝐇𝟐 ), respectively. Unlike the frequency-domain TPS that uses the cascaded two-port network theory, a three-port network theory is used for the time-domain TPS to evaluate the influence of the probe-to-probe coupling from the two inductive probes [55]. The probe-to-probe coupling could result in potential effects on the measurement accuracy of the TPS when the two inductive probes are very close to each other due to space constraints.…”

Two-Probe Setup with Improved Calibration for Online Impedance Measurement of Electrical Assets

“…Among the fore mentioned, the latter approach is a preferred method as it has zero physical contact to the live electrical system under test (SUT). Additionally, the clamp-on inductive probes utilised in this method can simply be secured and detached from the insulated cable that transmits power to the SUT which notably simplifies the implementation with minimal electrical risk [7].…”

“…The prevailing inductive coupling setup adopts two probes in total: an injecting inductive probe (IIP) and a receiving inductive probe (RIP), which is also known as the Two-Probe Measurement Setup (TPMS). An open/short/load (OSL) calibration procedure is implemented to eradicate any possible ramifications of the probeto-probe coupling [7], however, based on the assumption that the calibration criterions (shorted, open and 50Ω) are approximated to their theoretical values in a specified frequency range. Hence, any measurement with frequency outside the specified range (i.e.…”

“…The impedance contributed by the source voltage and electrical wirings excluding the sections that are being clamped by the probes of the measurement setup is denoted as ZS and ZW respectively, as shown in Figure8[25]. The equivalent impedance measured by the two probes can be represented by ZX, where 𝒁 𝑿 = 𝒁 𝑺 + 𝒁 𝑾 + 𝒁 𝑫𝑼𝑻(7)…”