Multicore Cable Testing via Phase-Inverted Capacitive Coupling
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Solution Overview
Problem
Testing multicore cables with densely arranged insulated wires faces challenges in accurately identifying correspondence relationships due to increased crosstalk when using AC test signals without contact, making it difficult to connect the wires correctly to connectors or circuit boards.
Innovation Solution
A method involving capacitive coupling, where a test signal and a phase-inverted test signal are input to the insulated wires, allowing for the measurement of output voltages to accurately identify the correspondence relationship between the ends of the wires, reducing crosstalk and enabling efficient connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If AC test signal is input without contact using capacitive coupling, then test speed is improved and direct contact is avoided, but crosstalk between densely arranged insulated wires increases
Solution Approach 1:
The patent applies preliminary anti-action by inputting a phase-inverted test signal to adjacent insulated wires before measuring the target wire. This pre-applied opposite-phase signal counteracts the crosstalk interference that would otherwise be induced in the target wire during capacitive coupling testing, enabling accurate measurement while maintaining non-contact testing speed
Solution Approach 2:
The patent converts the harmful crosstalk effect into a beneficial measurement mechanism. By deliberately inputting phase-inverted signals to adjacent wires, the crosstalk that would normally corrupt the measurement is transformed into a controlled interference pattern that, when combined with the target signal, enables identification of the correspondence relationship through voltage measurement
2Volume of moving object
If multiple insulated wires are densely arranged in multicore cable, then cable compactness is improved, but crosstalk between wires increases making correspondence identification difficult
Solution Approach 1:
The patent applies preliminary anti-action by inputting a phase-inverted test signal to adjacent insulated wires before measuring the target wire. This pre-applied opposite-phase signal counteracts the crosstalk interference that would otherwise be induced in the target wire during capacitive coupling testing, enabling accurate measurement while maintaining non-contact testing speed
Solution Approach 2:
The patent applies local quality by treating each insulated wire differently in the testing process. The target wire receives a normal test signal while adjacent wires receive phase-inverted signals, creating localized signal characteristics that enable precise identification of correspondence relationships even in densely packed configurations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces crosstalk, allowing for accurate identification and connection of insulated wires in multicore cables, even when densely arranged, thereby improving the efficiency of the testing process and cable assembly.
Implementation Method 1
inputting a test signal, by capacitive coupling, to an end portion of the tested insulated wire among end portions of the insulated wires exposed at one end of the multicore cable
Implementation Method 2
inputting a phase-inverted test signal in an opposite phase to that of the test signal, by capacitive coupling, to an end portion of the insulated wire, other than the end portion of the tested insulated wire
Implementation Method 3
measuring voltages of output signals output by capacitive coupling respectively from end portions of the insulated wires exposed at the other end of the multicore cable
Data Source
AI summary
A method for testing a multicore cable including not less than three insulated wires to identify a correspondence relationship between one end portion and an other end portion of the insulated wires exposed from both ends of the multicore cable. The method includes inputting a test signal, by capacitive coupling, to an end portion of the tested insulated wire among end portions of the insulated wires exposed at one end of the multicore cable, inputting a phase-inverted test signal in an opposite phase to that of the test signal, by capacitive coupling, to an end portion of the insulated wire, other than the end portion of the tested insulated wire, and measuring voltages of output signals output respectively from end portions of the insulated wires exposed at the other end of the multicore cable to identify an other end portion of the tested insulated wire based on the measured voltages.