Multicore Cable Testing via Capacitive Coupling and Shield Grounding
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Solution Overview
Problem
Testing multicore cables with numerous insulated wires is challenging due to high crosstalk when using AC test signals without contact, making it difficult to accurately identify the correspondence relation between the ends of the wires.
Innovation Solution
A method where the common shield of the multicore cable is grounded, allowing a test signal to be input via capacitive coupling to one end of the cable, and the output signals from the other end are measured to identify the correct wire, reducing crosstalk and ensuring accurate identification.
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 making accurate identification difficult
Solution Approach 1:
The patent introduces a common shield as an intermediary component between the insulated wires. The shield is grounded to provide a reference potential and acts as a mediator that reduces electromagnetic interference and crosstalk between adjacent wires during capacitive coupling testing, thereby maintaining measurement precision while enabling non-contact testing
Solution Approach 2:
The patent changes the electrical parameter of the common shield by grounding it to have the same potential as the measurement system ground. This parameter change (setting shield potential to ground potential) reduces the voltage difference between the shield and surrounding environment, thereby minimizing crosstalk and electromagnetic interference during capacitive coupling
2Volume of moving object
If numerous insulated wires are highly densely arranged in the multicore cable, then cable compactness is improved, but crosstalk during non-contact capacitive coupling increases
Solution Approach 1:
The common shield serves as a protective intermediary surrounding the densely arranged insulated wires. By grounding the shield, it creates a controlled electromagnetic environment that isolates individual wires from each other, reducing crosstalk despite the dense packing configuration
Solution Approach 2:
The patent changes the electrical potential parameter of the common shield by connecting it to ground. This parameter change establishes a reference potential that reduces electromagnetic field strength between adjacent wires, thereby reducing crosstalk in the compact cable structure
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, enabling accurate identification of the correspondence relation between the ends of the insulated wires, even in densely arranged multicore cables, by utilizing capacitive coupling and grounding the common shield.
Implementation Method 1
allowing the common shield to have a same potential as a measurement system ground
Implementation Method 2
inputting a test signal, by capacitive coupling, to an end portion of the insulated wire under test
Data Source
AI summary
A method for testing a multicore cable including a single common shield covering plural insulated wires to identify a correspondence relation between one end portion and the other end portion of the insulated wires exposed from both ends of the multicore cable. The testing method includes allowing the common shield to have a same potential as a measurement system ground, inputting a test signal, by capacitive coupling, to an end portion of the insulated wire under test among end portions of the insulated wires exposed at one end of the multicore cable, and 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, and identifying the other end portion of the insulated wire under test based on the measured voltages.