Method for testing multicore cable, method for manufacturing multicore cable assembly, and multicore cable test device

1. A method for testing a multicore cable comprising at least three insulated wires collectively covered with a jacket 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 testing method comprising:

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, among the end portions of the insulated wires exposed at the one end of the multicore cable;

wherein the phase-inverted test signal is generated from a phase shifter by shifting phase of the test signal or the phase-inverted test signal is generated from a voltage source; 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 to identify an other end portion of the tested insulated wire based on the measured voltages.

2. The method according to claim 1 , wherein the other end portion of the tested insulated wire is identified based on voltage of a detection signal obtained by multiplying the output signal output from an end portion of each insulated wire exposed at the other end of the multicore cable by a reference signal having the same phase as the test signal.

3. The method according to claim 2 , wherein among the end portions of the insulated wires exposed at the other end of the multicore cable, an end portion with the detection signal having the largest voltage is identified as the other end portion of the tested insulated wire.

4. The method according to claim 1 , further comprising:

determining whether an end portion of any of the insulated wire exposed at one end of the multicore cable corresponds to duplicate other end portions; and

when there is a duplication, changing the insulated wire to which the phase-inverted test signal is input to re-identify a correspondence relationship between one end portion and the other end portion of at least the tested insulated wire having duplicate end portions at the other end.

5. A method for manufacturing a multicore cable assembly that comprises a multicore cable comprising at least three insulated wires collectively covered with a jacket and connectors or circuit boards provided at both ends of the multicore cable, the manufacturing method comprising:

arranging wires;

stripping the insulated wires to expose conductors at end portions; and connecting the exposed conductors to terminals of the connectors or electrode patterns of the circuit board,

wherein the arranging wire comprises identifying a corresponding end portion by identifying a correspondence relationship between one end portion and an other end portion of the insulated wires exposed from both ends of the multicore cable and arranging end portions of the insulated wires exposed from the both ends of the multicore cable in desired order, and wherein the identifying of the corresponding end portion comprises: 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, among the end portions of the insulated wires exposed at the one end of the multicore cable;

wherein the phase-inverted test signal is generated from a phase shifter by shifting phase of the test signal or the phase-inverted test signal is generated from a voltage source; and

measuring voltages of output signals output by capacitive coupling respectively from end portions of the insulated wires exposed at an other end of the multicore cable to identify the other end portion of the tested insulated wire based on the measured voltages.

6. A multicore cable test device for testing a multicore cable comprising at least three insulated wires collectively covered with a jacket 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 device comprising:

a test signal input that inputs 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;

a phase inverter that inputs 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, among the end portions of the insulated wires exposed at the one end of the multicore cable;

wherein the phase-inverted test signal is generated by shifting phase of the test signal or the phase-inverted test signal is generated from a voltage source; and

a processor configured to measure output voltages output by capacitive coupling respectively from end portions of the insulated wires exposed at an other end of the multicore cable to identify the other end portion of the tested insulated wire based on the measured output voltages.

7. A method for testing a multicore cable comprising at least three insulated wires collectively covered with a jacket 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 testing method comprising:

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, the insulated wires not under test not being grounded;

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, among the end portions of the insulated wires exposed at the one end of the multicore cable;

wherein the phase-inverted test signal is generated from a phase shifter by shifting phase of the test signal or the phase-inverted test signal is generated from a voltage source; 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 to identify an other end portion of the tested insulated wire based on the measured voltages.

8. The method according to claim 7 , wherein the other end portion of the tested insulated wire is identified based on voltage of a detection signal obtained by multiplying the output signal output from an end portion of each insulated wire exposed at the other end of the multicore cable by a reference signal having the same phase as the test signal.

9. The method according to claim 8 , wherein among the end portions of the insulated wires exposed at the other end of the multicore cable, an end portion with the detection signal having the largest voltage is identified as the other end portion of the tested insulated wire.

10. The method according to claim 7 , further comprising:

determining whether an end portion of any of the insulated wire exposed at one end of the multicore cable corresponds to duplicate other end portions; and

when there is a duplication, changing the insulated wire to which the phase-inverted test signal is input to re-identify a correspondence relationship between one end portion and the other end portion of at least the tested insulated wire having duplicate end portions at the other end.

11. A method for manufacturing a multicore cable assembly that comprises a multicore cable comprising at least three insulated wires collectively covered with a jacket and connectors or circuit boards provided at both ends of the multicore cable, the manufacturing method comprising:

arranging wires;

stripping the insulated wires to expose conductors at end portions; and connecting the exposed conductors to terminals of the connectors or electrode patterns of the circuit board,

wherein the arranging wire comprises identifying a corresponding end portion by identifying a correspondence relationship between one end portion and an other end portion of the insulated wires exposed from both ends of the multicore cable and arranging end portions of the insulated wires exposed from the both ends of the multicore cable in desired order, and wherein the identifying of the corresponding end portion comprises: 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, the insulated wires not under test not being grounded;

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, among the end portions of the insulated wires exposed at the one end of the multicore cable; and

wherein the phase-inverted test signal is generated from a phase shifter by shifting phase of the test signal or the phase-inverted test signal is generated from a voltage source; and

measuring voltages of output signals output by capacitive coupling respectively from end portions of the insulated wires exposed at an other end of the multicore cable to identify the other end portion of the tested insulated wire based on the measured voltages.

12. A multicore cable test device for testing a multicore cable comprising at least three insulated wires collectively covered with a jacket 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 device comprising:

a test signal input that inputs 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, the insulated wires not under test not being grounded;

a phase-inverter that inputs 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, among the end portions of the insulated wires exposed at the one end of the multicore cable;

wherein the phase-inverted test signal is generated by shifting phase of the test signal or the phase-inverted test signal is generated from a voltage source; and

a processor configured to measure output voltages output by capacitive coupling respectively from end portions of the insulated wires exposed at an other end of the multicore cable to identify the other end portion of the tested insulated wire based on the measured output voltages.