JP2001165986A - Cable inspecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make identifiable in which state of conduction, short circuit and disconnection a cable core is and improve the working efficiency. SOLUTION: A resistance connector 10 for inspection is fitted to the terminal end of the cable 1, and a resistor 11 for inspection of the resistance connector 10 is connected to the core 2 of the cable 1. A power source case 12 for inspection is set to the start end of the cable 1. A power source 14 for inspection, a variable resistor 15, an ammeter 16, a state-judging circuit 17, etc., are connected to the core 2 of the cable 1. The core 12 to be inspected is selected by a selecting switch 26. A current flowing in the variable resistor 15 is detected by the ammeter 16, whereby the state of the core 2 is identified. Meanwhile, a voltage impressed to the core 2 is detected by the state-judging circuit 17, so that the state of the core 2 is identified. LEDs 23, 24 and 25 emit light, depending on the state, i.e., conduction, short circuit or disconnection of the core 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable inspection apparatus suitable for use in inspecting a connection state of a cable provided in a building such as a building.

[0002]

2. Description of the Related Art Generally, buildings such as buildings include:
In order to mutually connect computers, AV equipment, telephone lines, and the like between a plurality of rooms, a cable 1 as shown in FIGS. 6 and 7 may be attached. Such a cable 1 has a large number of core wires 2 along with digitization of signals.
a, 2b,... 2n (hereinafter referred to as the core wire 2 as a whole), and connectors 3 and 4 for connection to a computer or the like are attached to both ends thereof.

After the wiring work for providing the cable 1 in a building as described above, it is necessary to check whether or not the cable 1 is correctly connected. For this reason, a tester 5 is used in the cable inspection device according to the prior art, and a continuity test is performed using the tester 5 according to the following procedure to check whether or not each core wire 2 is connected normally. Was.

That is, first, a total of two workers are arranged at both ends of the cable 1, one each. Next, the worker located on the terminal side of the cable 1 attaches the short-circuit cable 6 to the terminal side of the cable 1 and connects the core wires 2, for example, between the core wires 2 a and 2 b by the short-circuit cable 6. Next, the worker located on the starting end side of the cable 1 brings the electrodes 5A, 5B of the tester 5 into contact with the core wires 2a, 2b on the starting end side. Finally, a weak current is caused to flow through the core wires 2a and 2b by the tester 5, and when the weak current flows, the core wires 2a and 2b
Is normally connected, and when no weak current flows, core wire 2
a and 2b were determined to be disconnected.

[0005]

In the above-mentioned prior art, the short-circuit cable 6 is attached to the end of the cable 1 and the tester 5 is attached to the beginning of the cable 1. Need to do,
There is a problem that work efficiency is poor.

Particularly, when the terminal side of the cable 1 is arranged on the first floor of the building and the starting end side is arranged on the second floor, etc.
It is necessary to identify the core wires 2a, 2b and the like to be connected by communicating with each other using a communication means such as a transceiver between the named workers, and to check the connection state, resulting in a problem that the working time becomes extremely long. .

For example, when the number of the core wires 2 exceeds 10, the short-circuit cable 6 and the electrodes 5A and 5B of the tester 5 are brought into contact with the respective core wires 2 in order, and all the core wires 2 are connected. The condition needs to be checked. For this reason, for example, when switching from the core wire 2a to the core wire 2b,
In addition, there is a problem that a connection error such as connection to the terminal c is likely to occur and workability is extremely poor.

Further, while the connectors 3 and 4 provided at both ends of the cable 1 tend to be downsized, the number of core wires 2 connected to the connectors 3 and 4 tends to increase. Therefore, when the core wire 2 is connected to the connectors 3 and 4, for example, the two core wires 2a and 2b may be connected by solder or the like. On the other hand, the conventional tester 5 recognizes that a weak current has flowed between the core wires 2a and 2b, and thus has a problem that such a poor connection of the cable 1 cannot be detected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a method for controlling conduction between core wires, short-circuiting, and the like.
An object of the present invention is to provide a cable inspection device that can identify a disconnection and can improve work efficiency.

[0010]

According to a first aspect of the present invention, there is provided a cable inspection apparatus which has a built-in inspection resistor and is attached to a terminal end of a cable having a plurality of core wires. An inspection resistance connector for connecting a resistor to each core wire, an inspection power supply case equipped with an inspection power supply attached to the starting end of the cable and connected in series to the inspection resistance through each core wire, and the inspection power supply case A conducting state when a current flows through the core of the cable through the test resistor, a short-circuit state when a current flows through the core of the cable without passing through the test resistor, and a state where no current flows through the core of the cable. And a notifying means provided in the inspection power supply case for notifying the state determined by the state determining means.

[0011] With this configuration, by attaching the inspection power supply case to the starting end of the cable in a state where the inspection resistor connector is attached to the end of the cable, it is possible to prevent the current from flowing through the inspection resistor. Three states can be determined as a conductive state, a short-circuit state when a current flows through the core of the cable without passing through the inspection resistor, and a disconnection state when no current flows through the core of the cable.

According to a second aspect of the present invention, the cable has three or more core wires, and the inspection power supply case is provided with a selection switch for selectively connecting the core wire of the cable to the state determination means. It is in.

Thus, even when the cable has a large number of cores, the inspection can be performed by sequentially selecting the cores connected to the state determining means by the selection switch, and the multiple cores can be normally connected. Can be easily inspected.

Further, the invention according to claim 3 is characterized in that the selection switch is constituted by an interlocking type switch which interlocks and switches two core wires in order to connect the state discriminating means to two adjacent core wires. .

This makes it possible to inspect whether or not two adjacent core wires in which a short circuit is most likely to occur, such as when connectors are provided at both ends of the cable, are in a conductive state.
For this reason, even if the cable has a large number of core wires, it is possible to reliably test that all the core wires are normally connected.

According to a fourth aspect of the present invention, there is provided a state determining means which is located between the test power supply and the starting end of the cable and is connected in series with the test resistor and a current flowing through the series resistor. And the notifying means is constituted by a display unit of the ammeter for displaying a current value detected by the ammeter.

Thus, the ammeter detects the current flowing through the series resistor. For this reason, the ammeter conducts when current flows through the series resistor and the test resistor, short-circuits when current flows only through the series resistor, and breaks when current does not flow through the series resistor. The state can be determined. Then, by displaying the value of the current flowing through the series resistor by the display unit of the ammeter, it is possible to inform the operator whether or not the cable connection is normal.

Further, the state determining means according to the present invention comprises a series resistor located between the test power supply and the starting end of the cable, the series resistor being connected in series to the test resistor, and a series resistor connected to the test resistor. When the voltage at the connection point between the core wire on the starting end side becomes the first voltage value divided by the series resistance and the test resistance, the state becomes conductive, and when the voltage becomes the almost grounded second voltage value. And a state discriminating circuit for discriminating a disconnection state when the voltage value reaches a third voltage value substantially equal to the voltage value of the inspection power supply.

With this, the state determination circuit determines that the voltage at the connection point between the series resistor and the core wire on the starting end side of the cable is the first to the first.
By determining which of the third voltage values the voltage value is, it is possible to identify whether the cable is in a conductive state, a short-circuit state, or a disconnection state.

Further, the notifying means according to the invention of claim 6 comprises:
A lamp is connected to the output side of the state discriminating circuit and emits light of different colors according to an output signal from the state discriminating circuit according to a conduction state, a short-circuit state, and a disconnection state.

Thus, since the lamp emits light in different colors depending on the conduction state, the short-circuit state, and the disconnection state, the operator can easily recognize the state of the cable by looking at the lamp. it can.

Further, the notifying means according to the invention of claim 7 comprises:
The buzzer is connected to the output side of the state determination circuit and emits a different notification sound according to an output signal from the state determination circuit according to a conductive state, a short-circuit state, and a disconnection state.

Accordingly, the buzzer emits a different notification sound depending on the conduction state, the short-circuit state, and the disconnection state. Therefore, the worker can easily recognize the state of the cable by distinguishing the notification sound of the buzzer. be able to.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cable inspection apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS.

First, FIGS. 1 to 3 show a first embodiment of the present invention. In the drawings, reference numeral 10 denotes an inspection resistor connector provided on the terminal side of the cable 1; , A connector case 10A for attaching to the connector 2 of the cable 1, and the connector case 10A has (n-1) test resistors for connecting n core wires 2a, 2b,. 11a, 11b, ... 1
1n-1 (hereinafter, referred to as an inspection resistor 11 as a whole) is incorporated. Then, each of the inspection resistors 11a, 11
.., 11n-1 are each set to a resistance value R of about 3 kΩ, for example. Further, each of the test resistors 11a, 1
.., 11n-1 are an n-th core wire 2n and other core wires 2a, 2b,
.. 2n-1 and in parallel with the n-th core wire 2n.

Reference numeral 12 denotes an inspection power supply case provided on the starting end side of the cable 1. The inspection power supply case 12 includes an inspection power supply 14, a variable resistor 15, an ammeter 16, a state determination circuit 17, and a selection switch 26, which will be described later. Etc. are provided. The inspection power supply case 12 has a connector 3 of the cable 1.
The inspection power supply 14 and the like are connected to each core wire 2 of the cable 1 through the connection connector 13.

Reference numeral 14 denotes an n-th core wire 2n and other core wires 2a,
The power supply for inspection is connected between the power supply 2b,... 2n-1. The power supply for inspection 14 is composed of a battery or the like having a voltage value V0 of, for example, about 3 V. The driving voltage is supplied to the determination circuit 17.

Reference numeral 15 denotes an inspection power supply 14 and core wires 2a, 2b,
.. Is a variable resistor as a series resistor connected in series with 2n-1. The variable resistor 15 has a value of approximately 3 kΩ between 1 kΩ and 5 kΩ, for example, the same value as the test resistor 11 of the test resistor connector 10. The resistance value is set to R. As a result, the variable resistor 15 reduces the current flowing through the core wire 2 to about 1 mA, thereby preventing the test power supply 14 from being worn out early.

Reference numeral 16 denotes an ammeter connected in series between the variable resistor 15 and the inspection power supply 14 as first state determination means. The ammeter 16 detects a current flowing through the variable resistor 15. (Not shown) and a display unit 1 as first notification means for displaying a current detected by the current detection unit.
6A. Then, the display unit 16A
Is provided with a pointer 16B that is displaced in accordance with the detected current, and displays the value of the current flowing through the variable resistor 15 according to the stop position of the pointer 16B.

As a result, the ammeter 16
When a current is flowing through the test resistor 11 and the test resistor 11, it is determined that the current is flowing, and for example, the pointer 16B is stopped at a substantially central position of the display 16A. Further, the ammeter 16 determines that a current is flowing only through the variable resistor 15 as a short-circuit state, and, for example, indicates the pointer 16 at the maximum amplitude position of the display unit 16A.
Stop B. Further, the ammeter 16 includes a variable resistor 15
When no current is flowing through the display section 16A, the pointer 16B is stopped at the minimum amplitude position of the display section 16A, for example.

Reference numeral 17 denotes a state discriminating circuit connected between the variable resistor 15 and the core wire 2 as second state discriminating means. The state discriminating circuit 17 includes first and second comparators 20,
21 and a NOR circuit 22 and the like.

Reference numerals 18 and 19 denote input resistors connected to a connection point A between the variable resistor 15 and the core wire 2.
8 and 19 are set to substantially the same resistance value of, for example, about 100 kΩ and are connected in series with each other.
n and any one of the core wires 2a, 2b,... 2n-1. Then, the input resistor 19 divides the voltage applied to the connection point A to approximately half the voltage, and
Are input to the comparators 20 and 21.

Here, when the core wire 2 is in a conductive state, the inspection power supply 14 includes the variable resistor 15 and the inspection resistor 11.
Are connected in series, the voltage at the connection point A is a first voltage value V1 (V1 検 査) obtained by dividing the voltage value V0 of the inspection power supply 14 into approximately half by the variable resistor 15 and the inspection resistor 11.
V0 / 2).

When the core wire 2 is short-circuited,
Since the connection point A is grounded, the voltage at the connection point A has a second voltage value V2 (V220) which is almost grounded.

Further, when the core wire 2 is disconnected, the connection point A is opened. Therefore, the voltage at the connection point A is equal to the third voltage value V3 substantially equal to the voltage value V0 of the inspection power supply 14.
(V3 ≒ V0).

Therefore, the input resistor 19 converts the first, second, and third voltage values V1, V2, and V3 into halved voltage values V1 / 2, V2 / 1/2, and V3 / 2. 1st, 2nd
Are input to the comparators 20 and 21.

Reference numeral 20 denotes a first comparator for determining whether or not the core wire 2 is disconnected. The first comparator 20 has a non-inverting input terminal connected between the voltage dividing resistors 18 and 19. At the same time, an inverting input terminal is connected between the voltage dividing resistors 20A and 20B, and the voltage value V0 of the inspection power supply 14 is supplied to the voltage dividing resistors 20A and 20B.

A capacitor 20C for stabilizing the operation of the comparator 20 is connected to the inverting input terminal of the comparator 20 in parallel with the voltage dividing resistor 20B. On the other hand, a pull-up resistor 20D is connected to the output terminal of the comparator 20, and the voltage value V0 of the test power supply 14 is supplied to the pull-up resistor 20D.

Here, the first voltage value V is applied to the non-inverting input terminal of the comparator 20 when the core wire 2 is turned on.
A voltage value V1 / 2 which is half of 1 is input. On the other hand, core wire 2
Is disconnected, a voltage value V3 / 2, which is half of the third voltage value V3, is input.

For this reason, these voltage values V are applied to the inverting input terminal of the comparator 20 by the voltage dividing resistors 20A and 20B.
For example, a voltage of about 1.125 V is inputted as the first determination voltage value VA between 1/2 and V3 / 2. Therefore, the comparator 20 outputs a high-potential “H” (high) output signal when the core wire 2 is in a disconnected state, and has a low potential when a conductive or short-circuited state is set. An output signal of "L" (low) is output.

Reference numeral 21 denotes a second comparator for determining whether or not the core wire 2 is in a short-circuit state. The second comparator 21 has its inverting input terminal connected between the voltage dividing resistors 18 and 19. At the same time, a non-inverting input terminal is connected between the voltage dividing resistors 21A and 21B, and the voltage value V0 of the inspection power supply 14 is supplied to the voltage dividing resistors 21A and 21B.

The non-inverting input terminal of the comparator 21
Capacitor 21C for stabilizing operation of comparator 21
Are connected in parallel to the voltage dividing resistor 21B. On the other hand, a pull-up resistor 21D is connected to the output terminal of the comparator 21, and the voltage value V0 of the test power supply 14 is supplied to the pull-up resistor 21D.

Here, the inverting input terminal of the comparator 21
When the core wire 2 becomes conductive, a voltage value V1 / 2, which is half the first voltage value V1, is input. On the other hand, when the core wire 2 is short-circuited, a voltage value of 0 V substantially equal to the second voltage value V2 is input.

For this reason, the non-inverting input terminal of the comparator 21 is connected to these voltage values V by the voltage dividing resistors 21A and 21B.
For example, a voltage of about 0.375 V is input as the second determination voltage value VB between 1/2 and V2. Therefore, the comparator 21 outputs an “H” output signal when the core wire 2 is short-circuited, and outputs an “L” output signal when the conductive wire is disconnected or disconnected.

Reference numeral 22 denotes a NOR circuit for determining whether or not the core wire 2 is in a conductive state. The NOR circuit 22 has an input terminal connected to the output terminals of the first and second comparators 20 and 21. I have. Therefore, when the “L” output signal is output from the first and second comparators 20 and 21, the NOR circuit 22 outputs an “H” output signal, and the first and second comparators 20 and 21 output the “H” output signal. , 21 output an "L" output signal when an "H" output signal is output. Thus, the NOR circuit 22 outputs an output signal of “H” when the core wire 2 is in the conductive state, and outputs an output signal of “L” when the core wire 2 is in the short-circuit state or the disconnection state.

Reference numerals 23, 24, and 25 denote light emitting diodes (hereinafter, referred to as LEDs) serving as lamps as second notification means.
The LED 23 is connected to the output terminal of the first comparator 20, the LED 24 is connected to the output terminal of the second comparator 21, and the LED 25 is connected to the output terminal of the NOR circuit 22. In the LED 23, two NOT circuits 23A, 23A for driving current supply and a current supply resistor 23B are connected between the LED 23 and the output terminal of the first comparator 20. Two NOT circuits 24A, 24A and a current supply resistor 2 are provided between the LED 24 and the second comparator 21.
4B, the LED 25 and the NOR circuit 22
Are connected to two NOT circuits 25A, 25A and a current supply resistor 25B.

The LED 23 lights red when the core wire 2 is disconnected, the LED 24 lights orange when the core wire 2 is short-circuited, and the LED 25 lights red when the core wire 2 is short-circuited.
Lights green when is turned on.

Reference numeral 26 denotes a selection switch provided between the variable resistor 15 and the starting end of the cable 1 (connector 13). The selection switch 26 constantly grounds the core wire 2n and also connects the other core wires 2a, 2a. One of the core wires 2 is selected from 2b,... 2n-1 and connected to the variable resistor 15.

The rotation detecting device according to the present embodiment has the above-described configuration, and its operation will be described next.

First, the test resistance connector 10 is connected to the connector 3 on the end side of the cable 1, and then the connection connector 13 of the test power supply case 12 is connected to the connector 4 on the start end of the cable 1. Next, the operator closes a drive switch (not shown) of the inspection power supply case 12 and supplies a drive voltage to the comparator 20 and the like of the state determination circuit 17. Then, the operator uses the selection switch 26 to select the core wires 2a, 2a.
b,..., 2n−1, for example, the core wire 2a is selected as an inspection target, and the variable resistor 15 and the core wire 2a are connected.

Here, a case in which the core wire 2a is broken due to defective soldering between the cable 1 and the connectors 3, 4 will be described.

In this case, since the output side of the variable resistor 15 is not connected to any of them and is opened, no current flows through the variable resistor 15. For this reason, the ammeter 16 does not detect the current, and the indicator 1
6B stops at the minimum amplitude position in the display section 16A as indicated by the solid line in FIG.

On the other hand, when the core wire 2a is broken,
As shown in FIG. 2, the voltage value on the output side (connection point A) of the variable resistor 15 becomes a third voltage value V3 substantially equal to the voltage value V0 of the inspection power supply 14. At this time, since the third voltage value V3 is input to the state determination circuit 17 connected between the variable resistor 15 and the core wire 2a, the first and second comparators 2
A voltage value (V3 / 2) obtained by dividing the voltage approximately by half by the input resistors 18 and 19 is input to 0 and 21.

The first comparator 20 has the input resistance 1
Since the voltage value (V3 / 2) inputted by 9 becomes higher than the first determination voltage value VA, an "H" output signal is output. On the other hand, the second comparator 21 outputs the voltage value (V3
/ 2) is higher than the second determination voltage value VB, so that an "L" output signal is output. Further, the NOR circuit 22 outputs an “L” output signal since the “H” output signal is input from the first comparator 20. As a result, the red LED 23 emits light, and the LEDs 24 and 25 are turned off.

Next, a case where the core wire 2a and the core wire 2n are short-circuited due to poor soldering between the cable 1 and the connectors 3 and 4 will be described.

In this case, since the output side of the variable resistor 15 is grounded, a voltage from the inspection power supply 14 is applied to both ends of the variable resistor 15. For this reason,
The ammeter 16 detects, as a current flowing through the variable resistor 15, a current of, for example, about 1 mA as a current value (V0 / R) determined by the voltage value V0 of the inspection power supply 14 and the resistance value R of the variable resistor 15. Pointer 16B of display 16A
Stops at the maximum amplitude position in the display section 16A as shown by the dashed line in FIG.

On the other hand, when the core wire 2a is short-circuited,
As shown in FIG. 2, the voltage value on the output side (connection point A) of the variable resistor 15 becomes the second voltage value V2, which is almost 0V. At this time, the state determination circuit 17 connected between the variable resistor 15 and the core wire 2a supplies the second voltage value V that has become substantially 0V.
2 is input, a voltage value V2 of almost 0 V is also input to the first and second comparators 20 and 21.

The first comparator 20 has the input resistance 1
Since the second voltage value V2 input by 9 becomes lower than the first determination voltage value VA, an "L" output signal is output. On the other hand, the second comparator 21 outputs the second voltage value V
2 is lower than the second determination voltage value VB.
The output signal of "H" is output. Further, the NOR circuit 22
Outputs an “L” output signal since the “H” output signal is input from the second comparator 21. As a result, the orange LED 24 emits light, and the LEDs 23 and 25 are turned off.

Further, a case where the cable 1 and the connectors 3 and 4 are normally connected by soldering and the core 2a and the core 2n are electrically connected will be described.

In this case, the output side of the variable resistor 15 is grounded through the test resistor 11 of the test resistor connector 10. At this time, the variable resistor 15 has a current value (V0 / (2 × R) determined by the voltage value V0 of the test power supply 14 and the resistance value (2 × R) of the combined resistance of the test resistor 11 and the variable resistor 15. ), For example, a current of about 0.5 mA flows. For this reason, the ammeter 16 calculates the current value (V
0 / (2 × R)), and the pointer 16B of the display section 16A is moved to the display section 16A as shown by a two-dot chain line in FIG.
Stop at approximately the center of the.

On the other hand, when the core wire 2a is conducting,
As shown in FIG. 2, the voltage value on the output side (connection point A) of the variable resistor 15 is obtained by dividing the voltage value V0 of the test power supply 14 by the test resistor 11 of the test resistor connector 10 (V0 / 2) is the first voltage value V1. At this time, the first voltage value V1 is input to the state determination circuit 17 connected between the variable resistor 15 and the core wire 2a.
The first and second comparators 20 and 21 have input resistors 18 and 19, respectively.
, A voltage value (V1 / 2) which is substantially divided by half is input.

The first comparator 20 has the input resistance 1
Since the voltage value (V1 / 2) inputted by 9 becomes lower than the first determination voltage value VA, an "L" output signal is output. The second comparator 21 also supplies the voltage value (V1
/ 2) is higher than the second determination voltage value VB, so that an "L" output signal is output. On the other hand, NOR circuit 2
2 outputs an “H” output signal since an “L” output signal is input from each of the first and second comparators 20 and 21. As a result, the green LED 25 emits light,
The LEDs 23 and 24 are turned off.

Therefore, the display section 16A of the ammeter 16 and the LE
D23, 24, and 25 operate as shown in Table 1 below according to the disconnection state, short-circuit state, and conduction state of the core wire 2a and the core wire 2n. Thus, the operator can easily identify whether the core wire 2a and the core wire 2n are in a disconnected state, a short-circuit state, or a conductive state by looking at the display unit 16A or the LEDs 23, 24, and 25. .

[0064]

[Table 1]

After inspecting the connection between the core wire 2a and the core wire 2n, the operator operates the selection switch 26 to connect the variable resistor 15 to the core wire 2b instead of the core wire 2a, and to display the display of the ammeter 16. 16A or LED23,2
Visually look at 4,25. As a result, the operator simply switches the core wire 2 connected to the variable resistor 15 by the selection switch 26, and sequentially checks whether or not the core wires 2a, 2b,... 2n-1 are connected normally. Can be.

Thus, in the present embodiment, the inspection resistor connector 10 having the built-in inspection resistor 11 and attached to the end side of the cable 1, the inspection power supply 14 and the variable resistor 15 attached to the starting end of the cable 1, Since the cable inspection device is constituted by the ammeter 16 and the inspection power supply case 12 including the state determination circuit 17 and the like, the ammeter 16 and the state determination circuit 17 allow the core wire 2 to be in any of a conductive state, a short-circuit state, and a disconnected state. The state can be determined. This makes it possible to detect a short-circuit state of the core wire 2 that could not be inspected by the conventional technique, and to reliably inspect that the core wire 2 is connected normally.

Also, since the inspection resistor connector 10 is connected to the end of the cable 1 and the inspection power supply case 12 is connected to the starting end, the state of the core wire 2 is inspected.
Even a worker with the name can easily inspect whether or not the core wire 2 is properly connected by attaching the inspection resistance connector 10 and the inspection power supply case 12 to the cable 1, thereby improving workability. .

The starting end of the cable 1 and the variable resistor 15
The selection switch 26 for selectively switching the core wire 2 connected to the variable resistor 15 is provided between them, so that even when the cable 1 has a large number of core wires 2, the operator operates the selection switch 26. The inspection of each of the cores 2 can be performed in order only with this, and it can be easily inspected whether or not a large number of the cores 2 are normally connected.

A variable resistor 15 connected in series to the test resistor 11 of the test resistor connector 10 through the test power supply 14 and the core wire 2 of the cable 1, and an ammeter 16 for detecting a current flowing through the variable resistor 15. Since the first state determination means is constituted by the above, the ammeter 16 detects the current flowing through the variable resistor 15 and can determine whether the core wire 2 is in a conductive state, a short-circuit state, or a disconnected state. . Further, since the ammeter 16 is used to determine the state of the core wire 2, for example, when various types of devices are connected to the end side of the cable 1, the current flowing through these devices can be detected.

Further, the second state discriminating means is constituted by the variable resistor 15 and the state discriminating circuit 17 for discriminating the state based on the voltage at the connection point A between the variable resistor 15 and the core wire 2. It is possible to determine whether the core wire 2 is in a conductive state, a short-circuit state, or a disconnection state by using 17, and output an output signal corresponding to each state.
For this reason, by connecting the LEDs 23 to 25 to the state determination circuit 17, the state of the core wire 2 can be easily notified to the operator, and other notification means can be used instead of the LEDs 23 to 25.

In this case, the LEDs 23 to 25 that emit light of different colors according to the conductive state, the short-circuit state, and the disconnection state are connected to the output terminal of the state determination circuit 17, so that the worker can use the LE.
By visually observing D23 to D25, it is possible to easily recognize in which state the core wire 2 of the cable 1 is.

In the first embodiment, the resistance value of the variable resistor 15 is set to the same value as that of the test resistor 11 of the test resistor connector 10. However, for example, the test power source 14 is consumed. When the voltage drops, the test resistor 1
The resistance value may be set to a value smaller than 1. This allows
The current flowing through the variable resistor 15 can be increased, and the pointer 16B of the display 16A of the ammeter 16 can be largely swung.
The state of the core wire 2 can be easily identified.

Next, FIG. 4 shows a second embodiment of the present invention. The feature of this embodiment is that an inspection resistor connector has a built-in inspection resistor connected to an adjacent core wire.
The selector switch is constituted by an interlocking switch that switches two adjacent core wires in an interlocking manner. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 30 denotes an inspection resistor connector according to the second embodiment.
, 2 n of the cable 1, the connector case 30 A being attached to the connector 2.
a, 2b, etc., n-1 test resistors 31a,
31b,... 31n-1 (hereinafter referred to as inspection resistors 3 as a whole)
1). Therefore, the test resistors 31a, 31b,... 31n-1 are connected in series with each other. The test resistor connector 30 is connected to the end of the cable 1.

Reference numeral 32 denotes an interlocking switch provided between the variable resistor 15 and the start end of the cable 1. The interlocking switch 32 is connected to two core wires 2 adjacent to each other.
Are switched in conjunction with each other to connect the two core wires 2.

Thus, also in the present embodiment having the above-described structure, the same operation and effect as those of the first embodiment can be obtained. However, in this embodiment, the test resistor 31 is connected to the core wires 2 adjacent to each other at the end side of the cable 1 by the test resistor connector 30, and the two core wires 2 adjacent to each other are connected by the interlocking switch 32. Since the connection is switched in conjunction, connectors 3
4, adjacent 2 where short-circuiting is most likely to occur.
It can be checked whether or not the core wires 2 are conductive. For this reason, even if the cable 1 has a large number of cores 2, it is possible to reliably test that all the cores 2 are properly connected.

Next, FIG. 5 shows a third embodiment of the present invention. The feature of this embodiment is that a buzzer which emits a different notification sound according to the state is used as the notification means for notifying the state of the core wire. It is in. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 41 denotes a buzzer which constitutes a notifying means together with a buzzer 42 which will be described later. The buzzer 41 is connected to the output terminal of the second comparator 21, and a drive circuit 41A is provided between the buzzer 41 and the output terminal of the comparator 21. Is provided. And buzzer 4
1 is “H” from the comparator 21 by the drive circuit 41A.
When the output signal of “L” is output, the notification sound is emitted intermittently (intermittently), and when the output signal of “L” is output, it stops.

Reference numeral 42 denotes a buzzer connected to the output terminal of the NOR circuit 22. A drive circuit 42A is provided between the buzzer 42 and the NOR circuit 22. And buzzer 3
No. 2 emits an alarm sound continuously when the drive circuit 42A outputs the "H" output signal from the NOR circuit 22, and stops when the "L" output signal is output.

Thus, in the present embodiment having the above-described structure, the same operation and effect as those of the first embodiment can be obtained. However, in the present embodiment, the comparator 21
Is connected to the NOR circuit 22.
Since the buzzer 42 that emits a notification sound different from the above is provided, the core wire 2 is changed according to the disconnection state, the short-circuit state, and the conduction state.
A different notification sound is emitted as shown in FIG. Therefore, even when the worker cannot visually check the inspection power supply case 12, it is possible to easily recognize the state of the core wire 2 of the cable 1 by distinguishing the notification sounds of the buzzers 41 and 42. it can.

[0081]

[Table 2]

In each of the above embodiments, the power supply case 12 for inspection has an ammeter 16 as first state determination means.
Although the configuration is such that both the status determination circuit 17 and the status determination circuit 17 as the second status determination means are provided, only one of them may be provided in the inspection power supply case.

In the third embodiment, the buzzer 4 is replaced with the LEDs 23 to 25 according to the first embodiment.
Although the first and second arrangements are provided, they may be provided together.

[0084]

As described in detail above, according to the first aspect of the present invention, an inspection resistor connector attached to the terminal end of the cable and connecting the inspection resistor to the core wire, and an inspection resistor attached to the starting end of the cable. Since the cable inspection device is constituted by the power supply, the state determination means, and the inspection power supply case provided with the notification means, the inspection power supply case is provided at the starting end of the cable with the inspection resistance connector attached to the end of the cable. By attaching the cable, it is possible to identify whether the cable is in a conductive state, a short-circuit state, or a disconnection state. Therefore, even a single worker can easily inspect the connection of the cable, and the workability can be improved. Also, since the test resistor is connected to the core wire by the test resistor connector, a conduction state occurs when a current flows through the test resistor, a short-circuit condition occurs when a current flows through the core wire of the cable without passing through the test resistor. The three states can be discriminated as the disconnection state when the current does not flow through the core wire.

According to the second aspect of the present invention, the cable has three or more core wires, and the inspection power supply case is provided with a selection switch for selectively connecting the core wire of the cable to the state determination means. Even if the cable has a large number of cores, the selection switch can sequentially select and inspect the cores connected to the state determining means, and it is easy to determine whether the multiple cores are normally connected. Can be inspected.

According to the third aspect of the present invention, the selection switch is constituted by an interlocking switch that switches the two core wires in an interlocked manner to connect the state discriminating means to the two core wires adjacent to each other. It is possible to inspect whether or not two adjacent core wires, in which a short circuit is most likely to occur, such as when connectors are provided at both ends of a cable, are in a conductive state.
For this reason, even if the cable has a large number of core wires, it is possible to reliably test that all the core wires are normally connected.

According to the fourth aspect of the present invention, the state determining means is located between the inspection power supply and the starting end of the cable, and is connected in series to the inspection resistance and the current flowing through the series resistance. Since the notification means is constituted by a display section of the ammeter for displaying the current value detected by the ammeter, the ammeter detects the current flowing through the series resistor, the core wire is in a conductive state, It is possible to determine whether the state is the short-circuit state or the disconnection state. Further, since the ammeter is used to determine the state of the core wire, for example, when various devices are connected to the end of the cable, the current flowing through the devices can be detected.

According to the fifth aspect of the present invention, the state judging means includes a series resistor which is located between the test power supply and the starting end of the cable and is connected in series to the test resistor. Since it is constituted by a state discriminating circuit for discriminating when the voltage at the connection point between the core wire on the starting end side of the cable becomes the first, second, and third voltage values into a conduction state, a short-circuit state, and a disconnection state, The state determination circuit can determine whether the core wire is in a conductive state, a short-circuit state, or a disconnection state, and output an output signal corresponding to each state. Further, various notification means operating on the output signal can be connected to the state determination circuit.

Further, according to the invention of claim 6, the notifying means is constituted by lamps which emit light in different colors according to the output signal from the state discriminating circuit according to the conduction state, the short-circuit state, and the disconnection state. By looking at the lamp, it is possible to easily recognize the state of the cable.

According to the seventh aspect of the present invention, the notification means is constituted by a buzzer which emits a different notification sound according to an output signal from the state determination circuit in accordance with a conduction state, a short-circuit state, and a disconnection state. Even when the power supply case for inspection cannot be visually recognized, it is possible to easily recognize the state of the cable by distinguishing the notification sound of the buzzer.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a resistance connector for inspection and a power supply case for inspection according to a first embodiment of the present invention, together with a cable.

FIG. 2 is an electric circuit diagram showing a state where a test resistor connector and a test power supply case are connected to a cable.

FIG. 3 is a front view showing a display unit of the ammeter in FIG.

FIG. 4 shows an inspection resistor connector according to a second embodiment;
It is an electric circuit diagram showing the state where the power supply case for inspection was connected to the cable.

FIG. 5 shows an inspection resistor connector according to a third embodiment;
It is an electric circuit diagram showing the state where the power supply case for inspection was connected to the cable.

FIG. 6 is a perspective view showing a tester and a short-circuit cable according to the related art together with the cable.

FIG. 7 is an electric circuit diagram showing a state where a tester and a short-circuit cable according to the related art are connected to the cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable 2 core wire 10,30 Inspection resistance connector 11,31 Inspection resistance 12 Inspection power supply case 14 Inspection power supply 15 Variable resistance (series resistance) 16 Ammeter 16A Display part 17 State discriminating circuit 23,24,25 LED ( Lamp) 26 Selection switch 32 Interlocking switch 41, 42 Buzzer

Continued on the front page F term (reference) 2G014 AA02 AA03 AA13 AB33 AC15 5K027 BB02 FF02 FF12 FF22 GG02 LL05 5K042 CA06 DA35 EA02 FA03 FA14 GA01 HA01 HA03 HA05 JA07 KA02 LA01 LA15

Claims (7)

[Claims] 1. A test resistor connector which is attached to the terminal side of a cable having a plurality of core wires and has a built-in test resistor and connects the test resistor to each core wire, and each core wire attached to the start end side of the cable. An inspection power supply case having an inspection power supply connected in series to the inspection resistance through the inspection resistor, and conducting when a current flows through a core wire of the cable through the inspection resistance provided in the inspection power supply case. State determining means for determining when a current flows through the core wire of the cable without passing through the resistance, and a disconnection state when no current flows through the core wire of the cable; and the state determining means provided in the inspection power supply case. And a notifying means for notifying a state determined by the cable inspection device. 2. The cable has three or more core wires,
2. The cable inspection apparatus according to claim 1, wherein the inspection power supply case is provided with a selection switch for selectively connecting a core wire of the cable to the state determination unit. 3. The cable according to claim 2, wherein the selection switch is constituted by an interlocking type switch that interlocks and switches between the two core wires so as to connect the state determination means to two adjacent core wires. Inspection equipment. 4. A series meter connected between the test power supply and the starting end of the cable and connected to the test resistor and a current meter for detecting a current flowing through the series resistor. 4. The cable inspection device according to claim 1, wherein the notification unit is a display unit of an ammeter for displaying a current value detected by the ammeter. 5. A series resistor connected between the test power source and a cable start end, wherein the series resistor is connected between the test power supply and a cable start end, and a core wire on the cable start end side of the cable. A conductive state when the voltage at the connection point between the first and second resistors is the first voltage value divided by the series resistor and the test resistor, and a short-circuit state when the voltage is substantially the second voltage value that is grounded. 4. The cable inspection device according to claim 1, further comprising a state determination circuit configured to determine a disconnection state when a third voltage value substantially equal to the voltage value of the inspection power supply is reached. 6. The notifying means is connected to an output side of the state discriminating circuit, and comprises a lamp which emits light of different colors according to an output signal from the state discriminating circuit according to a conduction state, a short-circuit state, and a disconnection state. Claims 1, 2, 3,
The cable inspection device according to 4 or 5. 7. The notification means is connected to an output side of the state determination circuit, and includes a buzzer which emits different notification sounds according to an output signal from the state determination circuit according to a conduction state, a short-circuit state, and a disconnection state. Claims 1, 2,
The cable inspection device according to 3, 4, or 5.