JP2000193701A - Transmitter for probing strand in cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter for the probing of a strand in a cable, by which a signal easily reaches the end of the strand in the cable and which can be miniaturized. SOLUTION: This transmitter transmits a signal at a prescribed frequency to a strand in a cable in order to probe a specific strand out of a plurality of strands in the cable in an arbitrary place in the cable. A DC voltage from a battery 1 is boosted to a prescribed voltage by a boosting circuit 3. An oscillation circuit 7 receives the boosted voltage, and it supplies an oscillation signal at a prescribed frequency to the strand in the cable to be probed at prescribed intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable strand search transmitter for transmitting a signal of a predetermined frequency to a strand to be searched among a plurality of strands of a cable.

[0002]

2. Description of the Related Art Conventionally, when a cable having a plurality of strands is laid as a wiring path, a specific strand is searched from an arbitrary portion of the cable. A signal of a predetermined frequency is transmitted, an antenna of a receiver is brought close to each of the wires, and a signal of a predetermined frequency is received to search for a specific wire.

[0003] As a transmitter for transmitting a signal of a predetermined frequency to a strand to be searched, a DC power supply voltage such as a dry battery is applied to an oscillation circuit, and a signal of a predetermined frequency is output from the oscillation circuit. (See, for example, JP-A-9-281175)

[0004]

In the above-described transmitter for detecting a cable strand, the voltage of a DC power source such as a dry battery is directly applied to the oscillation circuit, so that the signal reaches the end of the strand of the cable. Is difficult to reach. Also, if a large capacity is incorporated to increase the voltage of the DC power supply, there is a problem that the transmitter itself becomes large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cable strand search transmitter capable of easily transmitting a signal to an end of the strand of the cable and achieving downsizing. It is in.

[0006]

According to the first aspect of the present invention, there is provided a DC power supply, and receives a DC voltage from the DC power supply and supplies an oscillation signal having a predetermined frequency at predetermined intervals. An oscillation circuit, and a cable element search transmission for supplying an oscillation signal from the oscillation circuit between two elements to be searched among a plurality of elements included in the cable or between one element and the ground. And a booster circuit for boosting a DC voltage from the DC power supply to a predetermined voltage is provided between the DC power supply and the oscillation circuit.

[0007] According to the second aspect of the present invention, the first aspect is provided.
In the transmitter for detecting a cable strand described in the above, the oscillation circuit receives a voltage boosted by the boosting circuit, and generates an oscillation signal between two strands to be searched or between one strand and the ground. And an oscillation mode for supplying cables from the DC power supply without passing through the booster circuit.
A DC voltage is supplied between one of the wires or between one of the wires and the ground, and a changeover switch for switching between a continuity check mode for checking continuity of the wire to be inspected is provided by the DC power supply and the booster circuit. Between the
A capacitor for removing a DC component of a signal is connected to the oscillation circuit, and in the oscillation mode, a supply path of an oscillation signal from which the DC component is removed from the oscillation circuit via the capacitor; At least two light-emitting elements that are color-coded are opposite to each other between the direct-current power supply path and the direct-current voltage supplied from the direct-current power supply via the changeover switch so that the lighting state differs according to each mode. It is characterized by being provided in parallel so as to have a polarity.

[0008] According to the third aspect of the present invention, the second aspect is provided.
In the transmitter for cable strand exploration described, the changeover switch is configured to be switched to a non-supply mode in which the oscillation signal and the DC voltage are not supplied to the oscillation signal supply path and the DC voltage supply path. In addition, in the non-supply mode, a signal from an external wiring path is supplied to each of the supply path of the oscillation signal and the supply path of the DC voltage, and the lighting state of each of the light emitting elements differs according to the signal. And inspecting the polarity state of the wiring path.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of a cable strand detection transmitter according to the present invention. The common contact of a changeover switch 2 is connected via a diode D1 to the high potential side of a battery 1 having a voltage of 9 V, which is a DC power supply. 20 are connected. The changeover switch 2 has individual contacts 21, 22, and 23 that are selectively connected to the common contact 20. The common switch 20 is connected to the individual contacts 21, 22, and 23 to switch to each mode described later. Can be

The individual contacts 21 of the changeover switch 2 are connected to the ICs 8 and
13 to IC 17, resistors R3 to R7, capacitors C4 and C5, and an oscillation circuit 7 including diodes D4 and D5. The voltage boosted by the boost circuit 3 is supplied to the oscillation circuit 7. The booster circuit 3 includes a general-purpose booster IC 4, capacitors C1 and C2, and diodes D2 and D3.

In a later-described oscillation mode (tone mode) in which the common contact 20 of the changeover switch 2 is connected to the individual contact 21, the capacitor C1 charges and discharges the voltage supplied from the battery 1 based on the signal of the booster IC4. The charge is repeatedly stored in the capacitor C2. Then, the charging voltage of the capacitor C2 is added to the DC voltage from the battery 1,
That is, the voltage is boosted and output to the oscillation circuit 7. The booster circuit 3 is not limited to the above configuration as long as it boosts the DC voltage of the battery 1 to a predetermined voltage.

The oscillating circuit 7 receives the boosted voltage from the boosting circuit 3 and outputs an oscillating signal of a predetermined frequency at predetermined intervals. The DC component of the oscillation signal is removed by the capacitor C3, and the oscillation signal is output to the outside from the connection terminal 9 connected to the capacitor C3 via the oscillation signal supply path A.

The individual contacts 23 of the changeover switch 2
Is connected to a ground 11 and a connection terminal 10 to the outside via a resistor R2. In the continuity check mode in which the common contact 20 of the changeover switch 2 is connected to the individual contact 23, the DC voltage from the battery 1 is supplied to the DC voltage supply path B, which is the connection point between the individual contact 23 and the resistor R2. Is output from the connection terminal 9 to the outside.

Between the supply path A and the supply path B, LEDs 5 and 6, which are light-emitting elements connected in parallel so as to have different emission colors and have opposite polarities, and a resistor R1 are connected in series. I have. That is, the LED 5 has an anode connected to the supply path B side, and the LED 6 has a cathode connected to the supply path B side. Further, a surge absorbing element 12 for protecting the circuit so that a high voltage is not applied to the transmitter is connected between the connection terminals 9 and 10 in parallel.

FIG. 2 is a perspective view showing the external appearance of the transmitter for cable strand search constructed as described above. In FIG. 2, FIG.
The same reference numerals are given to the same components. The transmitter 30, which is a transmitter for cable strand detection, includes the battery 1 described above, a booster circuit 3, and an oscillator circuit 7 in a case 31. The transmitter 30 is led out from a side surface of the case 31. The above-described oscillating signal and DC voltage are supplied through the lead wire 32 and the signal line 33 which are connected.

A crocodile clip 35 for connection to the outside is provided at the tip of the lead wire 32, and a modular plug 34 is provided at the tip of the signal wire 33. The modular plug 34 and the crocodile clip 35 are provided as necessary. Are used as the connection terminals 9 and 10 shown in FIG. 2 is case 3
Reference numeral 1 denotes the above-described changeover switch exposed on the surface, and reference numerals 5 and 6 denote LEDs.

In the above-described oscillation mode, an oscillation signal of a predetermined frequency is transmitted from the transmitter 30 to a specific strand of a cable having a plurality of strands, and an antenna of a receiver (not shown) is placed near each strand. By receiving the signal of the predetermined frequency transmitted from the transmitter 30, a specific element wire is searched at an arbitrary position of the cable. here,
As described above, by connecting the connection terminals 9 and 10 to each of two ends of the two wires connected to each other, or to the search wires and the ground wire, as described above. An oscillating signal of a predetermined frequency from which a direct current component is removed, which appears in the supply path A, is supplied to the element wire to be searched.

As described above, the DC voltage from the battery 1 is boosted by the booster circuit 3, and the boosted circuit receives the boosted voltage and supplies an oscillating signal of a predetermined frequency from the oscillating circuit 7 to the strand to be searched for the cable. Therefore, the level of the supplied signal is increased, and the signal can be easily transmitted to the end of the strand of the cable. Further, the oscillation signal from the oscillation circuit 7 may be configured to be boosted and amplified so that the signal can easily reach the end of the strand of the cable.

In this oscillation mode, the supply path A → the resistor R1 → the LED 6 → in accordance with the oscillation signal of a predetermined frequency from which the DC component has been removed by the capacitor C3 appearing in the supply path A.
Supply path B → resistance R2 → ground 11 or ground 11 → resistance R2 → supply path B → LED5 → resistance R1 →
The current flows alternately in the order of supply path A, and LED5, LED5
6 flashes alternately.

On the other hand, in the continuity check mode described above,
A DC voltage is supplied to the wire to be inspected to check whether or not a closed circuit is formed, and the continuity of the wire is checked. At this time, as described above, the connection terminals 9 and 10 are connected to one end of the two strands connected to the other end constituting the strand to be inspected, or are connected to the strand to be inspected and the ground wire. I do.

In the conduction check mode, when a DC voltage is supplied from the battery 1 to the supply path B, the supply path B → the LED 5 →
When a current flows through the path of the resistor R1, the supply path A, the connection terminal 9, the element wire to be inspected, the connection terminal 10, and the ground 11, and when there is no abnormality such as disconnection in the element wire to be inspected, the LED 5 is turned on.

Thus, the continuity of the wires of the cable can be checked.
Unlike in the oscillation mode in which 5 and 6 alternately blink, the LED 5, which is one of the LEDs, is turned on, so that the LED 5 can be easily distinguished from the oscillation mode. Further, since the emission colors of the LEDs 5 and 6 are different, the oscillation mode and the continuity check mode can be more easily distinguished.

The common contact 20 of the changeover switch 2
In the polarity check mode, which is a non-supply mode in which is connected to the individual contact 22, the oscillation signal from the oscillation circuit 7 and the DC voltage from the battery 1 are not supplied to the supply paths A and B. In this state, when the modular plug 34 used as the connection terminals 9 and 10 is connected to a modular outlet provided in a wiring path such as an ISDN, the lighting state of the LEDs 5 and 6 differs depending on the polarity of the wiring path.

That is, when the high potential side of the wiring path is connected to the connection terminal 9 and the low potential side of the connection path is connected to the connection terminal 10, the connection terminal 9 → supply path A → resistance R1 → LED6 → supply path B → resistance R2 → connection terminal A current flows in the order of 10, and the LED 6 is turned on. When the high potential side of the wiring path is connected to the connection terminal 10 and the low potential side of the connection terminal 9 is connected, the connection terminal 10 →
Resistance R2 → supply path B → LED5 → resistance R1 → supply path A →
The current flows in the order of the connection terminals 9, and the LED 5 is turned on.

As described above, since the lighting state of the LEDs 5 and 6 changes according to the polarity of the wiring path connected to the connection terminal 9 and the connection terminal 10, the polarity of the wiring path can be inspected from the lighting state. . Further, since the emission colors of the LEDs 5 and 6 are different from each other, it is possible to easily determine the polarity based on the lighting state and the emission color of the LEDs 5 and 6.

[0026]

According to a first aspect of the present invention, there is provided a transmitter for detecting a cable strand, comprising: a DC power supply; and an oscillating circuit which receives a DC voltage from the DC power supply and supplies an oscillation signal having a predetermined frequency at predetermined intervals. And a cable element search transmitter for supplying an oscillation signal from the oscillation circuit between two elements to be searched among a plurality of elements of the cable or between one element and ground. Since a booster circuit for boosting the DC voltage from the DC power supply to a predetermined voltage is provided between the DC power supply and the oscillation circuit, the DC voltage from the DC power supply is boosted by the booster circuit, and the boosted voltage is applied. Since the oscillation circuit receives a voltage and supplies an oscillation signal of a predetermined frequency from the oscillation circuit to the strand to be searched for the cable, the level of the oscillation signal to be supplied becomes high, and the element of the cable can be used without using a DC power supply having a large capacity. Can easily reach the signal to the terminal, it can be miniaturized transmitter.

According to a second aspect of the present invention, there is provided the transmitter for detecting a cable strand according to the first aspect, wherein the oscillation circuit receives a voltage boosted by the boosting circuit, and An oscillation mode in which an oscillation signal is supplied between two strands to be searched or between one strand and the ground, and between two strands to be inspected from the DC power supply without passing through the booster circuit. Alternatively, a switching switch for switching between a continuity check mode in which a continuity check is performed by supplying a DC voltage between one strand and the ground and checking the continuity of the strand to be inspected is provided between the DC power supply and the booster circuit. A capacitor for removing a DC component of a signal is connected to the oscillation circuit, and in the oscillation mode, a DC component output from the oscillation circuit via the capacitor is removed. Between the supply path of the vibration signal and the supply path of the DC voltage supplied from the DC power supply through the changeover switch in the continuity check mode so that the lighting state differs according to each of the modes. Since at least two separate light-emitting elements are provided in parallel with each other so as to have opposite polarities, it is possible to check the continuity of the wires of the cable, and in the oscillation mode, an oscillation signal of a predetermined frequency from which a DC component has been removed. Accordingly, the light emitting elements provided in different colors and provided in opposite polarities alternately blink, and only one of the light emitting elements is turned on in the conduction check mode. Therefore, depending on the lighting state of the light emitting element and the light emitting color, either mode is selected. Can be easily determined.

According to a third aspect of the present invention, in the transmitter for detecting a cable strand according to the second aspect, the changeover switch includes a supply path for the oscillation signal and a supply path for a DC voltage. In the non-supply mode, an external wiring is provided for each of the oscillation signal supply path and the DC voltage supply path. A signal from the path is supplied, and in order to inspect the polarity state of the wiring path by changing the lighting state of each light emitting element according to the signal, the polarity of the wiring path is determined by the lighting state and the emission color of each light emitting element. It can be easily inspected.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a cable strand search transmitter according to the present invention.

FIG. 2 is a perspective view showing an appearance of a transmitter for cable strand detection according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Changeover switch 3 Step-up circuit 4 Step-up IC 5 LED 6 LED 7 Oscillation circuit 9 Connection terminal 10 Connection terminal

Claims (3)

[Claims] 1. A power supply comprising: a DC power supply; and an oscillation circuit that receives a DC voltage from the DC power supply and supplies an oscillation signal of a predetermined frequency at predetermined intervals. A cable strand search transmitter for supplying an oscillation signal from the oscillation circuit between two strands or between one strand and the ground, wherein the DC power source is provided between the DC power source and the oscillation circuit. A transmitter for detecting cable strands, comprising a booster circuit for boosting a DC voltage to a predetermined voltage. 2. An oscillation mode in which the oscillation circuit receives a voltage boosted by the boosting circuit and supplies an oscillation signal between two strands to be searched or between one strand and ground. A DC voltage is supplied from the DC power supply between two strands of the cable to be inspected or between one strand and the ground without passing through the booster circuit to check the continuity of the strand to be inspected. A changeover switch for switching between a conduction check mode to be performed is provided between the DC power supply and the booster circuit, and a capacitor for removing a DC component of a signal is connected to the oscillation circuit. A supply path for an oscillation signal from which a DC component is output via a capacitor, and a supply path from the DC power supply via the changeover switch in the conduction check mode. Between the DC voltage supply path
2. The device according to claim 1, wherein at least two color-coded light-emitting elements are connected in parallel so as to have opposite polarities so that a lighting state differs according to each mode.
A transmitter for cable strand exploration as described. 3. The switch according to claim 1, wherein the changeover switch is configured to switch to a non-supply mode in which the oscillation signal and the DC voltage are not supplied to the oscillation signal supply path and the DC voltage supply path. In the mode, each of the supply path of the oscillation signal and the supply path of the DC voltage,
3. The cable strand search according to claim 2, wherein a signal is supplied from an external wiring path, and the lighting state of each of the light emitting elements is changed according to the signal to check the polarity state of the wiring path. For transmitter.