JPH0829474A - Wiring testing device - Google Patents

Abstract

PURPOSE:To enable wiring errors such as polarity error to be readily detected by connecting a voltage application unit to one end of wiring for the purpose of applying different DC voltages to stranded wires, and connecting a detecting unit to the other end for the purpose of detecting and ' displaying the magnitude and polarity of the voltage applied to each stranded wire. CONSTITUTION:A voltage unit 1 is connected to a connector 5a located at one end of wiring consisting of a pair of stranded wires 4a, 4b, and low and high voltages are supplied, respectively, to the pair of stranded wires 4a, 4b from respective power supplies 1a, 1b. In a detecting unit 2, a red light-emitting diode 7a which is turned on by a Zener diode 6 only at a high voltage, and a green light-emitting diode 7b which is turned on at both low and high voltages are connected to the stranded wire 4a, and a diode 7b which is turned on by the diode 6 only at a high voltage is connected to the stranded wire Xb. When a normal connection is achieved between the stranded wires 4a, 4b at a connection point 3, the two diodes 7b are both turned on, while in the case of wrong connection the diodes 7a, 7b are either turned on or off according to the kind of wrong connection. The kind of wrong connection can be identified according to the combination of the on and off diodes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring test apparatus, and more particularly to a wiring test apparatus for testing wiring of unshielded twisted pair wires installed in offices and the like.

[0002]

2. Description of the Related Art In recent offices, office automation equipment such as multifunction telephones and personal computer LANs are becoming widespread, and wiring for these equipment is installed under the floor in anticipation of future expansion when the office is opened. The so-called pre-wiring is increasing. A configuration example of this pre-wiring will be described with reference to FIG. That is, from one or a plurality of wiring boards 11 installed in the office, multi-strand twisted pair cables 13 are radiated in advance at various points in the office under the floor 10 to the connection points 14, and the connection points 14 1 to be placed on the floor later from
The two or the like is wired by the twisted pair cable 15. At both ends of the wiring board 11 and the desk 12, it is common to connect two pairs of wiring by one connector 17.
Since such pre-wiring saves the cost and labor of the work for the extension, it has an advantage that the cost can be reduced in the long term, and is widely used in recent office buildings.

Since one or a plurality of connection points 14 are provided for branching between the wiring board 11 and the desk-top connector 17, it is necessary to confirm the connection after the completion of construction. Normally, as shown in FIG. 5, at each end of the wiring, each twisted pair of wires 13 is shorted and opened by a wire 18,
It is generally verified by testing continuity with a tester 16 at the other end.

[0004]

However, in the above-mentioned conventional connection confirmation method, if the polarity at the connection point 3 is erroneously connected as shown in FIG. 2A, it cannot be detected. There is. If the polarity is incorrect, communication may not be possible in the personal computer LAN, and in this case, it takes time to identify the failure point, which may cause a large amount of damage such as business interruption. Further, in the conventional test method, it is necessary to arrange a tester at each end of the wirings located apart from each other, which causes a problem that manpower is required.

The present invention has been made in view of the above circumstances, solves the problems of the prior art described above, can easily detect wiring mistakes such as polarity error, and can be operated by one inspector. It is an object of the present invention to provide a test device capable of performing a test in.

[0006]

SUMMARY OF THE INVENTION According to the present invention, in a wiring test apparatus comprising one or a plurality of pairs and having connectors attached to both ends, different DC voltages are connected to one pair of the wirings and connected to one end of the wiring. The wiring test apparatus comprises a voltage application unit for applying a voltage and a detection unit connected to the other end of the wiring for detecting and displaying the magnitude and polarity of the voltage applied to each twisted pair. The wiring test apparatus uses a light emitting diode as a means for detecting and displaying the polarity of the voltage and a zener diode as a means for determining the magnitude of the voltage. Further, the light emitting diodes showing a normal voltage are all the same specific color, and the light emitting diodes showing an abnormal voltage are a color different from the specific color.

[0007]

[Function] By connecting the voltage application unit to one end of the wiring to apply different DC voltage and connecting the detection unit to the other end of the wiring to detect the voltage and polarity, it is possible to easily inspect the wiring error by one person. It becomes possible for a member to reliably detect it.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of the wiring test apparatus.
The pair of twisted wires 4a and 4b is composed of a voltage unit 1 connected to a connector 5a at one end and a detection unit 2 connected to a connector 5b at the other end of the wire. The voltage unit 1 has two power sources 1 for applying different DC voltages of low voltage and high voltage to the wirings 4a and 4b.
It incorporates a and 1b. On the other hand, the detection unit 2
In the wiring consisting of the twisted pair wire 4a to which a low voltage is to be applied, a red light emitting diode 7a that lights only at a high voltage by the Zener diode 6 and a green light emitting diode 7b that lights at a high voltage or a low voltage are provided. A pair of twisted wires 4b which are connected in parallel via a resistor 8 and to which a high voltage should be applied, are connected by a Zener diode 6 to a green light emitting diode 7b which is turned on only when a high voltage is applied via a resistor 8. Has been done.

Therefore, when the two twisted wires 4a and 4b are normally connected at the connection point 3 as shown in FIG. 1, both of the green light emitting diodes 7b are turned on. In the case of disconnection or poor contact, the green light-emitting diode 7b of the corresponding wiring does not light up, and therefore it can be detected.

Next, in the case of erroneous connection, in the case of the connection having the wrong polarity at the connection point 3 as shown in FIG.
Since the reverse voltage is applied to all the light emitting diodes 7a and 7b, they do not light up. This allows erroneous connections to be detected.

When the pair of twisted wires 4a and 4b at the connection point 3 shown in FIG. 2 (b) are erroneously connected to each other, a high voltage is applied to a circuit to which a low voltage is to be applied, so that a red color is applied. Both the green light emitting diodes 7a and 7b are turned on. Further, in the circuit 4b to which the high voltage is applied, the low voltage is applied, so that the light emitting diodes 7a, 7a
b does not light. This can be detected. In this way, all wiring errors that are likely to occur can be detected.

According to the present invention, both the voltage application unit 1 and the detection unit 2 can be constituted by only simple parts such as a DC voltage application circuit (battery), a light emitting diode, a Zener diode, a resistor, etc. It is possible to provide a highly reliable wiring test device. Further, the determination as to whether or not it is normal can be easily made because it is sufficient to confirm that all the green light emitting diodes 7b are turned on and none of the red light emitting diodes 7a are turned on.

Next, a modified example will be described with reference to FIG.
This is one in which the voltage unit 1'is connected to a plurality of connectors 5 '. That is, the voltage unit 1'is installed on the wiring board side and is connected to the plurality of connectors 5, 5'in advance. Since a tester is not required for the voltage application unit 1'side, the tester can check and judge the wiring around the connector 3 on the desk by himself on the detection unit 2 side. It becomes possible to do.

The above example has been described for the case of a connector having two pairs of twisted wires, but the present invention is not limited to this. Further, by increasing the types of voltage applied to the voltage applying unit and the number of light emitting diodes in the detecting unit, those skilled in the art can easily expand the connector to a twisted wire connector having three or more pairs.

[0015]

As described above, according to the wiring test apparatus of the present invention, it is possible to provide inexpensive and highly reliable means for easily detecting a wiring error that is usually likely to occur.
Further, by using the voltage application unit for multiple connectors, the number of inspectors can be reduced from two to one, and the work efficiency can be significantly improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a wiring test apparatus according to an embodiment,

2A and 2B are diagrams showing examples of connection mistakes at connection points,

FIG. 3 is a circuit diagram showing a configuration of a wiring test apparatus of a modified example,

FIG. 4 is a perspective view showing a configuration example of pre-wiring.

FIG. 5 is an explanatory diagram for explaining an inspection state of a conventional wiring test apparatus.

[Explanation of symbols]

 1,1 'Voltage application unit 1a, 1b DC power supply 2 Detection unit 3,14 Connection point 4a, 4b, 13 Pair twisted wire (wiring) 5,5a, 5b, 5'Connector 6 Zener diode 7a, 7b Light emitting diode (red , Green) 8 resistance 11 wiring board 12 desks

Claims (3)

[Claims] 1. A test apparatus for wiring, which comprises one or a plurality of twisted wires and has connectors attached at both ends, and a voltage applying unit which is connected to one end of the wires and applies a different DC voltage to each twisted wire. A wiring test apparatus comprising: a detection unit connected to the other end of the wiring to detect and display the magnitude and polarity of the voltage applied to each twisted pair. 2. The wiring test apparatus according to claim 1, wherein
A wiring test apparatus characterized in that a light emitting diode is used as a means for detecting and displaying a polarity of a voltage and a Zener diode is used as a means for discriminating the magnitude of the voltage. 3. The wiring test apparatus according to claim 1 or 2, wherein all the light emitting diodes showing a normal voltage have the same specific color, and the light emitting diodes showing an abnormal voltage have a color different from the specific color. Characteristic wiring test equipment.