JPH0620144Y2 - Wireway searcher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a wiring path finder for a low-voltage wiring path.

[Conventional technology]

There is a method shown in FIG. 3 as one of the methods for searching the low voltage wiring path. In the figure, 20 is a low-voltage distribution line, and 21 and 22.
No. 1 and No. 2 system breakers, 23 and 24 are No. 1 and No. 2 system wiring paths, and 25 and 26 are No. 1 and No. 2 system outlets, respectively.

As a method for searching which breaker the No. 2 outlet 26 is connected to in FIG. 3, the No. 2 outlet 26 is connected to a transmitter 27 consuming a current of a specific frequency, for example, 5 kHz.

As a result, the line 2 to which the No. 2 outlet 26 is connected
5kHz current flows through 4.

The magnetic flux generated by this current is detected by the magnetic flux detecting coil 29 built in the receiver 28, amplified by the amplifier 30, and passed through the bandpass filter 31 of 5 kHz. With this, the strength of the magnetic flux due to the current of 5 kHz can be measured.

The output of the bandpass filter 31 is the voltage detection and display 32.
Applied to the LE, depending on the output of the bandpass filter 31.
D33 lights up. The output of the bandpass filter 31 is also applied to the buzzer 34, so the buzzer 34
Sounds with strong and weak sounds.

In other words, 5k depending on the number of LEDs 33 and the buzzer 34
The strength of the magnetic flux due to the Hz current can be measured.

Since the current of 5 kHz is flowing through the No. 2 line 24, the magnetic flux is also strong. Therefore, many LEDs 33 are turned on and the buzzer 34 also emits a strong sound. However, since the current of 5 kHz does not flow through the No. 1 line 23, the LEDs 33 are not lit or the number thereof is small even if lit. The buzzer 34 also does not ring or it rings weakly. From this, it can be seen that the No. 2 line 24 is the line to which the transmitter 27 is connected.

[Problems to be solved by the device]

The method shown in FIG. 3 makes it easy to see which breaker this outlet is connected to, or which outlet is connected to this breaker.

However, when checking a wiring path, there are many opportunities to check not only the wiring path but also the continuity.

For example, (1) Is the power supplied only halfway, but is the wire broken?

(2) The light does not turn on, but it may be broken.

(3) The electromagnetic switch does not work, but is the coil broken?

(4) The light does not turn on even when the tumbler switch is turned on.
Is the tumbler switch conducting?

In this case, a wiring path finder and a tester or a continuity buzzer are required, and the cost burden is large when preparing these. In addition, when carrying out wiring work, many tools such as a driver are carried, and in addition, adding one measuring instrument will increase the amount of luggage, which will increase the bulk and weight, which is a heavy burden. It was

An object of the present invention is to solve such a conventional problem and to enable a wiring path and various continuity checks only with a wiring path searcher.

[Means for Solving the Problems]

In order to achieve this object, the wireway searching device of the present invention detects a transmitter that causes a current having a specific frequency to flow through the wireway, and a magnetic flux generated by the current having the specific frequency to detect the desired wireway. In the wiring path searcher including a receiver for searching, in the receiver, two continuity check terminals, and means for measuring the magnitude of the resistance value of a circuit connected between the continuity check terminals, It is characterized in that it is provided with an indicator for displaying the magnitude of the measured resistance value.

[Action]

In the present invention, since the continuity check function is built in the wire path searching device, the resistance between circuits, that is, the continuity state is displayed on the display by connecting the circuit between the continuity check terminals, and the continuity state is displayed. You can check.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing an embodiment of the receiver of the wire route searching device.

1 is a coil for detecting magnetic flux, 2 is an amplifier, 3 is a band pass filter, 4 is an OR circuit, 5 is a voltage detection and a voltage detection and indicator for lighting an LED according to an input voltage, 6 is an LED, 7 is Buzzer, 8 is oscillator, 9 is differential amplifier, 10
Is an ideal diode circuit using an operational amplifier.

Now, assuming that the coil 1 is brought close to a wiring path in which a current of 5 kHz is flowing, a voltage of 5 kHz is induced in the coil 1.

This voltage is amplified by the amplifier 2 and applied to the bandpass filter 3. Here, only the voltage of 5 kHz is taken out.

This voltage passes through the OR circuit 4 and is applied to the voltage detection / display unit 5 and the buzzer 7.

The voltage detection and display 5 turns on the LED 6 according to the input voltage. Further, the buzzer 7 also sounds in a strong and weak tone according to the input voltage.

That is, the intensity of the magnetic flux of 5 kHz can be measured by the number of lights of the LED 6 and the intensity of the buzzer sound.

On the other hand, regarding the operation of the continuity check unit, the differential amplifier 9 is an amplifier that outputs the difference between the + input and the − input, and outputs the difference between the voltage at the point a and the voltage at the point b to the signal c. The oscillator 8 has a constant voltage V ₁
Is being output. DUT, that is, resistance R is unknown
_The circuit represented by _x is connected between the continuity check terminals 12a and 12b, that is, between the point B and the ground.

Therefore, the voltage V _{2 at the} point B is determined by the power supply voltages V _s , R, and R _x .

The output voltage V ₃ of the differential amplifier 9 is the difference between the points A and B, so that V ₃ = V ₁ −V ₂ .

Now consider V ₁ = 1 (V), V _s = 10 (V), R = 10 kΩ, and operation when R _x is connected to resistors of 0 Ω, 1 kΩ, and 10 kΩ and when it is open (resistance ∞). View.

When R _x = 0Ω, V ₂ = 0 (V), and therefore V ₃ = V ₁ −V ₂ = 1-0 = 1 (V).

This voltage is applied to the voltage detection and display 5 and the buzzer 7 through the ideal diode circuit 10 and the OR circuit 4.

As a result, the LED 6 is turned on, but in this case, 10 LEDs are turned on, and the buzzer 7 also sounds with an intensity corresponding to 1 (V).

If R _x = 1 kΩ, V become _{3 = V 1 -V 2 = 1-0.9} = 0.1 (V).

Therefore, one LED 6 is lit, corresponding to 0.1 (V). Buzzer 7 also sounds with a strength corresponding to 0.1 (V).

If R _x = 10 kΩ, V become _{3 = V 1 -V 2 = 1-5} = -4 (V).

In the case of a negative voltage, since the ideal diode 10 is present, the voltage detected and applied to the display 5 and the buzzer 7 is 0, and the LED 6 does not light up. Buzzer 7 also does not ring.

When R _x = ∞ (open), V ₂ = 10 (V) V ₃ = V ₁ −V ₂ = 1-10 = −9 (V).

Since it is a negative voltage, LED6 does not light. Buzzer 7 also does not ring.

It should be noted that the output of the oscillator 8, that is, the intermittent output is applied to the + input of the differential amplifier 9 instead of the DC voltage, because the buzzer 7 does not ring even when a DC voltage is applied, and the AC or intermittent This is because a so-called speaker type buzzer that sounds when an output is applied is used.

The reason why the speaker type buzzer is used is that the wiring path searching unit applies a signal of 5 kHz so that the buzzer sounds. Therefore, a so-called self-excited buzzer that applies a DC voltage and sounds is inconvenient.

Since the intermittent output is also applied to the input of the voltage detection / display unit 5, the LED 6 is also intermittently lit.

However, since the oscillator 8 normally oscillates at several kHz, it looks like continuous lighting to the eyes.

As described above, the number of lit lamps changes according to the value of R _x , and the intensity of the buzzer sound also changes.

In this example, the lamp lights up and the buzzer sounds in the range of 0 to 1 kΩ, but it can be seen that the lamp does not light up and the buzzer does not sound when the resistance is higher than that. Further, the resistance value R _x versus the number of lamps to be lit can be freely set by adjusting V ₁ , V _s and R as can be seen from the above equation.

As described above, a conduction buzzer capable of displaying a rough resistance value can be realized simply by adding a differential amplifier, an oscillator, an ideal diode circuit, an OR circuit, and a resistor.

The voltage detection and display, LED group, buzzer, DC power supply, etc. can be shared with those of the wiring path searcher, so it is not necessary to prepare them separately.

In other words, since it can be used in many places, it can be made cheaper than making a continuity check device separately, and the outer shape is smaller than two.

FIG. 2 is an external view of the embodiment shown in FIG. 11 is an LED,
12 is a continuity check terminal, 13 is a buzzer, and 14 is a test switch.

[Effect of device]

As described above, in the present invention, the receiver of the wireway searching device has a built-in continuity check function, so when checking the wireway, the circuit can be connected by connecting the circuit between the terminals for checking the continuity of the receiver. Since the resistance can be displayed on the display and it is possible to check the conduction state,
There is no need to carry both a wireway searcher and a tester,
Since only one wire route searcher is required, the purchase cost is reduced and the luggage is reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the receiver of the wireway searching device of the present invention, FIG. 2 is a front view showing an embodiment of the receiver of the wireway searching device of the present invention, and FIG. It is a connection diagram which shows the check method of the wiring path by a transmitter and a receiver. 1: Magnetic flux detection coil 2: Amplifier 3: Bandpass filter 4: OR circuit 5: Voltage detection and display 6: LED 7: Buzzer 8: Oscillator 9: Differential amplifier 10: Diode circuit 11: LED 12: For continuity check Terminal 13: Buzzer 14: Test switch

Claims (1)

[Scope of utility model registration request] 1. A wiring path search comprising a transmitter for supplying a current of a specific frequency to the wiring path and a receiver for detecting a magnetic flux generated by the current of the specific frequency to search for a target wiring path. In the receiver, the receiver has two continuity check terminals, a means for measuring the magnitude of the resistance value of a circuit connected between the continuity check terminals, and a display for displaying the magnitude of the measured resistance value. Wiring path search device characterized by having a device.