JPH07231284A - Power line carrier system between measurement instruments - Google Patents

Abstract

PURPOSE:To attain correct and efficient measurement by providing a power carrier section to each measurement instrument and plugging in a power plug of a power line for the measurement instrument to a receptacle tap with a block filter integrated thereto and implementing data communication between plural measurement instruments. CONSTITUTION:A power plug 17 (a, b, c) of each measurement power line 13 (a, b, c) is plugged into a receptacle of a tap 12 in a carrier system 10 and a plug 21 of a power supply side external power line 20 is plugged into a receptacle of a prescribed external power supply. Thus, power is supplied to a power supply section 14 (a, b, c) of each measurement instrument (a, b, c) to activate each measurement instrument 11. Thus, each measurement equipment 11 uses a measurement instrument side power line communication section (a, b, c) to superimpose a high frequency signal onto the measurement instrument power line 13 via the power line communication section 15 (a, b, c) to attain mutual communication. Then the objective measurement environment is simply formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line carrier system between measuring devices for performing data communication between devices such as measuring devices connected to a common power source.

[0002]

2. Description of the Related Art In recent years, measurement has become more and more important for legal regulation or maintenance of system functions. Conventionally, when performing predetermined measurements using multiple measuring instruments or measuring instruments such as control devices, command control and data transfer between measuring instruments and measuring instruments or between measuring instruments and control devices, etc. Is usually a GP-IB (General Purpose Interface Bu
The measurement environment was created by connecting with a communication cable using the interface for measuring instruments known as s). FIG. 3 shows a connection state of communication cables between conventional measuring instruments and control devices. A plurality of communication cables 3 are provided between a plurality of measuring instruments 2, ... , ... are connected.

[0003]

However, in the conventional connection between measuring instruments by a communication cable, when the purpose or object of measurement changes, the measuring instruments and control devices may be recombined or the measuring instruments and control devices may be connected to each other. Since it is necessary to reconnect the communication cables of No. 3, the connection work is complicated, and when there are many cables to be connected, there is a possibility that a wrong connection or a poor connection may occur.

Incidentally, for example, Japanese Patent Laid-Open No. 61-128633.
Japanese Patent Publication discloses a technique relating to a power line carrier system in which a carrier control signal from a transmitter is superimposed on an indoor power line and carried, and a controlled load on the receiver side is controlled, but many measurements are made. It does not create a measurement environment for data transmission between devices.

[0005] Therefore, an object of the present invention is to provide a power line carrier system between measuring devices which can easily make a measuring environment according to the purpose and object of the measurement and can perform the measurement correctly and efficiently.

[0006]

In order to achieve the above object, a power line carrier system between measuring instruments according to the present invention provides a plurality of measuring instruments operating on a common power source with data signals on respective measuring instrument side power lines. In addition to providing a power transfer unit and a data input / output unit for superimposing and transmitting between the measuring instruments, the power plugs provided on the measuring instrument side power lines are connected to the common power source side external power line. A tap filter is provided, and a block filter for preventing leakage of a data signal superimposed on the measuring instrument side power supply line to the power supply side external power line is incorporated in the tap.

The measuring device preferably includes a control device or peripheral devices in addition to the measuring device. Further, it is preferable that the measuring device is housed in a rack.

[0008]

In the power line carrier system between measuring devices according to the present invention, each measuring device is provided with a power carrier unit and a data input / output unit, and the power plug of the measuring device side power supply line is connected to the power source side external power line. By having a mouth and plugging it into a tap with a built-in block filter and performing data communication between multiple measurement devices, you can easily create a measurement environment according to the purpose and target of measurement, and make measurement accurate and efficient. The data signal does not leak to the outside.

By including the control device or the peripheral device in the measuring device, data communication can be freely performed between the measuring device and the control device or the peripheral device. In addition, by storing the measurement equipment in the rack, you can create a measurement environment by simply inserting the power plug into the tap's insertion port, eliminating the need for complicated connection work.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings. FIG. 1 is a diagram for explaining the overall configuration of a power line carrier system between measuring devices according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the appearance of a tap used in the embodiment of the present invention.

In these figures, a power line carrier system 10 between measuring devices of the present embodiment performs data communication by power line carrier between a plurality of measuring devices including a measuring instrument, a control device, peripheral devices, etc. It is composed of measuring instruments 11a, 11b, 11c that operate with a common external power source, one tap 12 having a plurality of insertion ports 18 ,. These measuring instruments 11a, 11b and 11c are power supply units 14a, 14b and 14c and a power line communication unit 1 which are connected to the measuring device side power lines 13a, 13b and 13c, respectively.
5a, 15b, 15c and these power line communication units 15a,
Data input / output units 16a, 1 connected to 15b, 15c
6b, 16c, and power plugs 17a, 17b, 17c provided at the ends of the measuring-device-side power lines 13a, 13b, 13c, respectively.
8, ...

The power line communication section 15 (a, b, c) is a section for transmitting and receiving data by superimposing a high frequency signal on the power line, and the data input / output section 16 (a, b, c) measures each of them. Power line communication unit 15 (a, b,
This is a part for inputting / outputting data via c). The tap 12 has a plurality of insertion ports 18, ... Branched from one power source side external power line 20 inside, and a high frequency signal superimposed on the measuring instrument side power line 13 (a, b, c) is on the power source side. A block filter 19 for preventing leakage to the external power line 20 is incorporated, and this block filter 1
A power supply side external power line 20 for connecting to a common external power supply via 9 is provided, and a power supply plug 21 is provided at an end of the power supply side external power line 20. The block filter 19 is a filter that attenuates high frequency components, and is formed of a resonance circuit including a capacitor, a coil, and the like.

In the power line carrier system 10 between the measuring instruments having the above-mentioned structure, the power plugs 17 (a, b, c) of the measuring instrument side power lines 13 (a, b, c) of the respective measuring instruments 11 (a, b, c).
c) is inserted into the insertion ports 18 of the tap 12, and the plug 21 of the power supply side external power line 20 is inserted into the insertion port of a predetermined external power source.
Power can be supplied to the power supply unit 14 (a, b, c) of c) to operate each measuring device 11 (a, b, c), and each measuring device 11 (a, b, c) The measuring equipment side power lines 13 (a, b, c) are mutually connected to the power line communication unit 15 (a,
b, c), command control and data are input / output section 16 (a, b, c) and power line communication section 15
Measuring device side power line 13 (a, b, c)
High-frequency signals can be superimposed on b, c) to communicate with each other, and a desired measurement environment can be easily created. That is, usually, depending on the object of measurement, the DUT is moved to the vicinity of the measuring device, or the measuring device is moved to the vicinity of the measuring device.Both of them conventionally require cable connection work between the measuring devices. However, in the present embodiment, it is necessary to connect the rear surfaces of the respective measuring instruments 11 (a, b, c) with a communication cable by performing data communication using the measuring instrument side power line 13 (a, b, c). And the number of cables can be reduced,
In addition, the reassembling of the measuring device can be simplified.

In addition, usually each measuring device 11 (a, b, c)
Are often collectively stored in a rack or the like for use, but the power plugs 17 (a, b, c) of the measuring instrument side power lines 13 (a, b, c) are collectively put in the insertion port 18 of the tap 12. , And the block filter 19 is incorporated, the measuring instrument side power line 13 (a,
The high frequency signal superimposed on b, c) will not leak to the outside and adversely affect external equipment.

In the above embodiment, the measuring device 11
Although (a, b, c) has been described as an example, a control device or peripheral equipment required for measurement may be included.

Although the preferred embodiment of the present invention has been described, it goes without saying that various improvements and modifications can be made without departing from the spirit of the present invention.

[0017]

As described above, according to the present invention, each measuring equipment is provided with a power carrier, and the power plug of the measuring equipment side power line is inserted into a tap incorporating a block filter to allow data communication between a plurality of measuring equipment. By doing
The measurement environment can be easily created according to the purpose and object of the measurement, and the measurement can be performed correctly and efficiently.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an overall configuration of a power line carrier system between measuring devices according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an appearance of a tap used in the embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which conventional measuring instruments and control devices are housed in a rack and connected to each other by a communication cable.

[Explanation of symbols]

 10 Power line carrier system between measuring instruments 11a, 11b, 11c Measuring instrument 12 Taps 13a, 13b, 13c Measuring instrument side power line 14a, 14b, 14c Power supply section 15a, 15b, 15c Power line communication section 16a, 16b, 16c Data input / output section 17a, 17b, 17c Power plug 18 Insert port 19 Block filter 20 Power supply side external power line 21 Power plug

Claims (3)

[Claims] 1. A power carrier section and a data input / output section for superimposing a data signal on each measuring instrument side power supply line and transmitting / receiving between the measuring instruments are provided on a plurality of measuring instruments operating on a common power source, To the power supply side external power line of the data signal superimposed on the measurement device side power supply line, the power supply plug provided on each measurement device side power supply line is provided with a tap having an insertion port connected to a common power supply side external power line A power line carrier system between measuring instruments, in which a block filter for preventing the leakage of water is incorporated in the tap. 2. The power line carrier system between measuring devices according to claim 1, wherein the measuring device includes a control device or peripheral devices in addition to the measuring device. 3. The power line carrier system between measuring devices according to claim 1, wherein the measuring devices are housed in a rack.