JPS6385372A - Electromagnetic wave measuring apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A device for measuring electromagnetic waves emitted from an object to be measured such as a printed circuit board or a unit, which includes a plurality of detection sensors on a bottom panel among six sides surrounding the measuring device. The object to be measured is housed in a box made of a detection element and the other five sides are made of a radio wave absorber, and the electromagnetic waves radiated from the object are connected to the output lines (connectors) of the plurality of detection elements. By connecting to an external measuring device such as a frequency analyzer or a level meter, and measuring the electromagnetic waves from each detection element, the distribution of interfering electromagnetic noise (hereinafter referred to as interfering radio waves) can be easily grasped.

[Industrial application field]

The present invention relates to an electromagnetic wave measuring device that makes it possible to easily grasp the distribution of interference waves radiated from an object to be measured such as a printed circuit board or a unit.

In recent years, the development of electronic equipment, especially office equipment that uses magnetic memory, has been remarkable, and there is a tendency for these office equipment to be used together on the same floor, so in order to prevent electromagnetic interference between each other, equipment is generally It has an electrically shielded structure.

However, even with such electrical shielding (electromagnetic shielding), there is a risk of interference from other equipment's radio waves, so equipment that emits electromagnetic waves must be completely electromagnetically shielded. As a countermeasure to this problem, there is a demand for an electromagnetic wave measuring device that can easily measure the distribution of electromagnetic waves from devices that emit electromagnetic waves.

[Conventional technology]

Conventional electromagnetic wave measurements involve receiving electromagnetic waves emitted from electronic equipment using an antenna, and detecting the received radio waves using a frequency analyzer or a measuring device such as a level meter. Measurements are carried out by setting up a ``measurement site'' in a small amount of land (such as a depression in the mountains) or an ``anechoic chamber'' surrounded by radio wave absorbers.

[Problem that the invention seeks to solve]

In the conventional electromagnetic wave measurement mentioned above, the equipment is expensive and the installation location and number of installations are limited, so it is not easy to use, and furthermore, due to limitations on usage time, etc., experiments in the development process are hindered. There was a problem with this.

[Means for Solving the Problems] The present invention solves the above problems and provides an electromagnetic wave measuring device that can easily measure electromagnetic waves radiated from an object to be measured.

That is, a device for measuring electromagnetic waves emitted from an object to be measured is constructed by arranging a plurality of detection elements made of metal electrode plates or coils on one or more panels surrounding the object to be measured. The entire surface other than the element is made of a radio wave absorber, and the output lines of each of the detection elements are connected to an external measuring device to measure the distribution of electromagnetic waves radiated from the object to be measured. This is solved by

[Effect]

The electromagnetic wave measuring device described above consists of a plurality of detection elements on the bottom panel of a box that houses an object to be measured that emits electromagnetic waves, and the other five sides are covered with radio wave absorbers made of metal electrode plates or coils. By using a simple structure surrounded by , and using a plurality of detection elements, it is possible to easily understand the distribution of emitted electromagnetic waves.

〔Example〕

FIG. 1 is a schematic perspective view illustrating an embodiment of the present invention.

A measuring device for measuring electromagnetic waves emitted from an object to be measured 1 such as a printed circuit board or a unit is formed of a box that can accommodate the object to be measured 1, and a metal electrode plate is placed on a panel 3 on the bottom side of the box. Alternatively, a plurality of detection elements 4 (six elements 4a to 4r in the drawing) consisting of coils or the like are arranged in close contact with each other, and the other entire surface is impregnated with, for example, a tile made of ferrite powder sintered into a plate shape or ferrite powder. It is composed of a radio wave absorber 6 such as a wedge-shaped sponge, and the object to be measured 1
The top plate of the radio wave absorber 6 (ceiling Fi
) shall be removable.

Output lines 5 (5a to 5f) such as connectors are drawn out from the detection elements 4 (4a to 4f), respectively.

The removable top plate (ceiling plate) of the electromagnetic wave measurement device having such a configuration is removed, and the device to be measured 1 (the drawing shows a printed circuit board) driven by a power supply and signal line (not shown) is operated. In this state, connect the output lines 5a to 5f of the detection element 6 to the external measuring device 2 in sequence,
Electromagnetic waves radiated from each part of the object to be measured 1 are measured.

In this embodiment, six detection elements 4 are used, but the number is not limited to six, and a plurality of detection elements 4 may be used, but if a precise radiation distribution of electromagnetic waves is required, a large number of detection elements 4 may be used. is preferable. Furthermore, although the explanation has been given for removing the top plate (ceiling plate) of the box in order to take in and take out the object 1 to be measured, the present invention is not limited to the top plate, and may be a side plate. Also, the detection element 4
Although it has been explained that it is used on the bottom side of the box, it may be used on one or more surfaces (the front of the box) depending on the purpose.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, radiated electromagnetic waves can be easily measured and their distribution can be accurately grasped, so that the present invention is extremely effective when applied to electromagnetic wave measurements of equipment in the development process.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view illustrating an embodiment of the present invention. In the figure, 1 is an object to be measured, 2 is an external measuring device, 3 is a panel, 4.4a to 4f are detection elements, and 5.5a to 5
f indicates an output line, and 6 indicates a radio wave absorber. First embodiment of the present invention Fig. 1

Claims (1)

[Claims] A device for measuring electromagnetic waves radiated from an object to be measured (1), comprising one or more panels (3) surrounding the object to be measured (1).
), a plurality of detection elements (4) consisting of metal electrode plates or coils are arranged, and the entire surface of the box other than the detection elements (4) is formed with a radio wave absorber (6), and each of the above-mentioned An electromagnetic wave characterized in that the output line (5) of the detection element (4) is connected to an external measuring device (2) to measure the distribution of electromagnetic waves radiated from the object to be measured (1). measuring device.