JPH0658969A - Three-dimensional jamming measuring apparatus - Google Patents

Abstract

PURPOSE:To obtain an EMI measuring apparatus which can measure three- dimensional noise in X, Y and Z directions (front and rear) for a printed wiring board mounting electronic component abundant of unwanted radiation. CONSTITUTION:In order to measure noise source of a printed wiring board mounting electronic component abundant of unwanted radiation, an EMI measuring apparatus sets a printed wiring board 3 firmly to three-dimensional X-Y-Z tables 4, 5, 6 and stores measuring data on the front side into a memory and processes the front side measuring data together with rear side measuring data. This constitution allows measurement of magnetic field strength distribution of unwanted three-dimensional radiation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic interference measuring device (electromagneti) used for measuring a noise source of a printed wiring board on which electronic components with a lot of unwanted radiation are mounted.
c interference: hereinafter referred to as an EMI measuring device).

[0002]

2. Description of the Related Art FIG. 3 is a perspective view of a conventional EMI interference measuring device. In the conventional EMI disturbance measuring apparatus, the printed wiring board 3 is set in the disturbance measuring antenna 3 having a structure having a coil winding 10 only in the vertical direction, and the conventional EMI disturbance measuring apparatus will be described below with reference to the drawings. An example will be described.

As shown in FIG. 3, 9 is an interference measuring antenna. Reference numeral 10 is a vertical coil, and 2 is an interference measuring instrument. The vertical coil 10 is formed by ensuring electrical conduction by a through hole of a pattern provided in each layer on the printed wiring board inside the interference measuring antenna. The vertical coil 10 makes it possible to detect the magnetic field of a printed wiring board on which electronic components with a large amount of unwanted radiation are mounted. The noise can be measured by connecting the interference measuring antenna 9 to the interference measuring device 2. As a result, if the printed wiring board has a size within the range of the interference measurement antenna 9, it is possible to perform planar electromagnetic interference measurement in the XY directions.

[0004]

However, in the above-mentioned conventional configuration, when measuring the noise source of the printed wiring board on which the electronic components with a large amount of unwanted radiation are mounted, the noise source in the XY direction is measured with respect to the printed wiring board. There is a problem in that only noise due to planar unwanted radiation can be measured.

The present invention solves the above-mentioned problems of the prior art. For a printed wiring board on which electronic components with a large amount of unwanted radiation are mounted, not only the XY plane but also the Z including both the front and the back.
E that can measure directional or three-dimensional noise
An MI measuring device is provided.

[0006]

In order to achieve this object, the EMI measuring device of the present invention uses a three-dimensional XYZ table.
The printed wiring board is set so that its position does not shift, and the intensity distribution of the magnetic field of unwanted radiation is measured. The data measured on the front side is stored in the memory, and then the back side is measured. This makes it possible to measure the three-dimensional distribution by measuring the noise generation source of the printed wiring board on which the electronic component with a large amount of unwanted radiation is mounted, separately on the back and front.

[0007]

The EMI interference measuring device according to the present invention has the following effects. When measuring the noise source of a printed wiring board on which electronic components with a lot of unwanted radiation are mounted, measure the noise due to unwanted radiation in the Z direction including the front and back sides in addition to the XY plane for the printed wiring board. be able to. As a result, it is possible to study the effect of noise due to three-dimensional unwanted radiation around the printed wiring board on the electric circuit, which has not been a problem in the past, and to improve the efficiency of interference countermeasures. be able to.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an XYZ drive table (4 to 4).
The position of the printed wiring board 3 is obtained by inserting the pilot pin 8 provided on the X drive table 4 into the positioning hole 7 of the printed wiring board 3 on which electronic components with a lot of unwanted radiation are mounted. 1 shows the system of the entire apparatus in which the noise is measured from above the printed wiring board 3 by the near magnetic field probe 1 so that the noise is not displaced.

The near magnetic field probe 1 is connected to the disturbance measuring device 2 so that noise can be measured. X-
The Y-Z drive table is placed on the Z-direction drive table 6 in the Y direction.
The directional drive table 5 is placed, and the X-direction drive table 4 is placed on the directional drive table 5. With the printed wiring board 3 on which electronic components with a lot of unwanted radiation are mounted is placed on the XYZ drive table (4 to 6) in a state where the printed wiring board 3 is set at the origin position and above the printed wiring board 3. To measure the noise with the near magnetic field probe 1. By moving the XYZ drive table (4-6) in the X, Y, and Z directions, it is possible to measure the three-dimensional distribution of noise due to unnecessary radiation generated from the printed wiring board 3. Becomes

[0011]

As described above, the EMI measuring apparatus according to the present invention can measure noise due to three-dimensional unwanted radiation in the Z direction including the front and back sides in addition to the XY plane for the printed wiring board. Therefore, it is possible to efficiently find the influence of noise due to unnecessary radiation on the electric circuit, and further improve the reliability of the product and shorten the noise measurement time.

[Brief description of drawings]

FIG. 1 is a perspective view of an EMI measuring device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a conventional EMI measuring device.

[Explanation of symbols]

 1 Near magnetic field probe 2 Interference measuring device 3 Printed wiring board 4 X-direction drive table 5 Y-direction drive table 6 Z-direction drive table 7 Positioning hole for printed wiring board 8 Pilot pin

Claims (1)

[Claims] 1. A magnetic field of unnecessary radiation generated from a printed wiring board on which electronic components are mounted is three-dimensionally detected,
The printed wiring board is set on the three-dimensional XYZ table, the intensity distribution of the magnetic field of unnecessary radiation is measured from above the printed wiring board by the near magnetic field probe, and the data is measured. Electromagnetic interference measurement in which the intensity distribution of the magnetic field of the unwanted radiation on the front and back sides can be measured by storing it in a memory in the memory, then reversing the printed wiring board to perform the same measurement and recalling the contents of the memory apparatus.