JP3048288B2 - Electromagnetic field measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop antenna measuring device for measuring or testing an electromagnetic field.

[0002]

2. Description of the Related Art FIG. 7 shows the International Commission on Interference (CIS).
PR) is a conventional electromagnetic field measuring apparatus of the Bambean method for measuring an electromagnetic field, and 1 is for measuring the X-axis magnetic field strength of the EUT 9. The X-axis loop antenna 2 which passes through the center and is set up perpendicular to the bottom plate 12 and whose circumferential bottom is located 0.5 m away from the bottom plate 12, A Y-axis loop antenna having the same circumference as the X-axis loop antenna 1 at a position rotated by 90 ° about the diameter, and 3 is a position obtained by rotating the X-axis loop antenna 1 at 90 ° about a diameter parallel to the bottom plate 12. , A power receiving point provided on the X-axis loop antenna, a power receiving point provided on the Y-axis loop antenna 2, and a power receiving point 5 provided on the Z-axis loop antenna 3, respectively. The signal line 6 extending from Each of the signal lines 5 is input and a changeover switch for selecting one of the signals is provided. Reference numeral 7 denotes a fixed portion at an intersection of each of the X-axis loop antenna 1, the Y-axis loop antenna 2, and the Z-axis loop antenna 3, and 8 From the fixing portion 7, the columns 9 fixed vertically to the bottom plate 12 from the fixing portions 7 of the Z-axis loop antenna 3 and the X-axis loop antenna 1 are fixed to the fixing portion 7 and the bottom plate 12, respectively. The test equipment located at the center of the space created by the axis loop antenna 2 and the Z axis loop antenna 3, 10 is the test equipment 9
The test table 11 on which the test table 10 is placed is set upright on the bottom plate 12 to support the test table 10, one of which is fixed to the center of the test table 8 and the other is fixed to the bottom plate 12, and 10 is a bottom plate.

In the apparatus configured as described above, the magnetic fields in the X-axis, Y-axis, and Z-axis directions generated from the EUT 8 correspond to the X-axis loop antenna 1 and the Y-axis loop antenna disposed on the respective axes. 2. The antenna is guided to the Z-axis loop antenna 3, a high-frequency current flows through each loop antenna, and a current is detected at a power receiving point in each antenna, and is input to a measuring instrument via a changeover switch.

[0004]

Since the conventional electromagnetic field measuring apparatus is configured as described above, a loop antenna is required for each of the X, Y, and Z axes, and a high-frequency current flowing through each antenna is required. Is the switch S to measure individually
W is required. Also, depending on each antenna,
There is a problem that a three-dimensional space is required, and it is difficult to store it after the measurement is completed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electromagnetic field measuring apparatus which can reduce the number of loop antennas and changeover switches, and can be divided after the measurement is completed and can be stored in a small space. It is an object.

[0006]

According to a first aspect of the present invention, there is provided an electromagnetic field measuring apparatus which is vertically set on a bottom plate, has vertical frames on both sides, and
Antenna mounting frame with horizontal frame and vertical to bottom plate
At the upper end of the support erected in a plane parallel to the bottom plate
A turntable that is rotatably provided and on which the EUT is mounted;
Loop antenna and the center of this loop antenna
The antenna is mounted orthogonally and has the same loop as the loop antenna.
Holding frame that draws a semicircular arc with the diameter and thickness of the
Provided on each frame of the tena mounting frame,
The holding frame is detachably attached and rotatable
A rotating support, and an X-axis power generated from the EUT.
When measuring the magnetic field strength, install the loop antenna
Fix it on the same surface as the mounting frame, and loop unwind the front of the EUT.
Turn the turntable so that it is parallel to the surface of the tena and measure.
Also measure the Y-axis electromagnetic field strength generated from the EUT.
The front of the EUT perpendicular to the loop antenna.
Turn the turntable so that the measurement
When measuring the electromagnetic field strength of the Z axis generated from
From the rotating support installed on the horizontal frame above the mounting frame
Remove the loop antenna and rotate the rotation support 90 °
To the vertical frame on both sides of the antenna mounting frame.
The installed rotation support is rotated 90 ° together with the loop antenna
After that, the holding frame is installed on a horizontal frame
It is configured to be attached to a tool for measurement.

According to another aspect of the present invention, there is provided an electromagnetic field measuring apparatus comprising:
Two axes that support the tena and the holding frame in a T-shape and are removable
It has a support .

[0008] electromagnetic field measuring apparatus according to claim 3, the rotation support
Has a loop antenna mounting groove and floats in this mounting groove.
A possible bearing is provided.

[0009]

[0010]

[0011]

[0012]

[0013]

According to the electromagnetic field measuring apparatus of the first aspect, the number of loop antennas is reduced to one, the number of switches for switching signals of three axes is reduced, and no space is required for storage.

According to the electromagnetic field measuring apparatus of the present invention, the loop antenna and the holding frame can be supported in a T-shape.

In the electromagnetic field measuring apparatus according to the third aspect, the loop antenna can be slid by the floating ball bearing embedded in the groove.

[0016]

[0017]

[0018]

[0019]

[0020]

【Example】

Embodiment 1 FIG. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIGS. 1 to 6, reference numeral 1 denotes a case in which a circumferential surface passes through the center of the test device 9 and stands upright to the mounting leg 12 in order to measure an electromagnetic field generated from the X and Y axes of the test device 9. A loop antenna 4, a power receiving point provided on the loop antenna 1, a signal line 5 connected from the power receiving point 4 to a measuring instrument,
7a is a biaxial support that supports the loop antenna 1 and the holding frame 13 in a T-shape and is detachable, and 7b is the loop antenna 1
And the antenna mounting frame 8 at the intersection of the antenna mounting frame 8 and the antenna mounting frame 8 on the extension line of the support 11 and the loop antenna mounting / detaching or holding frame 1
Reference numeral 7b-1 denotes an attachable / detachable jig having a groove to be attached to the loop antenna 1;
Is a rotating shaft of a cylinder fixed to the antenna attaching / detaching jig 7b-1, 7b-3 is fixed to the rotating shaft 7b-2, and a stopper provided on the side opposite to the antenna attaching / detaching jig 7b-1; Is a fixing jig which is embedded in the antenna mounting frame 8, has a hole into which the rotating shaft 7b-2 is inserted, and has a groove in which the stopper 7b-3 is fitted in two orthogonal directions. 7b-5 is a rotating shaft. A rotating jig fixed to 7b-2 and an antenna attaching / detaching jig 7b-1 and covering the fixing jig 7b-4, 7b-6 is a rotating shaft 7b-
A ring-shaped spring provided in the gap between the rotating jig 2 and the rotating jig 7b-5, and a sliding member 7c constituted by a floating ball bearing embedded in several places in the groove of the antenna attaching / detaching jig 7b-1. A jig, 8 is an antenna mounting frame surrounding the loop antenna 1, 9 is a test device placed at the center of the circumference of the loop antenna 1, 10 is a turntable on which the test device 9 is placed, and 10a is a rotary table. Upper plate constituting the base 10, 10b
Is a guide plate projecting annularly from the lower surface of the upper plate 10a;
Has a disk-shaped horizontal plate in the upper part into the hole formed by the guide plate 10b and the upper plate 10a, a lower part fixed to the bottom plate 12, a reference numeral 12 a bottom plate to which the antenna mounting frame 8 and the support 11 are fixed, and a reference numeral 13 The holding frame has a semicircular arc having the same loop diameter and thickness as the loop antenna 1 and has both ends attached to the biaxial support 7a.

In the apparatus configured as described above, when measuring the X-axis electromagnetic field intensity generated from the EUT 8, the loop antenna 1 is fixed to the same surface as the antenna mounting frame 8, and the EUT 8 The turntable 10 is rotated so that the front of is parallel to the surface of the loop antenna 1. Then, a high-frequency current flowing through the loop antenna 1 is detected at a power receiving point 4 and input to a measuring instrument through a signal line 5. When measuring the Y-axis electromagnetic field intensity generated from the EUT 8, the turntable 10 is set so that the front of the EUT 8 is perpendicular to the surface of the loop antenna 1.
To rotate. Further, when measuring the intensity of the Z-axis electromagnetic field generated from the EUT 8, the loop antenna 1 is removed from the rotation support 7b installed on the horizontal frame above the antenna mounting frame 8, and the antenna of the rotation support 7b is removed. Removable jig 7b
-1 to lift the stopper 7b-3 out of the groove of the fixture 7b-4, rotate it by 90 °, and then again stop the stopper 7b-3.
Into the groove of the fixture 7b-4. Similarly, the rotation support 7b, which is installed on the vertical frame on both sides of the antenna mounting frame 8 and has the loop antenna 1 mounted thereon, is rotated by 90 ° together with the loop antenna 1. Thereafter, the loop antenna 1 is rotated by the sliding property of the sliding jig 7c of the rotary support 7b, so that the holding frame 13 can be mounted on the rotary support 7b installed on the horizontal frame above the antenna mounting frame 8. And the holding frame 13 is mounted on the rotary support 7b.

[0022]

Effects of the Invention electromagnetic field measuring apparatus according to claim 1, together with Le Puantena is reduced to one, reduces the changeover switch 3 axes of the signal, also it does not take even space during storage.

According to a second aspect of the present invention, there is provided an electromagnetic field measuring apparatus comprising:
Two axes that support the tena and the holding frame in a T-shape and are removable
With the support, the loop antenna and the holding frame can be supported in a T-shape.

The electromagnetic field measuring apparatus according to claim 3, the rotation support
Has a loop antenna mounting groove and floats in this mounting groove.
Since a possible bearing is provided, the loop antenna can be slid by the floatable ball bearing embedded in the groove.

[0025]

[0026]

[0027]

[0028]

[Brief description of the drawings]

FIG. 1 is an X and Y axis measurement layout of an electromagnetic field measuring apparatus according to an embodiment of the present invention.

FIG. 2 shows the Z of the electromagnetic field measuring apparatus according to one embodiment of the present invention.
It is an axis measurement arrangement drawing.

FIG. 3 is a front sectional view showing a rotating support of the electromagnetic field measuring apparatus according to one embodiment of the present invention.

FIG. 4 is a side sectional view showing a rotating support of the electromagnetic field measuring apparatus according to one embodiment of the present invention.

FIG. 5 shows an electromagnetic field measuring device 2 according to an embodiment of the present invention.
It is sectional drawing which shows a shaft support.

FIG. 6 is a sectional view showing a turntable of the electromagnetic field measuring apparatus according to one embodiment of the present invention.

FIG. 7 is a measurement layout diagram of a conventional electromagnetic field measurement device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X-axis loop antenna 2 Y-axis loop antenna 3 Z-axis loop antenna 4 Power receiving point 5 Signal line 6 Changeover switch 7 Fixture 7a 2-axis support 7b Rotation support 7b-1 Antenna attachment / detachment jig 7b-2 Rotation axis 7b- Reference Signs List 3 Stopper 7b-4 Fixing jig 7b-5 Rotating jig 7b-6 Spring 7c Sliding jig 8 Antenna mounting frame 9 EUT 10 Turntable 10a Top plate 10b Guide plate 11 Support column 12 Bottom plate 13 Holding frame

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Mitsuhiko Kanda 2-14-40 Ofuna, Kamakura City Mitsubishi Electric Corporation Lifestyle Systems Research Institute (58) Field surveyed (Int. Cl. ⁷ , DB name) G01R 29 / 08 G01R 33/02

Claims (3)

(57) [Claims] 1. A vertical frame which is set up vertically on a bottom plate and on both sides.
An antenna mounting frame having an upper horizontal frame, and an upper end of a support vertically erected on the bottom plate.
The test equipment is placed rotatably on the
The turntable, one loop antenna, and the center of the loop antenna
The diameter and thickness of the same loop as the loop antenna
A holding frame an arch with, provided in each frame of the antenna mounting frame, said Rupua
When the antenna or holding frame is detachably attached
A rotatable rotating support, and the X-axis electromagnetic field intensity generated from the EUT is
When measuring, attach the loop antenna to the antenna
Frame, and fix the front of the EUT
Rotate the turntable so that it is parallel to the plane of the antenna.
And the Y-axis electromagnetic field generated by the EUT
When measuring the strength, place the front of the EUT
Rotate the turntable so that it is perpendicular to the plane of the antenna.
The Z-axis electromagnetic wave generated from the EUT
When measuring the field strength, the upper part of the antenna mounting frame
The loop support is mounted on the rotating support provided on a horizontal frame.
Remove the antenna and rotate the rotation support 90 °
Both are installed on the vertical frame on both sides of the antenna mounting frame
90 ° together with the loop antenna,
After rotating, the holding frame was set on the upper horizontal frame
It is characterized in that it is configured to be mounted on the rotating support and measured.
Electromagnetic field measuring device. 2. The loop antenna and the holding frame are connected to each other by T
Equipped with a biaxial support that can be supported in a U-shape and is detachable
The electromagnetic field measuring apparatus according to claim 1, wherein: 3. The loop support is mounted on a loop antenna.
It has a groove, and a bearing that can float up and down is provided in this mounting groove.
The electromagnetic field measuring apparatus according to claim 1, wherein: