An Experimental Study on Prevention of Electromagnetic Fields Using the New Bi-Digtal O-Ring Test Hauling Machine(MK-III)

Abstract

Purpose:

To Establish an electromagnetic prevention method using the new Bi-Digital CiRing Test (BDORT) hauling machine(MK-III) and to devise a portable system for easy transportation.

Subjects:

MK-III, Personal Computer (P.C.) and portable system connected to an electromagnetic wave emission prevention device.

Method:

The examiner technique was substituted with the MK-III and the examiner finger power O-Ring Test was standardized to improve diagnostic accuracy. The main unit can be powered by both AC and DC sources. A portable system was designed with priority given to convenience and safety.

Results:

The BDORT method was applied using the new hauling machine and electromagnetic fields in the test environment and from the MK-III were measured to clarity the shielding effects of the electromagnetic (E.M) Shield (Zone).

1. Personal computer system (DB451-DC8) 100VAC - 19V M, distance 30cm(ELF V/m)

   

   N=10	a) Test environment	b) PC	c) with Zone
   X	3.12	78.56	2.68
   +/-	+/-	+/-	+/-
   2sd	0.66	0.30	1.92
   Up/Down%	(a-b) 96.03% ↑↑↑		(b-c) 96.59% ↓↓↓

2. Drive system (DCservomotorDME44B8HPB) AC100V-24V M, distance 30cm(ELF V/m)

   

   N=10	a) Test environment	b) Rectifiermotor	c)with Zone
   X	2.94	14.55	2.92
   +/-	+/-	+/-	+/-
   2sd	1.02	0.42	0.76
   Up/Down%	(a-b) 76.79% ↑↑	(b-c) 79.93% ↓↓

3. PC with DC battery (Internal charge type) DC 24V M, distance 30cm(ELF V/m)

   

   N=10	a) Test environment	b)PC with out Zone
   X	3.18	2.75
   +/-	+/-	+/-
   2sd	0.90	0.54
   Up/Down%	(a-b) 13.52%

4. Drive with DC battery(DCservomotorDME44B8HPB) DC24VM,distance 30cm(ELF V/m)

   

   N=10	a) Test environment	b)DC servomotor with out Zone
   X	2.64	2.96
   +/-	+/-	+/-
   2sd	1.34	1.16
   Up/Down%	(a-b) 10.80% ↓

Discussion:

Electromagnetic field (ELF) was measured at a distance of 30cm from each subject. ThelOOV AC personal Computer system with the built- in - MK - in generated an ELF Strength of 3.12+/-0.66 V/m in the test environment and that from the personal computer was 78.56+/-0.30V/m.

When Zone was connected the value decreased by as much as 96.6% to 2.68+/-1.92 V/m. The drive system produced an ELF strength of 2.94+/-1.02 V/m in the test environment and that produced from the motor with a 24VDC rectifier was 14.55+/-0.42V/m. When Zone was connected, these values decreased by 79.93% to 2.92+/-0.76V/m. The ELF Strength of the personal computer with a 24V battery was 3.18 0.90V/m in the test environment but decreased by 13.52% to 2.75+/-0.54V/m when Zone was not connected. The ELF Strength of the drive with a 24V DC battery was 2.64+/-1.34 V/m in the test environment but increased by 10.8%+/- 1.16V/m when Zone was not connected to the motor.