IH Apron Electromagnetic Shielding Test

IH Apron Electromagnetic Shielding Test

Test Method

Test Conditions

Basis for Test Data

Test Method

Test Conditions

①	Product Used	IH Safety Apron, various types
②	Test Conditions	Distance from front of IH unit to body surface: 0–30 cm Height from countertop surface: -10–30 cm Device output: 1350W; Test location: anechoic chamber
③	Measuring Instruments	1) ELT-400 Magnetic Field Exposure Level Tester by NardaSTS (Germany) 2) TDS3014B Digital Oscilloscope by Tektronix Japan

Basis for Test Data

The ICNIRP (International Commission on Non-Ionizing Radiation Protection) has issued guidelines for human protection. The EU adopted EN50366 in 2004 as a standard method for measuring EMF in home appliances. Our tests are based on these standards and adapted using human dummies. Reference: ICNIRP Guidelines (Japanese site)

About ICNIRP…

ICNIRP is a specialist organization that separated from IRPA (International Radiation Protection Association) in 1992 and is a WHO-affiliated body. It investigates various types of non-ionizing radiation and develops international safety guidelines.

Electromagnetic shielding performance against low-frequency magnetic fields was evaluated based on ICNIRP guideline percentages.

The ELT-400 device by NardaSTS used in our tests is the world’s first instrument to implement time-domain ICNIRP evaluation. Using various IH aprons, we measured magnetic flux density (μT) from 10 Hz to 400 kHz and evaluated the data relative to the ICNIRP public exposure guidelines as 100%.

While EN50366 specifies a 30 cm measuring distance from the side of the IH cooker and uses RMS values, we also measured at 10 cm (more representative of actual cooking distance) and evaluated peak values as defined by ICNIRP.

As a result, even without the apron, measurements stayed within guideline limits when standing more than 20 cm from the IH unit. However, closer distances exceeded the guidelines. With our apron, exposure remained within safe limits even at 10 cm. (Yellow areas in the chart below indicate guideline exceedance.)

* The ICNIRP % values shown are calculated from magnetic flux densities using the ICNIRP method.

Regarding Low-Frequency Electromagnetic Wave Shielding Results

The data indicate that the abdomen experiences the highest induced currents from magnetic fields. The IH Safety Apron is designed to shield this region.

IARC (International Agency for Research on Cancer) has classified extremely low-frequency magnetic fields as Group 2B (possibly carcinogenic to humans).

Even with the apron, close contact with the IH unit can exceed the ICNIRP guideline, so it is recommended to stay at least 10 cm away.

Other commercial shielding products were tested and found to offer no protection against low-frequency magnetic fields. The IH Safety Apron is the world’s first commercial product proven to provide shielding against IH cooker EMF.

* Although some OA aprons claim low-frequency electric field protection, WHO states that such low-output fields from office devices are not harmful. Products like OA aprons, stickers, or chips without valid electromagnetic shielding performance based on ICNIRP guidelines cannot be considered protective.

Presentation Data from Medical Aid Co., Ltd. at Medical Conferences

We presented our findings at the 20th Annual Scientific Meeting of the Japanese Society of Cardiac Pacing and Electrophysiology on May 31, 2005, among other conferences and symposia, and received recognition in the fields of science and medicine. Reference: Conference Presentations