AC ELF EMF/EMC Magnetic and Electric Product Emission Test

Good Health Saunas (GHS)
2140 West Wisconsin Ave.
Appleton, Wisconsin 54914

Document Number: 2224

Version/Revision: Date: Prepared by: Checked by: Approved by: Reason for Issue:
1.0 18-Jan-18 CV SC CV First Issue
Vitatech Electromagnetics Review and Acceptance Status
This decal is to be used for submitted documents requiring acceptance by Vitatech Electromagnetics.
Code 1. All electromagnetic interference are within acceptable levels
Code 2. AC 60 Hz magnetic flux density levels are within acceptable levels
Code 3. Static and Quasi-static DC levels are within acceptable levels
Code 4. Radio Frequency Power flux density levels and/or electric field strengths are within acceptable levels
Review/Accepted by:
(signature)
Contents

Executive Summary3

Background3

Executive Summary3-6

Executive Summary6-8

Executive Summary

The results of the electromagnetic compatibility testing indicate that both heaters tested emitted very low electromagnetic fields (EMF) and meet all known federal, state, and industry standards,including Vitatech recommendeds 10 mG RMS or less for long term human exposure 1 to electromagnetic fields (EMF). Both 300 watt 120-volt heaters range between 0.139 mG to 0.206 mG RMS at the power source and between 0.083 mG and 0.088 mG RMS at the panel center. Additionally, the peak electric field strength levels recorded at both panels are within ICNIRP recommended 4,167 V/m human health exposure limit for the general public and fully complies with Vitatech’s recommended exposure threshold.

Background

Vitatech Electromagnetics, LLC was commissioned by Good Health Saunas to perform comprehensive AC ELF EMF/EMC (electromagnetic compatibility) testing for two 300 watts 120 V panel heaters. For this test, two comparable models, ending in model numbers 226 and 175 were tested under normal ON and OFF settings within a AC ELF magnetic shielded enclosure where ambient levels are controlled to below 0.02mG peak-to-peak. Vitatech measured the AC ELF
magnetic fields from 30 Hz to 3000 Hz, and electric field strength from 5 Hz to 500 kHz presented in isotropic V/m (volt-per-meter) units. The survey was performed on January11th, 2018, by a Vitatech EMF Technician.

Electromagnetic induction occurs when time-varying AC magnetic fields couple with any conductive object including wires, electronic equipment and people, thereby inducing circulating currents and voltages. In unshielded (susceptible) electronic equipment (computer monitors, video projectors, computers, televisions, LANs, diagnostic instruments, magnetic media, etc.) and signal cables (audio, video, telephone, data), electromagnetic induction generates electromagnetic interference (EMI), which is manifested as visible screen jitter in displays, hum in analog telephone/audio equipment, lost sync in video equipment and data errors in magnetic media or digital signal cables.

Magnetic flux density susceptibility can be specified in one of three terms: B rms, B peak-to-peak (p-p) and B peak (p) according to Equation 1 below:


AC ELF Magnetic Flux Density Product Emissions Testing

Vitatech recorded timed AC ELF magnetic flux density levels at a separation distance of two (2”) inches from the Good Health Saunas 300 watt 120-volt panel heater for 10 minutes, at 16” and 25” from the floor and/or base. Vitatech recorded the AC ELF (30 to 3000 Hz) magnetic fields in peakto-peak units as shown in Figures #1 and #2, then converted (see Equation #1) into Br resultant RMS units which is normally used when evaluating the potential impact on long-term human
health, see EXHIBIT A.

Serial No. Peak Magnetic Field Level At 16” from floor Peak Magnetic Field Level At 25” from floor Baseline Peak Ambient Magnetic
RF170315-226 0.249 mG peak-to-peak
0.088 mG RMS
0.585 mG peak-to-peak
0.206 mG RMS
0.2 mG peak-to-peak
0.070 mG RMS
RF170315-175 0.237 mG peak-to-peak
0.083 mG RMS
0.395 mG peak-to-peak
0.139 mG RMS
0.2 mG peak-to-peak
0.070 mG RMS

Table #1, AC ELF Peak Magnetic Field Levels at 16” and 25” Panel Height

Figure #1, Panel RF170315-226 Magnetic Field Testing, presents the magnetic flux density levels recorded at the panel heater powered ON and OFF at 16” and 25” from the floor and within 2” from panel heater. As shown in Figure #1, a peak of 0.206 mG RMS was recorded at 25” from floor (nearby power supply). At 16” from floor and almost center of panel, a peak of 0.088 mG RMS was recorded. A baseline measurement of 0.070 mG RMS (0.2 mG p-p) was recorded within the shielded enclosure where panel was tested.

Figure #2, Panel RF170315-175 Magnetic Field Testing, presents the magnetic flux density levels recorded at the panel heater powered ON and OFF at 16” and 25” from the floor and within 2” from panel heater. As shown in Figure #2, a peak of 0.139 mG RMS was recorded at 25” from floor (nearby power supply). At 16” from floor and almost center of panel, a peak of 0.083 mG RMS was recorded. A baseline measurement of 0.070mG RMS (0.2 mG p-p) was recorded within the shielded enclosure where panel was tested.

AC ELF Shielded Enclosure
Probe at 16” from floor, 2” from panel
Probe at 25” from floor, 2” from panel
AC ELF Electric Field Strength Site Assessments

Vitatech recorded timed AC ELF electric field strength with the EHP-50D isotropic three-axis electric field meter at a separation distance of two (>2”) inches from the Good Health Saunas 300 watt 120-volt panel heater for a duration of two (2) minutes. All electric field strength levels are presented in isotropic V/m (volt-per-meter) units which is similar to the Br resultant for magnetic fields. The following table presents the isotropic peaks while heater panel is operational:

Serial No Electric Field Strength Powered ON (Isotropic) Average Field Strength Powered ON (Isotropic)
RF170315-226 177.08 V/m 174.48 V/m
RF170315-175 181.96 V/m 181.03 V/m

Table #2, Peak and Average Electric Field Levels at 2” from Panel

Figure 3, Panel RF170315-226 Electric Field Testing, presents the electric field levels recorded with the EHP-50D isotropic three-axis electric field meter at a separation distance of ~2 inches from the 300 watts 120-volt heater panel during operational (ON) mode. As seen in Figure #3, a peak electric field strength of 177.08 V/m was recorded while powered ON.

Figure 4, Panel RF170315-175 Electric Field Testing, presents the electric field levels recorded with the EHP-50D isotropic three-axis electric field meter at a separation distance of ~2 inches from the 300 watts 120-volt heater panel during operational (ON) mode. As seen in Figure #4, a peak electric
field strength of 181.96 V/m was recorded while powered ON.

Probe 2” from panel

This completes the Good Health Saunas AC ELF EMF/EMC Magnetic and Electric Product Emission Test.

Best Regards,
Vitatech EMF Technician

Glossary of Abbreviations
Abbreviation Explanation/Definition
AC Alternating Current
DC Direct Current
ELF Extremely Low Frequency
EMF Electromagnetic Field
EMI Electromagnetic Interference
EMP Electromagnetic pulse
Hz Hertz
kHz Kilohertz
MHz Megahertz
mG Milligauss, equivalent to 1.0 x 10-7 tesla
N.E.C. National Electric Code
N.E.S.C National Electric Safety Code
p-p Peak to peak
PPE Personal Protective Equipment
PVC Polyvinyl chloride
RF Radio Frequency
RFI Radio Frequency Interference
RFSP Radio Frequency Safety Program
RGS Rigid galvanized steel
RMS Root Mean Square
ROW Right of way
SELF Sub-extremely low frequency
Glossary of Terms
Terminology Explanation/Definition
Access Controls A practice of restricting access to areas wherein RF exposure may exceed applicable exposure limits via physical means such as indicative or positive access control barriers or by the installation of appropriate signage. RF safety signage, when used in controlled environments and combined with appropriate RF safety training or information can be a sufficient means of access control
Administrative Controls Procedures and information provided to personnel for the purpose of reducing exposure to potential RF hazards and that generally depend on the awareness and participation of personnel for their effectiveness. Examples include warning signs and alarms, indicative barriers, standard operating procedures, personal protective equipment (PPE), time limits on the duration of exposure, and RF safety training
Magnetic field A vector field produced by a magnetic object, electric current or varying electric field and is detected by the force it exerts on other magnetic materials and moving electric charges.
Magnetic flux density A vector field quantity, B, which results in a force that acts on a moving charge or charges, and is expressed in tesla (T)
Digitizer A device used to convert an analog signal to a digital signal
Controlled Environment An area where the occupancy and activity of those within is subject to control and accountability as established by an RFSP for the purpose of protections from RF exposure hazards. See also: general public exposure and occupational exposure Contrast: Uncontrolled Environment
General Public Exposure RF exposure of persons who have not received any form of RF safety awareness information or training. Typically, general public exposure occurs in uncontrolled environments and includes individuals of all ages and varying health status, including children, pregnant women, individuals with impaired thermoregulatory systems, individuals equipped with electronic medical devices, and persons using medications that may result in poor thermoregulatory system performance.
Hazard An intrinsic property or condition of a device, or location, that has the potential to cause harm to people of damage to property
Indicative barrier Barriers, such as chains, rails, and demarcated areas that require awareness and participation of personnel as a form of administrative control
Maximum Permissible Exposure (MPE) Derived limits in RF exposure standards for time averaged and peek exposures to ambient electric (E) and magnetic (H) fields;
Normally Accessible Area For RF protection purposes an area that can be accessed without recourse to special actions, special equipment, or personal protective equipment without which assess in not feasible
Occupational Exposure RF exposure of persons resulting as a consequence of their employment who have been made fully aware of the potential for exposure and can exercise control over their exposure such as through the use of administrative or engineering controls or safe work practices
Personal Protective Equipment Equipment designed to protect personnel from serious workplace injuries or illnesses resulting from exposure to RF energy, contact with chemical, radiological, and physical agents, and electrical, mechanical and other workplace hazards. For purposes of RF safety, PPE includes electrically insulating gloves and RF- attenuating clothing in the form of coveralls, gloves, socks, and shielding hood assemblies.
Positive Access Control Barriers Locked doors and ladder cages, positive access control fences, etc. that are a form of engineering controls and that provide a positive restriction on access.
Radio Frequency A frequency or band of frequencies suitable for telecommunications.[For this report refers directly to 75 MHz to 3,000 MHz]
Radio Frequency Hazard Area For purposes of this report an area in which RF fields or contact induced currents or contact voltage may exceed the exposure limit or reference levels of an RF exposure regulation, standard or guideline [FCC Bulletin OET 65]