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:|
|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|
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.
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
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 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|
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.
This completes the Good Health Saunas AC ELF EMF/EMC Magnetic and Electric Product Emission Test.
Vitatech EMF Technician
Glossary of Abbreviations
|ELF||Extremely Low Frequency|
|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|
|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
|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]|