RF Exposure Info

FCC ID: RHK-WS1

RF Exposure Info

Download: PDF
FCCID_4445647

EKCms




                                                                                                                   I N C
                                     RADIO FREQUENCY                                                        J
                                                                                                            9
                                     EXPOSURE REPORT                                                        zl
                                                                                                           in
                                                                                                            ol      U
                                                                                                           M
                                                   FOR THE                                                          U
                                                                                                            i
                                        Device: Weather Node
                                             Model: W1.0
                                                                                                           c
                                                                                                           n        &
                                                                                                                    0




                                                                                                         Testing
                                                                                                                    |=
                                            Report No.: 102618—5
                                                                                                                    €
                                                                                                                    &
                                        Date of issue: September 6, 2019                                            0
PREPARED FOR:                                           PREPARED BY:
                                                                                                                    &
Digital Path Inc.                                       Benny Lovan
                                                                                                                    C
                                                                                                                    A
1065 Marauder St.                                       CKC Laboratories, Inc.
Chico, CA 95973                                         5046 Sierra Pines Drive
                                                        Mariposa, CA 95338


The test data contained in this report documents the observed testing parameters pertaining to and are
relevant for only the sample equipment tested in the agreed upon operational mode(s) and
configuration(s) as identified herein. Compliance assessment remains the client‘s responsibility. This
report may not be used to claim product endorsement by A2LA or any government agencies. This test
report has been authorized for release under quality control from CKC Laboratories, Inc.




                                                  Steve Behm
                              Director of Quality Assurance & Engineering Services
                                             CKC Laboratories, Inc.


Purpose:

To demonstrate compliance with United States, Canada, Australia and/or European Union RF Exposure
requirements for Portable equipment (devices used ≤20cm from the body) with power output below
exemption levels or Mobile equipment (devices used >20cm from the body) where Maximum
Permissible Exposure (MPE) Calculations apply.


Device and Antenna Operating Configuration:
 Device operating at maximum output power with continuous transmission of modulated data.

 The present report is assessing compliance for the band of 902 – 928MHz. Operation in the band of
 902-928MHz refers to report 102618-7.

 There are multiple antennas that may be used; the gain of these antennas are 2.5dBi, 6dBi and 11dBi.
 Depending on which antenna is used, the power will be adjusted accordingly as noted in the
 referenced test report.

Test Procedure:
 This equipment is evaluated in accordance with the guidelines set forth in KDB 447498 & ANSI C95.1
 for the US, Health Canada Safety Code 6 & RSS 102 for Canada, ARPANSA RPS3 for AU and EN 62479 or
 EN 62311 for EU.

Other Considerations:
 Report considers stand-alone configurations only. RF Exposure limits are calculated at the mid-point of
 the operating band. The EUT does not support simultaneous transmission and therefore the RF
 Exposure Power Density Assessment for Multi Transmitter, Simultaneous Transmission is not applicable.

Referenced Test Reports:
 The following test report was referenced in conjunction with this assessment:
 102618-7 FCC Subpart C Part 15.247, 902-928MHz




                                                                                            Page 2 of 10
                                                                                    Report No: 102618-5


                             RF Exposure Power Density Assessment
                                     (Single Transmitter, Stand Alone)

MPE Calculation:
                                           𝐸𝐼𝑅𝑃
                 π‘ƒπ‘œπ‘€π‘’π‘Ÿ 𝐷𝑒𝑛𝑠𝑖𝑑𝑦 (𝑆) =       4πœ‹ 𝑑 2
                                                    Given: EIRP in mW or W and d in cm or m

US MPE Assessment
Power Reported is:    β˜’ Peak ☐ Average
Limit Used is:        β˜’ General Population ☐ Occupational Exposure
  Operating Band        Power       Ant Type/Gain        EIRP      Distance      MPE          Limit    Comments
        MHz              dBm              dBi            dBm          cm       mW/cm2 mW/cm2
                                     Omni / 2.5dBi
   902.5-927.5MHz       15.48                            17.98        20        0.0125          1
                                        Radio 1
                                     Omni / 2.5dBi
   902.5-927.5MHz       16.72                            19.22        20        0.0166          1
                                        Radio 2
                                      Omni / 6dBi
   902.5-927.5MHz       15.48                            21.48        20        0.0280          1
                                        Radio 1
                                      Omni / 6dBi
   902.5-927.5MHz       16.72                            22.72        20        0.0372          1
                                        Radio 2
                                    Sector / 11dBi
   902.5-927.5MHz       15.48                            26.48        20        0.0885          1
                                        Radio 1
                                    Sector / 11dBi
   902.5-927.5MHz       16.72                            27.72        20        0.1177          1
                                        Radio 2
Note: Radio 1 and Radio 2 are identical. At the output, Radio 1 uses a Passive Band Pass Filter and Radio 2 has no
filter.




                                                                                                      Page 3 of 10
                                                                                              Report No: 102618-5


Summary:

Exemptions:
Equipment demonstrating compliance by portable RF exposure exemption have been evaluated,
without further testing, for use under either portable or mobile RF exposure configurations. Additional
configurations including collocation or simultaneous transmission with other transmitters (including
necessary separation distances) are subject to further assessment. Certain exemption criteria may
define specific separation distances. It is assumed that the manufacturer shall design the equipment
such that these minimum separation distance is met.

MPE Calculation Results:
Equipment demonstrating compliance with MPE calculations have been evaluated, without further
testing, for use under mobile RF exposure configurations as identified herein. Additional configurations
including collocation or simultaneous transmission with other transmitters (including necessary
separation distances) are subject to further assessment. It is assumed that the manufacturer shall
design the equipment such that the minimum separation distance of 20cm (or greater, as listed above)
is met or that the manufacturer provides a protection guide (e.g. installation instructions) to the end
user such that the antenna(s) may be installed in accordance with the manufacturer’s instructions in
such a manor to maintain the minimum separation distance.


General Comments:
The absorption and distribution of Electromagnetic energy in the body is a very complex phenomena
that depends on the mass, shape and physiological condition of the body; the orientation of the body
with respect to the fields; and, the electrical properties of the body and the environment. Variables that
may play a substantial role in possible biological effects are those that characterize the environment
(including but not limited to: ambient temperature, air velocity, relative humidity and body insulation);
and those that characterize the individual (including but not limited to: age, gender, activity level and
existing debilitation or disease). Because innumerable factors may interact to determine specific
biological effects of exposure to electromagnetic fields, any protection guide should consider both
intended and unintended operational environments and provide guidance for installation and use of the
product such that proper separation distances can be maintained. (ANSI C95.1)




                                                                                              Page 4 of 10
                                                                                      Report No: 102618-5


                                   APPENDIX A - RF Exposure Limits

United States Compliance Requirements (1.1310):

                                         RF Exposure Evaluation Limits
                                      Occupational / Controlled Exposure
Frequency Range            Electric Field       Magnetic Field       Power Density            Averaging Time
(MHz)                     Strength (V/m)        Strength (A/m)         (mW/cm2)                 (minutes)
0.3-3.0                         614                     1.63                 *(100)                   6
3.0-30                       1842 / fMHz             4.89 / fMHz          *(900 / fMHz 2)             6
30-300                          61.4                   0.163                     1                    6
300-1500                         ---                     ---                fMHz / 300                6
1500-100,000                     ---                     ---                   5.0                    6

                                         RF Exposure Evaluation Limits
                                General Population / Uncontrolled Exposure
Frequency Range            Electric Field       Magnetic Field       Power Density            Averaging Time
(MHz)                     Strength (V/m)        Strength (A/m)         (mW/cm2)                 (minutes)
0.3-1.34                       614                      1.63                 *(100)                  30
1.34-30                      824 / fMHz              2.19 / fMHz          *(180 / fMHz 2)            30
30-300                         27.5                    0.073                   0.2                   30
300-1500                        ---                      ---               fMHz / 1500               30
1500-100,000                    ---                      ---                   1.0                   30
* Plane wave equivalent power density
Limit is calculated based on the mid-band frequency used in the operating frequency range.

Exemption Limits for Stand-Alone SAR Evaluation:
In accordance with KDB 447498 D01

                                   Max Output Power at Exemption Limit (mW)
  Frequency
                                    d ≤ 50mm                                     50mm < d ≤ 20cm
    (MHz)
                       1 𝑅 βˆ™ 50                100                  𝑅 βˆ™ 50             100                100
     <100               βˆ™(      ) βˆ™ (1 + 𝐿𝑂𝐺 (     ))              (       + (𝑑 − 50)      ) βˆ™ (1 + 𝐿𝑂𝐺 (     ))
                       2 √0.1                 𝑓𝑀𝐻𝑧                   √0.1              150               𝑓𝑀𝐻𝑧
                                                                              𝑅 βˆ™ 50              𝑓𝑀𝐻𝑧
   100-1500                                                                 (         + (𝑑 − 50)       )
                                        π‘…βˆ™π‘‘                                   √𝑓𝐺𝐻𝑧               150
                                    (           )
                                        √𝑓𝐺𝐻𝑧                                  𝑅 βˆ™ 50
  1500-6000                                                                  (        + (𝑑 − 50) βˆ™ 10)
                                                                               √𝑓𝐺𝐻𝑧
R is the allowed ratio: 3 for 1-g SAR and 7.5 for 10-g extremity SAR.
d is distance in mm, rounded to the nearest mm.




                                                                                                     Page 5 of 10
                                                                                             Report No: 102618-5


Canadian Compliance Requirements (RSS-102):

                                  RF Exposure Evaluation Limits
                               Occupational / Controlled Exposure:
Frequency Range     Electric Field       Magnetic Field        Power Density         Averaging Time
(MHz)              Strength (V/m)        Strength (A/m)           (W/m2)               (minutes)
0.003-10                170                    180                   --               Instantaneous
0.1-10                   --                 1.6 / fMHz               --                     6
1.29-10             193 / fMHz 0.5              --                   --                     6
10-20                   61.4                  0.163                 10                      6
20-48                129.8 / f 0.5       0.3444 / fMHz 0.25    44.72 / fMHz 0.5             6
48-100                 49.33                 0.1309                6.455                    6
100-6000            15.60 fMHz 0.25      0.04138 fMHz 0.25     0.6455 fMHz 0.5              6
6000-15000              137                   0.364                 50                      6
15000-150,000           137                   0.364                 50               616000 / fMHz 1.2
150,000-300,000     0.354 fMHz0.5        9.40x10-4 fMHz 0.5    3.33x10-4 fMHz        616000 / fMHz 1.2

                                  RF Exposure Evaluation Limits
                         General Population / Uncontrolled Exposure
Frequency Range     Electric Field       Magnetic Field       Power Density          Averaging Time
(MHz)              Strength (V/m)        Strength (A/m)          (W/m2)                (minutes)
0.003-10                 83                    90                     --              Instantaneous
0.1-10                    --                0.73 / f                  --                    6
1.1-10               87 / fMHz 0.5             --                     --                    6
10-20                  27.46                0.0728                    2                     6
20-48              58.07 / fMHz 0.25    0.1540 / fMHz 0.25      8.944 / fMHz 0.5            6
48-300                 22.06                0.05852                 1.291                   6
300-6000           3.142 fMHz 0.3417   0.008335 fMHz 0.3417   0.02619 fMHz 0.6834           6
6000-15000              61.4                 0.163                   10                     6
15000-150,000           61.4                 0.163                   10              616000 / fMHz 1.2
150,000-300,000     0.158 fMHz 0.5      4.21x10-4 fMHz 0.5      6.67x10-5 fMHz       616000 / fMHz 1.2




                                                                                            Page 6 of 10
                                                                                    Report No: 102618-5


Exemption Limits for Stand-Alone SAR Evaluation:

                       Exemption Limits (mW) at Separation Distance (mm)
Freq(MHz)        ≤5   10      15        20      25       30       35       40        45        ≥50
   ≤300          71   101    132       162     193      223      254       284       315       345
    450          52   70      88       106     123      141      159       177       195       213
    835          17   30      42        55      67       80       92       105       117       130
   1900           7   10      18        34      60       99      153       225       316       431
   2450           4    7      15        30      52       83      123       173       235       309
   3500           2    6      16        32      55       86      124       170       225       290
   5800           1    6      15        27      41       56       71       85        97        106


Exemption Limits for Stand-Alone Mobile Routine Evaluation:

Frequency (MHz)          RF Exposure Exemption Limit (mW)
<20                      1000
20-48                    4490 / fMHz 0.5
48-300                   600
300-6000                 13.1 fMHz 0.6834
≥6000                    5000

General1 Comparison of FCC and IC Exemption Limits for Stand Alone SAR Evaluation




1
    Non-Exhaustive
                                                                                         Page 7 of 10
                                                                                 Report No: 102618-5


Australian Radiation Protection and Nuclear Safety Agency Requirements (ARPANSA):

                                     RF Exposure Evaluation Limits
                                  Occupational / Controlled Exposure:
Frequency Range        Electric Field       Magnetic Field       Power Density    Averaging Time
(MHz)                 Strength (V/m)        Strength (A/m)          (W/m2)          (minutes)
0.1 – 1.0                  614               1.63 / fMHz             ---                  6
1.0-10                   614 / fMHz          1.63 / fMHz         1000 / fMHz 2            6
10-400                     61.4                0.163                 10                   6
400-2000               3.07 * fMHz 0.5    0.00814 * fMHz 0.5      fMHz / 40               6
2000-10,000                137                  0.36                 50                   6
10,000 – 300,000           137                  0.36                 50           9.6x10 / fMHz 1.05
                                                                                        4



                                     RF Exposure Evaluation Limits
                            General Population / Uncontrolled Exposure
Frequency Range        Electric Field       Magnetic Field       Power Density    Averaging Time
(MHz)                 Strength (V/m)        Strength (A/m)          (W/m2)          (minutes)
0.10-0.15                    86.8              4.86                   ---                 6
0.150-1.0                    86.8           0.729 / fMHz               --                 6
1.0-10                  86.8 / fMHz 0.5     0.729 / fMHz              ---                 6
10-400                       27.4             0.0729                   2                  6
400-2000                 1.37 fMHz 0.5    0.00364* fMHz 0.5       fMHz / 200              6
2000-10,000                  61.4              0.163                  10                  6
10,000 – 300,000             61.4              0.163                  10          9.6x10 / fMHz 1.05
                                                                                        4

*Power density limit applicable >100MHz


Exemption Limits for Stand-Alone Evaluation:

Occupational Exposure: 100mW
Portable - General Public: 20mW
Mobile – General Public: Separation distance >20cm and power < 20mW or according to IEC 62479.
Or according to ARPANSA RPS3 Table S1




                                                                                         Page 8 of 10
                                                                                 Report No: 102618-5


European Union Compliance Requirements (ICNIRP):

                                         RF Exposure Evaluation Limits
                                      Occupational / Controlled Exposure:
Frequency Range            Electric Field       Magnetic Field       Power Density    Averaging Time
(MHz)                     Strength (V/m)        Strength (A/m)          (W/m2)          (minutes)
0.00082-0.065                   610                24.4                  ---                  6
0.065-1.0                       610                1.6/f                 ---                  6
1.0-10                       610 / fMHz            1.6/f                 ---                  6
10-400                           61                0.16                  10                   6
400-2000                    3.0 * fMHz 0.5     0.008 * fMHz 0.5       fMHz / 40               6
2000-300,000                    137                0.36                  50                   6

                                         RF Exposure Evaluation Limits
                                General Population / Uncontrolled Exposure
Frequency Range            Electric Field       Magnetic Field       Power Density    Averaging Time
(MHz)                     Strength (V/m)        Strength (A/m)          (W/m2)          (minutes)
0.003-0.150                   87                     5.0                  ---                 6
0.150-1.0                     87                 0.73 / fMHz               --                 6
1.0-10                    87 / fMHz 0.5          0.73 / fMHz              ---                 6
10-400                        28                   0.073                   2                  6
400-2000                1.375 fMHz 0.5         0.0037* fMHz 0.5       fMHz / 200              6
2000-300,000                  61                    0.16                  10                  6
*Power density limit applicable >100MHz


Exemption Limits2 for Stand-Alone SAR Evaluation:

Head / Body: 20mW
Extremity: 40mW




2
    EN 62479 Annex A, General Public
                                                                                             Page 9 of 10
                                                                                     Report No: 102618-5


                                         Appendix B - References
1.    ACMA Radiocommunications (Electromagnetic Radio – Human Exposure) Standard, 2014.
2.    AS/NZS 2772.2, Radiofrequency fields – Principles and method of measurement and computation – 3 kHz to
      300 GHz, 2011.
3.    Australian Radiation Protection and Nuclear Safety Agency, ARPANSA RPS 3, Maximum Exposure Levels to
      Radiofrequency Fields 3 kHz to 300 GHz, 2016.
4.    New Zealand Standard, NZS 2772.1, Radiofrequency Fields Part 1: Maximum Exposure Levels 3 kHz to 300
      GHz, 2009.
5.    Federal Communications Commission Knowledge Database (KDB) Publication 447498, “What are the RF
      exposure requirements and procedures for mobile and portable devices?” As in effect on the issue date of this
      report.
6.    Title 47 Code of Federal Regulations, Part 1.1310, “Radiofrequency radiation exposure limits.” As in effect on
      the issue date of this report.
7.    Title 47 Code of Federal Regulations, Part 2.1091, “Radiofrequency radiation exposure evaluation: mobile
      devices.” As in effect on the issue date of this report.
8.    ANSI C95.1 (2005) IEEE Standard for Safety Level with Respect to Human Exposure to Radio Frequency
      Electromagnetic Fields, 3kHz to 300 GHz, 2005.
9.    Health Canada Safety Code 6 Limits of Human Exposure to Radiofrequency Electromagnetic Energy in the
      Frequency Range from 3 kHz to 300 GHz, 2015.
10.   Industry Canada GL-01 Guidelines for the Measurement of Radio Frequency Fields at Frequencies From 3 kHz
      to 300 GH, Issue 3, March 2015.
11.   Industry Canada RSS-102 Radio Frequency (RF) Exposure Compliance of Radiocommunication Apparatus (All
      Frequency Bands) Issue 5, March 2015.
12.   EC Council Recommendation 1999/519/EC “On the limitation of exposure of the general public to
      electromagnetic fields (0Hz to 300GHz),” (1999).
13.   European Committee for Electrotechnical Standardization. European Normative, EN 62311 Assessment of
      electronic and electrical equipment related to human exposure restrictions for electromagnetic fields (0 Hz to
      300 GHz), 2008.
14.   European Committee for Electrotechnical Standardization. European Normative, EN 62479 Assessment of the
      compliance of low power electronic and electrical equipment with the basic restrictions related to human
      exposure to electromagnetic fields (10 MHz to 300 GHz), 2010.
15.   International Commission on Non-Ionizing Radiation Protection. Guidelines for Limiting Exposure to Time-
      Varying Electric, Magnetic, and Electromagnetic Fields (up to 300 GHz). Health Physics 74 (4): 494-522; 1998.
16.   International Commission on Non-Ionizing Radiation Protection Statement on the "Guidelines for limiting
      exposure to time-varying electric, magnetic and electromagnetic fields (up to 300 GHz). Health Physics
      97(3):257-259, 2009.




                                                                                                      Page 10 of 10
                                                                                               Report No: 102618-5



Document Created: 2019-09-17 18:13:01
Document Modified: 2019-09-17 18:13:01

Β© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC