HUSH TPM-NK01 RF Exposure Info RF Exposure AutoDiagnostic Engineering S.L.

AutoDiagnostic Engineering S.L. TPM-NK01

FCC ID Filing: 2AFXK-HUSH
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D.F.B. Global Certification S.r.l.
Via Fiume, 35 24030 Paladina (BG) - Italy
Tel. +39 035 078 79 85 Fax +39 035 066 13 84
E-mail: f.barbierato@dfbcert.com
Web-site: www.dfbcert.com
Reg. Imprese, Codice Fiscale e Partiva IVA : REA BG – 399935 (IT) 03690200161
Project No.
ASSESSMENT
REPORT:
1611302246
date
27/06/2017
SAR exclusion on family Type TPM-NK01 made by ADE
Dear Rasin,
accordingly with the SAR document issued by SILICON Labs, issued for the BT121 module, we have
measured the distance between Antenna of the BT121 module and the Hand & Body considered as the
most conservative distance of the plastic cover during the worst case of the operational mode.
As you can see the measures by a caliper shown that we have in any case upper to 7 mm, declared by
SILICON Labs as the limit to determine the SAR measurement.
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Pag. 1 di 9
In this view we measure 9 mm as the minimum distance between the BT Antenna and the cover.
We taking into account that the housing grantee a minimum distance of 7.5 mm as separation between
the Bluetooth antenna inside the device and the closest hand surface in contact with the external device in
the correlated point of the Bluetooth antenna. Accordingly with this our measurements and the SILICON Lab
evaluation about the SAR, we can confirm on the HC1000 that the SAR measurement can be excluded.
As you can check on the following photos the Worst Case is when the HC1000 is take on from the table
(Status 1) in the other case the hand position respect the BT Antenna not cover the BT Antenna area.
Picture 1 - HC1000 is takes from
the table (no BT operates)
Picture 2 - HC1000 during the
use (upper view), pushing the
button to active the Bluetooth
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Picture 2 - HC1000 during the
use (lateral bottom view),
pushing the button to active the
Bluetooth
Pag. 2 di 9
Taking into account the requirements of the par.4.3.1 of the 447498 D01 General RF Exposure Guidance
v06 we have measured the relevant distances around the EUT, see following table.
Table of measured distance btw. BT Antenna and the external around surface of the housing of HC1000
Side identification
BT Antenna vs. upper surface (Front)
Distance measure
7,5 mm
BT Antenna vs. bottom surface (Rear)
BT Antenna vs. USB side
BT Antenna vs. LED side
BT Antenna vs. Right side
BT Antenna vs. Left side
9,5 mm
34 mm
65 mm
43 mm
13 mm
Remarks
Worst case,
minor distance from the Body
----Major distance from the Body
-----
65 mm
13 mm
7,5 mm
Front
43 mm
Antenna BT
9,5 mm
Rear
34 mm
Accordingly with the Bluegiga report we can confirm that the Bluetooth transmission operates in the
BT121 module for 300,1ms in a period of 31,6 seconds, we can treat the object of the par.6.3 of the KDB
447489 D01 “General RF Exposure Guidance” v06 and considering the HC1000 as Low transmission
duty factor device.
About the transmission data value we have assumed the data presented in the “Average Time of Occupancy
of Hopping Frequency” of the Test Report of the BT121, Reference number: 280383-1-1 issued by SGS.
The maximum output power of the BT module is 13mW
Really about the Bluetooth, we have been measured 88 dBV/m at distance of 3m on the first prototype of
the HC1000 and measured today at 84 dBV/m on a sample taken random from the production measured
on March 2017.
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Pag. 3 di 9
Note that the HC1000 cannot transmit at the maximum power declared by Bluegiga on the Exemption SAR
letter, equal to 13mW as conducted measurement on the BT121 module tested by SGS in the Report with
Reference number: 280383-1-1.
Accordingly with Mobile and portable device RF exposure and equipment authorization requirements of
the 47 CFR Sections 1.1307, 2.1091, and 2.1093, we apply the requirements of the FCC technical
document: 447498 D01 General RF Exposure Guidance v06 provides guidance pertaining to RF exposure
requirements for mobile and portable device equipment authorizations.
RF Exposure evaluation for Bluetooth on the HC1000
According to the clause 4.3 of the KDB 447498 D01 General RF Exposure Guidance v06, regarding the
standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure
conditions.
The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation
distances ≤ 50 mm are determined by this following formula:
[(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)]
·[√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR,
where
f(GHz) is the RF channel transmit frequency in GHz
Power and distance are rounded to the nearest mW and mm before calculation.
The result is rounded to one decimal place for comparison
Worse case is as below: [2480MHz] 13 mW output power
(13.0 mW / 7.5 mm) ·[√2.480 (GHz)]= 2.73 <3.0 for 1-g SAR from the body
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Pag. 4 di 9
SAR Test Exclusion calculation for TX 125kHz on the HC1000
According to the clause 4.3.1 of the KDB 447498 we calculate the comparison for SAR threshold as follow:
Carrier frequency = 125 kHz
Field Strength at 3m = 62,866 dBµV/m
Output Power = 62,866 – 95.2 = -32,334 dBm
Output Power = 0,001 mW
Minimum separation distance from the Body = 7,5 mm
SAR Exclusion threshold:
KDB 447498 Sect. 4.3.1
Step 1:
Power allowed = 3*(7,5mm)/(0.1GHz) = 71,42mW
Step 2:
Power threshold = 71,42mW + 0 = 71,42 mW
Step 3:
Power threshold = [ 71,42mW * (1+log(100/0.125))] = 278,75 mW
Output power = 0.001 mW < 278,75 mW
In conclusion, SAR measurement is not required.
No simultaneous transmission, between Bluetooth 2,4 GHz and TX 125 kHz,
is possible in the HC1000 version.
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Pag. 5 di 9
Table of measured distance btw. BT Antenna and the external around surface
of the housing of EZ-sensor PAD
Side identification
BT Antenna vs. upper surface (Front)
BT Antenna vs. bottom surface (Rear)
BT Antenna vs. USB side
BT Antenna vs. LED side
BT Antenna vs. Right side
BT Antenna vs. Left side
Distance measure
9,5 mm
7,5 mm
36 mm
80 mm
50 mm
20 mm
Remarks
--Worst case,
minor distance from the Body
--Major distance from the Body
-----
80 mm
50 mm
20 mm
36 mm
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Pag. 6 di 9
9,5 mm
Front
Antenna BT
7,5 mm
Rear
7,5 mm
Front
Accordingly with the Bluegiga report we can confirm that the Bluetooth transmission operates in the
BT121 module for 300,1ms in a period of 31,6 seconds, we can treat the object of the par.6.3 of the KDB
447489 D01 “General RF Exposure Guidance” v06 and considering for the EZ-sensor PAD, as the same
of the HC1000, as Low transmission duty factor device.
About the transmission data value we have assumed the data presented in the “Average Time of Occupancy
of Hopping Frequency” of the Test Report of the BT121, Reference number: 280383-1-1 issued by SGS.
The maximum output power of the BT module is 13mW
Really about the Bluetooth, we have been measured 88 dBV/m at distance of 3m on the first prototype of
the EZ-sensor PAD and measured today at 84 dBV/m on a sample taken random from the production
measured on March 2017.
Note that the EZ-sensor PAD cannot transmit at the maximum power declared by Bluegiga on the Exemption
SAR letter, equal to 13mW as conducted measurement on the BT121 module tested by SGS in the Report
with Reference number: 280383-1-1.
Accordingly with Mobile and portable device RF exposure and equipment authorization requirements of
the 47 CFR Sections 1.1307, 2.1091, and 2.1093, we apply the requirements of the FCC technical
document: 447498 D01 General RF Exposure Guidance v06 provides guidance pertaining to RF exposure
requirements for mobile and portable device equipment authorizations.
RF Exposure evaluation for Bluetooth on the EZ-sensor PAD
According to the clause 4.3 of the KDB 447498 D01 General RF Exposure Guidance v06, regarding the
standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure
conditions.
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Pag. 7 di 9
The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation
distances ≤ 50 mm are determined by this following formula:
[(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)]
·[√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR,
where
f(GHz) is the RF channel transmit frequency in GHz
Power and distance are rounded to the nearest mW and mm before calculation.
The result is rounded to one decimal place for comparison
Worse case is as below: [2480MHz] 13 mW output power
(13.0 mW / 7.5 mm) ·[√2.480 (GHz)]= 2.73 <3.0 for 1-g SAR from the body
SAR Test Exclusion calculation for TX 125kHz on the EZ-sensor PAD
According to the clause 4.3.1 of the KDB 447498 we calculate the comparison for SAR threshold as follow:
Carrier frequency = 125 kHz
Field Strength at 3m = 62,866 dBµV/m
Output Power = 62,866 – 95.2 = -32,334 dBm
Output Power = 0,001 mW
Minimum separation distance from the Body = 7,5 mm
SAR Exclusion threshold:
KDB 447498 Sect. 4.3.1
Step 1:
Power allowed = 3*(7,5mm)/(0.1GHz) = 71,42mW
Step 2:
Power threshold = 71,42mW + 0 = 71,42 mW
Step 3:
Power threshold = [ 71,42mW * (1+log(100/0.125))] = 278,75 mW
Output power = 0.001 mW < 278,75 mW
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Pag. 8 di 9
In conclusion, SAR measurement is not required.
No simultaneous transmission, between Bluetooth 2,4 GHz and TX 125 kHz,
is possible in the EZ-sensor PAD version.
Best regards,
Francesco Barbierato
EMC Senior Engineer
D.F.B. Global Certification S.r.l.
Via Fiume, 35
24030 Paladina (BG) - Italy
Web-site: www.dfbcert.com
Pag. 9 di 9
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Document ID3466414
Application IDCTjLSl41od6jqodcMKNofw==
Document DescriptionRF Exposure
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeRF Exposure Info
Display FormatAdobe Acrobat PDF - pdf
Filesize354.87kB (4435844 bits)
Date Submitted2017-07-15 00:00:00
Date Available2017-07-15 00:00:00
Creation Date2017-06-27 23:09:19
Producing SoftwareMicrosoft: Print To PDF
Document Lastmod2017-06-27 23:09:19
Document TitleRF Exposure
Document Author: Francesco

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