FCC RF Test Report

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Test Report

Honeywell International Inc CT45PL1NE Mobile Computer HD5-CT45PL1NE HD5CT45PL1NE ct45pl1ne

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Test Report No.: W7L-P21080009RF11
VARIANT RADIO TEST REPORT

(FCC Part 15 Subpart C / IC RSS-210)

Applicant: Address:

Honeywell International Inc Honeywell Safety and Productivity Solutions
9680 Old Bailes Road, Fort Mill, SC 29707 United States

Manufacturer: Address:

Honeywell International Inc Honeywell Safety and Productivity Solutions
9680 Old Bailes Road, Fort Mill, SC 29707 United States

Product:

Mobile Computer

Brand Name:

Honeywell

Model Name:

CT45P-L1N-E

FCC ID:

HD5-CT45PL1NE

Date of tests:

Jun. 16, 2021 ~ Sep. 08, 2021

The tests have been carried out according to the requirements of the following standard:

Part 15 Subpart C §15. 225 / IC RSS-210 issue 10(December 2019) RSS-Gen Issue 5 Amendment 1 (March 2019) ANSI C63.10-2013

CONCLUSION: The submitted sample was found to COMPLY with the test requirement

Prepared by Simon Wang Engineer / Mobile Department

Approved by Luke Lu Manager / Mobile Department

Date: Sep. 09, 2021

Date: Sep. 09, 2021

This report is governed by, and incorporates by reference, CPS Conditions of Service as posted at the date of issuance of this report at http://www.bureauveritas.com/home/about-us/our-business/cps/about-us/terms-conditions/and is intended for your exclusive use. Any copying or replication of this report to or for any other person or entity, or use of our name or trademark, is permitted only with our prior written permission. This report sets forth our findings solely with respect to the test samples identified herein. The results set forth in this report are not indicative or representative of the quality or characteristics of the lot from which a test sample was taken or any similar or identical product unless specifically and expressly noted. Our report includes all of the tests requested by you and the results thereof based upon the information that you provided to us. Measurement uncertainty is only provided upon request for accredited tests. You have 60 days from date of issuance of this report to notify us of any material error or omission caused by our negligence or if you require measurement uncertainty; provided, however, that such notice shall be in writing and shall specifically address the issue you wish to raise. A failure to raise such issue within the prescribed time shall constitute you unqualified acceptance of the completeness of this report, the tests conducted and the correctness of the report contents.

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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Report Version 1

Test Report No.: W7L-P21080009RF11

ISSUE NO. W7L-P21080006RF11 W7L-P21080009RF11

Report Revise Record
REASON FOR CHANGE Original release Based on the original report W7L-P21080006RF11 Changing the SIM to 1 Nano SIM and 1 E-SIM

DATE ISSUED Aug. 31, 2021 Sep. 09, 2021

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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Test Report No.: W7L-P21080009RF11
TABLE OF CONTENTS
1. GENERAL DESCRIPTION..........................................................................................................................5
1.1 Applicant ............................................................................................................................................ 5 1.2 Manufacturer......................................................................................................................................5 1.3 General Description Of EUT .............................................................................................................. 5 1.4 Modification of EUT ........................................................................................................................... 5 1.5 Applicable Standards.........................................................................................................................5
2. TEST CONFIGURATION OF EQUIPMENT UNDER TEST........................................................................6
2.1 Descriptions of Test Mode ................................................................................................................. 6 2.2 Test Configurations............................................................................................................................ 7 2.3 Support Equipment ............................................................................................................................ 8 2.4 Test Setup ......................................................................................................................................... 8 2.5 Measurement Results Explanation Example...................................................................................10
3. TEST RESULT .......................................................................................................................................... 11
3.1 20dB and 99% Bandwidth Measurement ........................................................................................ 11 3.2 Frequency Stability Measurement ................................................................................................... 12 3.3 Field Strength of Fundamental Emissions and Mask Measurement ............................................... 14 3.4 Radiated Emissions Measurement..................................................................................................17 3.5 AC Conducted Emission Measurement........................................................................................... 23 3.6 Antenna Requirements .................................................................................................................... 26
4 LIST OF MEASURING EQUIPMENT........................................................................................................27
5 UNCERTAINTY OF EVALUATION...........................................................................................................29

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Summary of Test RESULT

FCC Rule

IC Rule

Description

Limit

Result

Remark

15.225(a)(b)(c)
2.1049 15.225(d)
15.209
15.207 15.225(e)

RSS-Gen 6.7
RSS-210 Annex B.6
-
RSS-210 Annex B.6
RSS-GEN 8.8
Annex B.6

99% Bandwidth

-

Pass

Field Strength of Fundamental Emissions

15.225(a)(b)(c) RSS-210 Annex B.6

20dB Spectrum Bandwidth

2.1049

15.225(d) &

Radiated Emission

15.209 RSS-210 Annex B.6

Pass Pass Pass

AC Conducted Emission 15.207(a)

Pass

Frequency Stability

< ±100 ppm

Pass

-
-
-
Under limit 7.40 dB at 192.96 MHz Under limit 27.98 dB at 1.602 MHz

RSS-Gen

15.203

6.8

Antenna Requirement

N/A

Pass

-

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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1. General Description
1.1 Applicant
Honeywell International Inc Honeywell Safety and Productivity Solutions 9680 Old Bailes Road, Fort Mill, SC 29707 United States

1.2 Manufacturer
Honeywell International Inc Honeywell Safety and Productivity Solutions 9680 Old Bailes Road, Fort Mill, SC 29707 United States

1.3 General Description Of EUT

Items

Description

Tx/Rx Frequency Range

13.553 ~ 13.567MHz

Channel Number

1

20dBW

2.704 kHz

99%OBW

2.297 kHz

Antenna Type

Loop Antenna

Type of Modulation

ASK

Remark: The above EUT's information was declared by manufacturer. Please refer to the specifications or user's manual for more detailed description.

1.4 Modification of EUT
No modifications are made to the EUT during all test items.

1.5 Applicable Standards
According to the specifications of the manufacturer, the EUT must comply with the requirements of the following standards:  FCC Part 15 Subpart C §15.225  ANSI C63.10-2013  RSS-210 Issue 10  RSS-Gen Issue 5

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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2. Test Configuration of Equipment Under Test

2.1 Descriptions of Test Mode

Investigation has been done on all the possible configurations for searching the worst cases. The following table is a list of the test modes shown in this test report.

Test Items

AC Power Line Conducted Emissions

Field Strength of Fundamental Emissions

20dB Spectrum Bandwidth

Frequency Stability

Radiated Emissions 9kHz~30MHz

Radiated Emissions 30MHz~1GHz

Note: 1. The EUT was programmed to be in continuously transmitting mode.

2. The ancillary equipment, NFC card, is used to make the EUT (NFC) continuously transmit at

13.56MHz and is placed around 3 cm gap to the EUT.

3. Pre-Scan has been conducted to determine the worst-case mode from all possible combinations

between available modulations, work in modes and data rates. Selected for the final test as listed

below.

Frequency

Work in Modes

13.56 MHz

Card Emulation Reader/Writer Peer-to-Peer

Remark:
The mark" " means is chosen for testing; The mark" " means is not chosen for testing.

Type
A B F V

Data Rate (Kbps) 106 212 424 848

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2.2 Test Configurations
<AC Conducted Emissions>
< For Fundamental Emissions and Mask and Radiated Emissions Measurement >

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2.3 Support Equipment

Item 1.

Equipment WLAN AP

Trade Name Model Name

NETGARE

R7800

FCC ID PY315100319

2.

Notebook

Lenovo

E407C

ADS-12B-06

3.

Adapter

Honeywell

05010E

FCC sDOC FCC sDoC

Data Cable N/A N/A
N/A

Power Cord unshielded AC I/P cable1.2 m shielded cable DC O/P 1.8 m unshielded AC I/P cable1.2 m
N/A

2.4 Test Setup
The EUT is continuously communicating during the tests. EUT was set in the Hidden menu mode to enable NFC communications. Setup diagram for Conducted Test

Setup diagram for Radiation(9KHz~30MHz) Test

EUT 0.8m

3m Turn Table
Ground Plane Receiver

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Setup diagram for Radiation(Below 1G) Test
Ant. Tower
3m EUT

0.8m

Turn Table

Ground Plane Receiver

1-4m

Setup diagram for AC Conducted Emission Test Vertical Ground Reference Plane

40cm

EUT

Test Receiver

LISN

80cm

Horizontal Ground Reference Plane

Note: 1.Support units were connected to second LISN.

2.Both of LISNs (AMN) are 80 cm from EUT and at least 80

cm

from other units and other metal planes

support. units.

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2.5 Measurement Results Explanation Example
For all conducted test items:
The offset level is set in the spectrum analyzer to compensate the RF cable loss and attenuator factor between EUT conducted output port and spectrum analyzer. With the offset compensation, the spectrum analyzer reading level is exactly the EUT RF output level.
Example: The spectrum analyzer offset is derived from RF cable loss and attenuator factor. Offset = RF cable loss + attenuator factor. Following shows an offset computation example with cable loss 5 dB and 10dB attenuator.
Offset(dB) = RF cable loss(dB) + attenuator factor(dB). = 5 + 10 = 15 (dB)

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3. Test Result
3.120dB and 99% Bandwidth Measurement
3.1.1 Limit of 20dB and 99% Bandwidth
Intentional radiators must be designed to ensure that the 20dB and 99% emission bandwidth in the specific band 13.553~13.567MHz.

3.1.2 Test Procedures
1. The spectrum analyzer connected via a receive antenna placed near the EUT in peak Max hold mode.
2. The resolution bandwidth of 1 kHz and the video bandwidth of 3 kHz were used. 3. Measured the spectrum width with power higher than 20dB below carrier. 4. Measured the 99% OBW.

3.1.3 Test Result of 20dB and 99% Bandwidth

Test Mode :

NFC

Temperature :

23~25

Test Engineer :

Jack Liu

Mode NFC Type F_212 Kbps

Frequency 13.56MHz

Relative Humidity : 60~63%

20dB Bandwidth [kHz] 2.704

99% OBW[kHz] 2.297

20dB Bandwidth & 99% Bandwidth Plot

Graphs

Verdict PASS

NFC Type F_212 Kbps

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3.2 Frequency Stability Measurement
3.2.1 Limit of Frequency Stability
The frequency tolerance of the carrier signal shall be maintained within +/- 0.01% (100ppm) of the operating frequency over a temperature variation of -20 degrees to +50 degrees C at normal supply voltage, and for a variation in the primary supply voltage from 85% to 115% of the rated supply voltage at a temperature of 20 degrees C. For battery operated equipment, the equipment tests shall be performed using a new battery.
3.2.2 Test Procedures
1. The spectrum analyzer connected via a receive antenna placed near the EUT. 2. EUT have transmitted signal and fixed channelize. 3. Set the spectrum analyzer span to view the entire emissions bandwidth. 4. Set RBW = 1 kHz, VBW = 3 kHz with peak detector and maxhold settings. 5. The fc is declaring of channel frequency. Then the frequency error formula is (fc-f)/fc × 106 ppm
and the limit is less than ±100ppm. 6. Extreme temperature rule is -20°C~50°C.
3.2.3 Test Result of Frequency Stability
The NFC Type F_212 Kbps is the worst case, Only report worst mode data

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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NFC Type F_212 Kbps

Voltage vs. Frequency Stability

Voltage (Vac)

Measurement Frequency (MHz)

3.85

13.55998

3.3

13.55998

4.4

13.55998

-

-

-

-

-

-

-

-

-

-

Max.Deviation (MHz)

-0.00002

Max.Deviation (ppm)

-1.47

Limit Test Result

FS < ±100 ppm PASS

Temperature vs. Frequency Stability

Temperature ()

Measurement Frequency (MHz)

-20

13.55998

-10

13.55998

0

13.55998

10

13.55998

20

13.55998

30

13.55998

40

13.55998

50

13.55998

Max.Deviation (MHz)

-0.00002

Max.Deviation (ppm)

-1.47

Limit

FS < ±100 ppm

Test Result

PASS

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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3.3 Field Strength of Fundamental Emissions and Mask Measurement
3.3.1 Limit of Field Strength of Fundamental Emissions and Mask

Rules and specifications

FCC CFR 47 Part 15 section 15.225 IC RSS-210 B.6

Description

Compliance with the spectrum mask is tested with RBW set to 9kHz.

Freq. of Emission (MHz)

Field Strength (V/m) at 30m

Field Strength

Field Strength

(dBV/m) at 30m (dBV/m) at 10m

Field Strength (dBV/m) at 3m

1.705~13.110

30

29.5

48.58

69.5

13.110~13.410

106

40.5

59.58

80.5

13.410~13.553

334

50.5

69.58

90.5

13.553~13.567

15848

84.0

103.08

124.0

13.567~13.710

334

50.5

69.58

90.5

13.710~14.010

106

40.5

59.58

80.5

14.010~30.000

30

29.5

48.58

69.5

3.3.2 Test Procedures
1. Configure the EUT according to ANSI C63.10. The EUT was placed on the top of the turntable 0.8 meter above ground. The phase center of the loop receiving antenna mounted antenna tower was placed 3 meters far away from the turntable.
2. Power on the EUT and all the supporting units. The turntable was rotated by 360 degrees to determine the position of the highest radiation.
3. The height of the receiving antenna was fixed at one meter above ground to find the maximum emissions field strength.
4. For Fundamental emissions, use the receiver to measure QP reading. 5. When the radiated emissions limits are expressed in terms of the average value of the emissions,
and pulsed operation is employed, the measurement field strength shall be determined by averaging over one complete pulse train, including blanking intervals, as long as the pulse train does not exceed 0.1 seconds. As an alternative (provided the transmitter operates for longer than 0.1 seconds) or in cases where the pulse train exceeds 0.1 seconds, the measured field strength shall be determined from the average absolute voltage during a 0.1 second interval during which the field strength is at its maximum value. 6. Compliance with the spectrum mask is tested with RBW set to 9kHz.
Note: Emission level (dBV/m) = 20 log Emission level (V/m).

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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3.3.3 Test Results of Field Strength of Fundamental Emissions and Mask (1.705 MHz ~ 30 MHz)

Test Mode :

NFC (13.56 MHz)

Test Engineer : Jack Liu

Frequencey Range 13.11Hz~14.01MHz

Temperature :

23~25

Relative Humidity : 63~65%

Polarization :

Horizontal

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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Test Mode :

NFC (13.56 MHz)

Test Engineer : Jack Liu

Frequencey Range 13.11Hz~14.01MHz

Temperature :

23~25

Relative Humidity : 63~65%

Polarization :

Vertical

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3.4 Radiated Emissions Measurement

3.4.1

Limit

The field strength of any emissions which appear outside of 13.110 ~14.010MHz band shall not exceed the general radiated emissions limits.

Frequencies (MHz)
0.009~0.490

Field Strength (V/m)
2400/F(kHz)

Measurement Distance (meters) 300

0.490~1.705

24000/F(kHz)

30

1.705~30.0

30

30

30~88

100

3

88~216

150

3

216~960

200

3

Above 960

500

3

3.4.2 Measuring Instrument Setting

The following table is the setting of receiver.

Receiver Parameter Attenuation Frequency Range: 9kHz~150kHz Frequency Range: 150kHz~30MHz Frequency Range: 30MHz~1000MHz

Setting Auto RBW 200Hz for QP RBW 9kHz for QP RBW 120kHz for Peak

Note: The emission limits shown in the above table are based on measurements employing a CISPR quasi-peak detector except for the frequency bands 9-90 kHz, 110-490 kHz. Radiated emission limits in these two bands are based on measurements employing an average detector.

3.4.3 Test Procedures

1. Configure the EUT according to ANSI C63.10. The EUT was placed on the top of the turntable 0.8 meter above ground. The phase center of the receiving antenna mounted on the top of a height-variable antenna tower was placed 3 meters far away from the turntable.
2. Power on the EUT and all the supporting units. The turntable was rotated by 360 degrees to determine the position of the highest radiation.
3. The height of the broadband receiving antenna was varied between one meter and four meters above ground to find the maximum emissions field strength of both horizontal and vertical polarization.
4. For each suspected emissions, the antenna tower was scan (from 1 M to 4 M) and then the

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turntable was rotated (from 0 degree to 360 degrees) to find the maximum reading. 5. Set the test-receiver system to Peak or CISPR quasi-peak Detect Function with specified
bandwidth under Maximum Hold Mode. 6. When the radiated emissions limits are expressed in terms of the average value of the emissions,
and pulsed operation is employed, the measurement field strength shall be determined by averaging over one complete pulse train, including blanking intervals, as long as the pulse train does not exceed 0.1 seconds. As an alternative (provided the transmitter operates for longer than 0.1 seconds) or in cases where the pulse train exceeds 0.1 seconds, the measured field strength shall be determined from the average absolute voltage during a 0.1 second interval during which the field strength is at its maximum value. 7. In case the emission is lower than 30MHz, loop antenna has to be used for measurement and the recorded data should be QP measured by receiver.

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3.4.4 Test Results of Radiated Emissions (9 KHz ~ 30 MHz)

Test Mode :

NFC (13.56 MHz)

Test Engineer : Jack Liu

Frequencey Range 9 KHz ~ 30 MHz

Temperature :

23~25

Relative Humidity : 63~65%

Polarization :

Horizontal

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Test Mode :

NFC (13.56 MHz)

Test Engineer : Jack Liu

Frequencey Range 9 KHz ~ 30 MHz

Temperature :

23~25

Relative Humidity : 63~65%

Polarization :

Vertical

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3.4.5 Test Result of Radiated Spurious Emission (30MHz ~ 1GHz)

Test Mode :

NFC (13.56MHz)

Temperature :

23~25

Test Engineer : Jack Liu

Relative Humidity : 63~65%

Frequencey Range 30MHz~1GHz

Polarization :

Horizontal

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Test Mode :

NFC (13.56MHz)

Test Engineer : Jack Liu

Frequencey Range 30MHz~1GHz

Temperature :

23~25

Relative Humidity : 63~65%

Polarization :

Vertical

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3.5 AC Conducted Emission Measurement

3.5.1 Limit of AC Conducted Emission

For equipment that is designed to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies within the band 150 kHz to 30 MHz shall not exceed the limits in the following table.

Frequency of Emission (MHz)

Conducted Limit (dBV)

Quasi-Peak

Average

0.15-0.5

66 to 56*

56 to 46*

0.5-5

56

46

5-30

60

50

*Decreases with the logarithm of the frequency.

3.5.2 Test Procedures
1. The EUT was placed 0.4 meter from the conducting wall of the shielding room, and it was kept at least 80 centimeters from any other grounded conducting surface.
2.Connect EUT to the power mains through a line impedance stabilization network (LISN). 3.All the support units are connecting to the other LISN. 4.The LISN provides 50 ohm coupling impedance for the measuring instrument. 5.The FCC states that a 50 ohm, 50 microhenry LISN should be used. 6.Both sides of AC line were checked for maximum conducted interference. 7.The frequency range from 150 kHz to 30 MHz was searched. 8.Set the test-receiver system to Peak Detect Function and specified bandwidth (IF Bandwidth =
9kHz) with Maximum Hold Mode. Then measurement is also conducted by Average Detector and Quasi-Peak Detector Function respectively.

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3.5.3 Test Result of AC Conducted Emission

Test Mode : Mode 1

Temperature :

26.6

Test Engineer : Jack Liu

Relative Humidity : 47%

Test Voltage : 120Vac / 60Hz

Phase :

Line

Function Type : Bluetooth Link + WLAN Link + USB Cable (Charging from Adapter)

Fundmental Signal

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Test Mode : Mode 1

Temperature :

26.6

Test Engineer : Jack Liu

Relative Humidity : 47%

Test Voltage : AC 120V/60Hz

Phase :

Neutral

Function Type : Bluetooth Link + WLAN Link + USB Cable (Charging from Adapter)

Fundmental Signal

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3.6 Antenna Requirements
3.6.1 Standard Applicable
Except for special regulations, the Low-power Radio-frequency Devices must not be equipped with any jacket for installing an antenna with extension cable. An intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. The use of a permanently attached antenna or of an antenna that uses a unique coupling to the intentional radiator shall be considered sufficient to comply with the provisions of this Section. The manufacturer may design the unit so that the user can replace a broken antenna, but the use of a standard antenna jack or electrical connector is prohibited.
3.6.2 Antenna Connected Construction
An Loop Antenna design is used.
3.6.3 Antenna Gain
The antenna peak gain of EUT is less than 6 dBi.

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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4 List of Measuring Equipment

Instrument

Manufacturer Model No.

Serial No.

Calibration Date

Due Date

Remark

Spectrum Analyzer Keysight

N9010A MY56070788 2021-01-05 2022-01-04 Conducted

Power Sensor

Keysight U2021XA MY56510025 2021-01-05 2022-01-04 Conducted

Power Sensor

Keysight U2021XA MY57030005 2021-01-05 2022-01-04 Conducted

Power Sensor

Keysight U2021XA MY56510018 2021-01-05 2022-01-04 Conducted

Power Sensor

Keysight U2021XA MY56480002 2021-01-05 2022-01-04 Conducted

Thermal Chamber Howkin

UHL-34 19111801 2021-04-21 2022-04-20 Conducted

Base Station
Signal Generator (Interferer)
Signal Generator (Blocker)

R&S Keysight Keysight

CMW 270 101231 2021-01-05 2022-01-04 Conducted N5182B MY56200384 2021-01-05 2022-01-04 Conducted N5171B MY56200661 2021-01-05 2022-01-04 Conducted

Instrument Manufacturer

Spectrum Analyzer

R&S

Amplifier

Sonoma

Model No. FSV 40 310

Serial No. 101433

Calibration Date
2021-01-05

363917 2021-01-06

Amplifier Schwarzbeck BBV 9718

327

2021-01-06

Amplifier

Narda TTA1840-35-HG 2034380 2020-11-28

Loop Antenna Schwarzbeck

Broadband Antenna

Schwarzbeck

Horn Antenna Schwarzbeck

FMZB 1519B VULB 9168 BBHA 9120 D

1519B-051 9168-757
1677

2020-02-14 2020-09-27 2020-02-14

Horn Antenna COM-POWER AH-1840

101117 2021-06-18

Test Software

Audix

E3

6.111221a

N/A

Filter

Micro-Tronics BRM 50702

G266

N/A

Due Date 2022-01-04 2022-01-05 2022-01-05 2021-11-27 2023-02-13 2023-09-26 2023-02-13 2024-06-17
N/A N/A

Remark Radiation Radiation Radiation Radiation Radiation Radiation Radiation Radiation Radiation Radiation

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Instrument Manufacturer Model No.

LISN

R&S

ENV216

LISN EMI Test Receiver EMI Test Software

R&S R&S Audix

ENV432 ESR3 E3

Serial No. 102125

Calibration Date
2021-01-05

101327 2021-01-06

102143 2021-01-06

N/A

N/A

Due Date Remark 2022-01-04 Conducted 2022-01-05 Conducted
2022-01-05 Conducted

N/A

Conducted

N/A: No Calibration Required
NOTE:. 1. The test was performed in 3m Semi-anechoic Chamber and RF Oven Room. 2. The horn antenna is used only for the measurement of emission frequency above 1GHz if tested. 3. The FCC Site Registration No. is 525120; The Designation No. is CN1171. 4. The IC test Site Registration No. is 21771-1; The CAB Identifier No. is CN0007.

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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5 Uncertainty of Evaluation

Where relevant, the following measurement uncertainty levels have been estimated for tests

performed on the EUT as specified in CISPR 16-4-2:

MEASUREMENT

FREQUENCY

UNCERTAINTY

Conducted emissions

9kHz~30MHz

2.42dB

30MHz ~ 1GMHz

2.50dB

Radiated emission

1GHz ~ 18GHz

3.51dB

18GHz ~ 40GHz

3.96dB

MEASUREMENT Occupied Channel Bandwidth RF output power, conducted
Power density, conducted

UNCERTAINTY ±196.4Hz ±2.31dB ±2.31dB

This uncertainty represents an expanded uncertainty expressed at approximately the 95% confidence level using a coverage factor of k=2.

BV 7Layers Communications Technology (Shenzhen) Co. Ltd

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