Test report

FCC ID: 2ARMP-DM8856

Test Report

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FCCID_4473137

Shenzhen CTL Testing Technology Co., Ltd. Tel: +86-755-89486194 E-mail: ctl@ctl-lab.com TEST REPORT 47 CFR FCC Part 15 Subpart C 15.231(e) Report Reference No. ................. : CTL1908238012-WF Compiled by: Happy Guo ( position+printed name+signature) (File administrators) Tested by: Nice Nong ( position+printed name+signature) (Test Engineer) Approved by: Ivan Xie ( position+printed name+signature) (Manager) Product Name.............................. : WEATHER STATION Model/Type reference ................. : DM8856 List Model(s) ................................ : N/A Trade Mark ................................... : N/A FCC ID .......................................... : 2ARMP-DM8856 Applicant’s name ........................ : Digi-Max Technology Limited Room 708, Building 3, XIN YUAN, Jinshan Industrial District, Address of applicant .................. : Fuzhou, Fujian, China Test Firm ...................................... : Shenzhen CTL Testing Technology Co., Ltd. Floor 1-A, Baisha Technology Park, No.3011, Shahexi Road, Address of Test Firm .................. : Nanshan District, Shenzhen, China 518055 Test specification ........................ : Standard ........................................ : 47 CFR FCC Part 15 Subpart C 15.231(e) TRF Originator .............................. : Shenzhen CTL Testing Technology Co., Ltd. Master TRF ................................... : Dated 2011-01 Date of receipt of test item ......... : Aug. 29, 2019 Date of sampling ......................... : Aug. 29, 2019 Date of Test Date ......................... : Aug. 29, 2019–Sep. 10, 2019 Data of Issue ................................ : Sep. 11, 2019 Result ........................................... : Pass Shenzhen CTL Testing Technology Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen CTL Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen CTL Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context.

TEST REPORT Sep. 11, 2019 Test Report No. : CTL1908238012-WF Date of issue Equipment under Test : WEATHER STATION Model /Type : DM8856 Listed Models : N/A Applicant : Digi-Max Technology Limited : Room 708, Building 3, XIN YUAN, Jinshan Industrial Address District, Fuzhou, Fujian, China Manufacturer : PUTIAN JOKO ELECTRONIC CO., LTD : NO.4099, GUOHUAN EAST ROAD, SHIXI VILLAGE, Address JIANGKOU TOWN,HANJIANG DISCTRICT, PUTIAN CITY, CHINA Test result Pass * * In the configuration tested, the EUT complied with the standards specified page 5. The test results presented in this report relate only to the object tested. This report shall not be reproduced, except in full, without the written approval of the issuing testing laboratory.

V1.0 Page 3 of 24 Report No.: CTL1908238012-WF ** Modified History ** Version Description Issued Data Report No. Remark Version 1.0 Initial Test Report Release 2019-09-11 CTL1908238012-WF Tracy Qi

V1.0 Page 4 of 24 Report No.: CTL1908238012-WF Table of Contents Page 1. SUMMARY............................................................................................................................................................ 5 1.1. TEST STANDARDS.......................................................................................................................................................... 5 1.2. TEST DESCRIPTION ........................................................................................................................................................ 5 1.3. TEST FACILITY .............................................................................................................................................................. 6 1.4. STATEMENT OF THE MEASUREMENT UNCERTAINTY ............................................................................................................... 6 2. GENERAL INFORMATION....................................................................................................................................... 8 2.1. ENVIRONMENTAL CONDITIONS ........................................................................................................................................ 8 2.2. GENERAL DESCRIPTION OF EUT ...................................................................................................................................... 8 2.3. EQUIPMENTS USED DURING THE TEST .............................................................................................................................. 8 2.4. RELATED SUBMITTAL(S) / GRANT (S) ................................................................................................................................ 9 2.5. MODIFICATIONS ........................................................................................................................................................... 9 3. TEST CONDITIONS AND RESULTS ......................................................................................................................... 10 3.1. CONDUCTED EMISSION (AC MAIN) ............................................................................................................................... 10 3.2. RADIATED EMISSION ................................................................................................................................................... 11 3.3. 20DB BANDWIDTH ..................................................................................................................................................... 16 3.4. DURATION OF TRANSMISSION AND SILENT PERIOD............................................................................................................ 17 3.4. ANTENNA REQUIREMENT ............................................................................................................................................. 19 4. TEST SETUP PHOTOS OF THE EUT ........................................................................................................................ 20 5. EXTERNAL AND INTERNAL PHOTOS OF THE EUT .................................................................................................. 21

V1.0 Page 5 of 24 Report No.: CTL1908238012-WF 1. SUMMARY 1.1. Test Standards The tests were performed according to following standards: FCC Rules Part 15.231: Periodic operation in the band 40.66-40.70 MHz and above 70 MHz. ANSI C63.10:2013 : American National Standard for Testing Unlicensed Wireless Devices 1.2. Test Description FCC and IC Requirements FCC Part 15.207 Conducted Emission N/A FCC Part 15.231(e) Duration of Transmission and Silent Period PASS FCC Part 15.231(e) Electric Field Strength of Fundamental Emission PASS FCC Part 15.205 &15.209& 15.231(e) Electric Field Strength of Spurious Emission PASS FCC Part 15.231(c) -20dB bandwidth PASS Remark: The measurement uncertainty is not included in the test result.

V1.0 Page 6 of 24 Report No.: CTL1908238012-WF 1.3. Test Facility 1.3.1 Address of the test laboratory Shenzhen CTL Testing Technology Co., Ltd. Floor 1-A, Baisha Technology Park, No. 3011, Shahexi Road, Nanshan, Shenzhen 518055 China There is one 3m semi-anechoic chamber and two line conducted labs for final test. The Test Sites meet the requirements in documents ANSI C63.4 and CISPR 22/EN 55022 requirements. 1.3.2 Laboratory accreditation The test facility is recognized, certified, or accredited by the following organizations: CNAS-Lab Code: L7497 Shenzhen CTL Testing Technology Co., Ltd. has been assessed and proved to be in compliance with CNAS-CL01 Accreditation Criteria for Testing and Calibration Laboratories (identical to ISO/IEC 17025: 2005 General Requirements) for the Competence of Testing and Calibration Laboratories. A2LA-Lab Cert. No. 4343.01 Shenzhen CTL Testing Technology Co., Ltd, EMC Laboratory has been accredited by A2LA for technical competence in the field of electrical testing, and proved to be in compliance with ISO/IEC 17025: 2005 General Requirements for the Competence of Testing and Calibration Laboratories and any additional program requirements in the identified field of testing. IC Registration No.: 9518B CAB identifier: CN0041 The 3m alternate test site of Shenzhen CTL Testing Technology Co., Ltd. EMC Laboratory has been registered by Innovation, Science and Economic Development Canada to test to Canadian radio equipment requirements with Registration No.: 9518B on Jan. 22, 2019. FCC-Registration No.: 399832 Designation No.: CN1216 Shenzhen CTL Testing Technology Co., Ltd. EMC Laboratory has been registered and fully described in a report filed with the (FCC) Federal Communications Commission. The acceptance letter from the FCC is maintained in our files. Registration 399832, December 08, 2017. 1.4. Statement of the measurement uncertainty The data and results referenced in this document are true and accurate. The reader is cautioned that there may be errors within the calibration limits of the equipment and facilities. The measurement uncertainty was calculated for all measurements listed in this test report acc. to CISPR 16 - 4 “Specification for radio disturbance and immunity measuring apparatus and methods – Part 4: Uncertainty in EMC Measurements“ and is documented in the Shenzhen CTL Testing Technology Co., Ltd. quality system acc. to DIN EN ISO/IEC 17025. Furthermore, component and process variability of devices similar to that tested may result in additional deviation. The manufacturer has the sole responsibility of continued compliance of the device. Hereafter the best measurement capability for CTL laboratory is reported: Measurement Test Notes Uncertainty Transmitter power conducted ±0.57 dB (1) Transmitter power Radiated ±2.20 dB (1) Conducted spurious emission 9KHz-40 GHz ±2.20 dB (1) Occupied Bandwidth ±0.01ppm (1) Radiated Emission 30~1000MHz ±4.10dB (1) Radiated Emission Above 1GHz ±4.32dB (1)


V1.0 Page 8 of 24 Report No.: CTL1908238012-WF 2. GENERAL INFORMATION 2.1. Environmental conditions During the measurement the environmental conditions were within the listed ranges: Normal Temperature: 25°C Relative Humidity: 55 % Air Pressure: 101 kPa 2.2. General Description of EUT Product Name: WEATHER STATION Model/Type reference: DM8856 Power supply: DC 3V from battery Modulation: ASK Operation frequency: 433.91MHz Channel number: 1 Antenna type: PCB antenna Antenna gain: 0dBi Note: For more details, please refer to the user’s manual of the EUT. 2.3. Equipments Used during the Test Calibration Calibration Test Equipment Manufacturer Model No. Serial No. Date Due Date 3560.6550.1 LISN R&S ENV216 2019/05/20 2020/05/19 2 LISN R&S ESH2-Z5 860014/010 2019/05/20 2020/05/19 Sunol Sciences Bilog Antenna JB1 A061713 2019/05/20 2020/05/19 Corp. EMI Test Receiver R&S ESCI 1166.5950.03 2019/05/20 2020/05/19 Spectrum Analyzer Agilent E4407B MY41440676 2019/05/20 2020/05/19 Spectrum Analyzer Agilent N9020 US46220290 2019/05/20 2020/05/19 Spectrum Analyzer Keysight N9020A MY53420874 2019/05/20 2020/05/19 Controller EM Electronics EM 1000 060859 2019/05/20 2020/05/19 Sunol Sciences Horn Antenna DRH-118 A062013 2019/05/20 2020/05/19 Corp. Active Loop Da Ze ZN30900A / 2019/05/20 2020/05/19 Antenna Amplifier Agilent 8449B 3008A02306 2019/05/20 2020/05/19 Amplifier Agilent 8447D 2944A10176 2019/05/20 2020/05/19 Temperature/Humi Gangxing CTH-608 02 2019/05/20 2020/05/19 dity Meter High-Pass Filter micro-tranics HPM50108 G174 2019/05/20 2020/05/19

V1.0 Page 9 of 24 Report No.: CTL1908238012-WF High-Pass Filter micro-tranics HPM50111 G142 2019/05/20 2020/05/19 HUBER+SUHN SUCOFLEX 2019/05/20 2020/05/19 Coaxial Cables 10m ER 104PEA-10M HUBER+SUHN SUCOFLEX 2019/05/20 2020/05/19 Coaxial Cables 3m ER 104PEA-3M HUBER+SUHN SUCOFLEX 2019/05/20 2020/05/19 Coaxial Cables 3m ER 104PEA-3M RF Cable Megalon RF-A303 N/A 2019/05/20 2020/05/19 Power Sensor Agilent U2021XA MY5365004 2019/05/20 2020/05/19 Power Meter Agilent U2531A TW53323507 2019/05/20 2020/05/19 The calibration interval was one year 2.4. Related Submittal(s) / Grant (s) This submittal(s) (test report) is intended to comply with Section 15.231 of the FCC Part 15, Subpart C Rules. 2.5. Modifications No modifications were implemented to meet testing criteria.

V1.0 Page 10 of 24 Report No.: CTL1908238012-WF 3. TEST CONDITIONS AND RESULTS 3.1. Conducted Emission (AC Main) LIMIT FCC CFR Title 47 Part 15 Subpart C Section 15.207 Limit (dBuV) Frequency range (MHz) 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. TEST CONFIGURATION TEST PROCEDURE 1. The equipment was set up as per the test configuration to simulate typical actual usage per the user’s manual. The EUT is a flood stand system; a wooden table with a height of 0.1 meters is used and is placed on the ground plane as per ANSI C63.10-2013. 2. Support equipment, if needed, was placed as per ANSI C63.10-2013 3. All I/O cables were positioned to simulate typical actual usage as per ANSI C63.10-2013 4. If a EUT received DC power from the USB Port of Notebook PC, the PC’s adapter received AC120V/60Hz power through a Line Impedance Stabilization Network (LISN) which supplied power source and was grounded to the ground plane. 5. All support equipments received AC power from a second LISN, if any. 6. The EUT test program was started. Emissions were measured on each current carrying line of the EUT using a spectrum Analyzer / Receiver connected to the LISN powering the EUT. The LISN has two monitoring points: Line 1 (Hot Side) and Line 2 (Neutral Side). Two scans were taken: one with Line 1 connected to Analyzer / Receiver and Line 2 connected to a 50 ohm load; the second scan had Line 1 connected to a 50 ohm load and Line 2 connected to the Analyzer / Receiver. 7. Analyzer / Receiver scanned from 150 KHz to 30MHz for emissions in each of the test modes. 8. During the above scans, the emissions were maximized by cable manipulation. TEST RESULTS Not applicable for device which is battery supply.

V1.0 Page 11 of 24 Report No.: CTL1908238012-WF 3.2. Radiated Emission Limit For intentional device, according to 15.209(a) the general requirement of field strength of radiated emission from intentional radiators at a distance of 3 meters shall not exceed the following table. Frequency (MHz) Distance (Meters) Radiated (dBμV/m) Radiated (μV/m) 0.009-0.49 3 20log(2400/F(KHz))+40log(300/3) 2400/F(KHz) 0.49-1.705 3 20log(24000/F(KHz))+ 40log(30/3) 24000/F(KHz) 1.705-30 3 20log(30)+ 40log(30/3) 30 30-88 3 40.0 100 88-216 3 43.5 150 216-960 3 46.0 200 Above 960 3 54.0 500 In addition to the provisions of 15.231(b) and RSS 210-A1.1.2, the field strength of emissions from intentional radiators operated under this section shall not exceed the following: [Where F is the frequency in MHz, the formulas for calculating the maximum permitted fundamental field strengths are as follows: for the band 260-470 MHz, μV/m at 3 meters =41.6667(F) - 7083.3333. The maximum permitted unwanted emission level is 20 dB below the maximum permitted fundamental level.] TEST CONFIGURATION (A) Radiated Emission Test Set-Up, Frequency Below 30MHz (B) Radiated Emission Test Set-Up, Frequency below 1000MHz

V1.0 Page 12 of 24 Report No.: CTL1908238012-WF (C) Radiated Emission Test Set-Up, Frequency above 1000MHz Test Procedure 1. Below 1GHz measurement the EUT is placed on a turntable which is 0.8m above ground plane, and above 1GHz measurement EUT was placed on a low permittivity and low loss tangent turn table which is 1.5m above ground plane. 2. Maximum procedure was performed by raising the receiving antenna from 1m to 4m and rotating the turn table from 0℃ to 360℃ to acquire the highest emissions from EUT 3. And also, each emission was to be maximized by changing the polarization of receiving antenna both horizontal and vertical. 4. Repeat above procedures until all frequency measurements have been completed.

V1.0 Page 13 of 24 Report No.: CTL1908238012-WF TEST RESULTS The emissions from 30MHz to 5GHz are measured peak and average level, below 1 GHz measured QP level, detailed test data please see below. Besides, we tested 3 directions and recorded the worst data. Emission Frequency Reading Limit Margin Direction Detector Styles (MHz) (dBuV/m) (dBuV/m) (dB) (H/V) Fundamental 433.91 83.24 92.87 9.63 PK H Spurious 435.87 48.36 52.87 4.51 PK H Harmonics 867.82 50.58 52.87 2.29 PK H Harmonics 1735.64 51.37 52.87 1.50 PK H -- -- -- -- -- -- -- Fundamental 433.91 84.16 92.87 8.71 PK V Spurious 435.87 49.89 52.87 2.98 PK V Harmonics 867.82 50.36 52.87 2.51 PK V Harmonics 1735.64 51.09 52.87 1.78 PK V -- -- -- -- -- -- -- PK AV Emission Frequency AV Factor Limit Margin Direction Level Level Styles (MHz) (dB/m) (dBuV/m) (dB) (H/V) (dBuV/m) (dBuV/m) Fundamental 433.91 83.24 -12.39 70.85 72.87 2.02 H Spurious 435.87 48.36 -12.39 35.97 52.87 16.90 H Harmonics 867.82 50.58 -12.39 38.41 52.87 14.46 H Harmonics 1735.64 51.37 -12.39 38.98 52.87 13.89 H -- -- -- -- -- -- -- -- Fundamental 433.91 84.16 -12.39 71.77 72.87 1.10 V Spurious 435.87 49.89 -12.39 37.50 52.87 15.37 V Harmonics 867.82 50.36 -12.39 37.97 52.87 14.90 V Harmonics 1735.64 51.09 -12.39 38.70 52.87 14.17 V -- -- -- -- -- -- -- -- Note: 1. AV Level (dBuV/m)= PK Level (dBuV/m)+ AV Factor(dB) 2. In a transmit cycle 70ms period found 0.47ms burst 36pcs, the Duty Cycle can calculate as below: Duty Cycle= (0.47*36)/70=0.241 AV Factor=20*log(Duty Cycle)=20*log(0.241)=-12.39 (The plot of Duty Cycle See the follow page)

V1.0 Page 14 of 24 Report No.: CTL1908238012-WF (Transmit cycle 70ms) (Total Bursts in a transmit cycle 36pcs)

V1.0 Page 15 of 24 Report No.: CTL1908238012-WF (0.47ms burst 36pcs)

V1.0 Page 16 of 24 Report No.: CTL1908238012-WF 3.3. 20dB Bandwidth Limit According to 47 CFR 15.231(c) The bandwidth of the emission shall be no wider than 0.25% of the centre frequency for devices operating above 70MHz and below 900MHz. Bandwidth is determined at the points 20dB down from the modulated carrier. Test Configuration Spectrum EUT Analyzer Test Procedure The 20dB bandwidth and 99% bandwidth is measured with a spectrum analyzer connected via a receive antenna placed near the EUT while the EUT is operating in transmission mode. The 20dB bandwidth is defined as the total spectrum the power of which is higher than peak power minus 20dB. The occupied bandwidth (OBW), that is the frequency bandwidth such that, below its lower and above its upper frequency limits, the mean powers radiated are each equal to 0.5 percent of the total mean power radiated by a given emission. Test Results Channel 99% OBW 20dB bandwidth Limit Modulation Frequency Result (KHz) (KHz) (KHz) (MHz) ASK 433.91 66.927 15.46 0.25%*433.91=1084.8 Pass Test plot as follows: ASK Modulation

V1.0 Page 17 of 24 Report No.: CTL1908238012-WF 3.4. Duration of Transmission and Silent Period Limit devices operated under the provisions of this paragraph shall be provided with a means for automatically limiting operation so that the duration of each transmission shall not be greater than one second and the silent period between transmissions shall be at least 30 times the duration of the transmission but in no case less than 10 seconds. Test Configuration Spectrum EUT Analyzer Test Procedure 1. Set SPA Center Frequency = Fundamental frequency, RBW = 100 kHz, VBW =300 kHz, Span = 0Hz. Sweep time =20seconds. 2. Set EUT as normal operation and press Transmitter button. 3. Set SPA View. Delta Mark time. TEST RESULTS duration of each transmission=880ms<1s PASS Silent period between transmissions=30.07s>10s PASS 30 times the duration of the transmission=26.4s<30.07s PASS

V1.0 Page 18 of 24 Report No.: CTL1908238012-WF

V1.0 Page 19 of 24 Report No.: CTL1908238012-WF 3.4. Antenna Requirement Standard Applicable According to FCC Part 15C 15.203 a) An intentional radiator shall be de-signed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. b) The manufacturer may design the unit so that a broken antenna can be replaced by the user, but the use of a standard antenna jack or electrical connector is prohibited. Refer to statement below for compliance. 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. Further, this requirement does not apply to intentional radiators that must be professionally installed. Antenna Connected Construction The antenna used in this product is an internal Antenna, The directional gains of antenna used for transmitting is 0 dBi. Antenna

V1.0 Page 20 of 24 Report No.: CTL1908238012-WF 4. Test Setup Photos of the EUT

V1.0 Page 21 of 24 Report No.: CTL1908238012-WF 5. External and Internal Photos of the EUT External Photos of EUT

V1.0 Page 22 of 24 Report No.: CTL1908238012-WF

V1.0 Page 23 of 24 Report No.: CTL1908238012-WF Internal Photos of EUT Antenna

V1.0 Page 24 of 24 Report No.: CTL1908238012-WF ********************** End of Report **********************


Document Created: 2019-10-09 11:03:41
Document Modified: 2019-10-09 11:03:41
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