W5O-BT2400PROBattery Tester

Project No: TM-2402000232P FCC ID: W5O-BT2400PRO Page: 1 / 10 Report No.: TMWK2402000517KS Rev.: 00 No.11, Wugong 6th Rd., Wugu Dist., New Taipei City , Taiwan /新北市五股區五工六路11號 t:(886-2) 2299-9720 f:(886-2) 2299-9721 www.sgs.com.tw Unless otherwise stated the results shown in this test report refer only to the sample(s) tested and such sample(s) are retained for 90 days only. 除非另有說明，此報告結果僅對測試之樣品負責，同時此樣品僅保留90天。本報告未經本公司書面許可，不可部份複製。 This document is issued by the Company subject to its General Conditions of Service printed overleaf, available on request or accessible at http://www.sgs.com.tw/Terms-and-Conditions and, for electronic format documents, subject to Terms and Conditions for Electronic Documents at http://www.sgs.com.tw/Terms-and-Conditions. Attention is drawn to the limitation of liability, indemnification and jurisdiction issues defined therein. Any holder of this document is advised that information contained hereon reflects the Company’s findings at the time of its intervention only and within the limits of client’s instruction, if any. The Company’s sole responsibility is to its Client and this document does not exonerate parties to a transaction from exercising all their rights and obligations under the transaction documents. This document cannot be reproduced, except in full, without prior written approval of the Company. Any unauthorized alteration, forgery or falsification of the content or appearance of this document is unlawful and offenders may be prosecuted to the fullest extent of the law. Compliance Certification Services Inc. 程智科技股份有限公司 Member of the SGS Group SAR TEST REPORT FCC 47 CFR § 2.1093 for BATTERY TESTER Model Name.: BT2400PRO Prepared for: DHC Specialty Corp. 7Fl,No.83,Chou Tzu St.Nei Hu,Taipei 114,Taiwan Prepared by Compliance Certification Services Inc. Wugu Lab. No.11, Wugong 6th Rd., Wugu Dist., New Taipei City, Taiwan. Issue Date: July 11, 2024 Note: This document may be altered or revised by Compliance Certification Services Inc. personnel only, and shall be noted in the revision section of the document. The client should not use it to claim product endorsement by TAF, NIST or any government agencies. The test results in the report only apply to the tested sample. . Page: 2 / 10 Report No.: TMWK2402000517KS Rev.: 00 This document cannot be reproduced except in full, without prior written approval of the Company. 本報告未經本公司書面許可，不可部份複製。 Revision History Rev. Issue Date Revisions Effect Page Revised By 00 July 11, 2024 Initial Issue ALL Peggy Tsai Page: 3 / 10 Report No.: TMWK2402000517KS Rev.: 00 This document cannot be reproduced except in full, without prior written approval of the Company. 本報告未經本公司書面許可，不可部份複製。 Table of Contents 1 ATTESTATION OF TEST RESULTS ................................................................... 4 2 TEST METHODOLOGY ........................................................................................ 5 3 DEVICE UNDER TEST (DUT) INFORMATION .................................................... 6 3.1 DUT DESCRIPTION .............................................................................................................. 6 3.2 WIRELESS TECHNOLOGIES ............................................................................................... 6 4 CONDUCTED OUTPUT POWER MEASUREMENTS .......................................... 7 4.1 WI-FI 2.4GHZ (DTS BAND) ................................................................................................... 7 5 ANTENNA LOCATION ......................................................................................... 8 6 RF EXPOSURE CONDITIONS (TEST CONFIGURATIONS) ............................... 9 6.1 STANDALONE SAR TEST EXCLUSION CONSIDERATIONS ............................................ 9 7 FACILITIES ......................................................................................................... 10 Page: 4 / 10 Report No.: TMWK2402000517KS Rev.: 00 This document cannot be reproduced except in full, without prior written approval of the Company. 本報告未經本公司書面許可，不可部份複製。 1 Attestation of Test Results Applicant Name DHC Specialty Corp. Model Name BATTERY TESTER Applicable Standards FCC 47 CFR § 2.1093 KDB 447498 D04 Interim General RF Exposure Guidance v01 Receive EUT Date: February 27, 2024 Date Tested March 19, 2024 Test Results Pass Compliance Certification Services Inc. , tested the above equipment in accordance with the requirements set forth in the above standards. Determination of compliance is based on the results of the compliance measurement,not taking into account measurement instrumentation uncertainy.All indications of Pass/Fail in this report are opinions expressed by Compliance Certification Services Inc, based on interpretations and/or observations of test results. The test results show that the equipment tested is capable of demonstrating compliance with the requirements as documented in this report. Approved & Released By: Tested by: Sky Zhou Asst. Section Manager Compliance Certification Services Inc. Jack Yang Engineer Compliance Certification Services Inc. Page: 5 / 10 Report No.: TMWK2402000517KS Rev.: 00 This document cannot be reproduced except in full, without prior written approval of the Company. 本報告未經本公司書面許可，不可部份複製。 2 Test Methodology All calculations were made in accordance with FCC KDB 447498 D04 Interim General RF Exposure Guidance v01 Page: 6 / 10 Report No.: TMWK2402000517KS Rev.: 00 This document cannot be reproduced except in full, without prior written approval of the Company. 本報告未經本公司書面許可，不可部份複製。 3 Device Under Test (DUT) Information 3.1 DUT Description Applicant Name DHC Specialty Corp. Applicant Address 7Fl,No.83,Chou Tzu St.Nei Hu,Taipei 114,Taiwan Manufacturer Name DHC Specialty Corp. Manufacturer Address 7F.,NO.308,Sec.1,Datong Rd,Xizhi Dist., NEW TAIPEI CITY 22146, TAIWAN Product BATTERY TESTER Trade Name DHC Model No. BT2400PRO Model Discrepancy N/A Device Dimension Overall (Length x Width): 280 mm x 132 mm Overall Diagonal: …

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Small Size 2.4GHz PCB Antenna-AN043 1 KEYWORDS  PCB antenna  Average Gain 2dBi  ESP-WROOM-02  IOT application  2.4 GHz  Inverted F Antenna 2 INTRODUCTION The PCB antenna described in this application note is now used on ESP-WROOM-02 module reference design. However, it can also be used in all 2.4 GHz designs, especially small space is required for the antenna. This application note describes the antenna dimensions, the RF performance and considerations for complying with regulatory limits when using this design. The suggested antenna design requires no more than 15.2 x 5.7 mm of space and ensures a VSWR ratio of less than 2 across the 2.4 GHz ISM band when connected to a 50 ohm source. 3 ANTENNA DESIGN The PCB antenna on the ESP-WROOM-02 Module reference design is a meandered Inverted F Antenna (IFA). The IFA was designed to match an impedance of 50 ohm at 2.45 GHz. Thus no additional matching components are necessary. 3.1 Design Goals The reflection at the feed point of the antenna determines how much of the applied power is delivered to the antenna. A reflection of less than -10 dB across the 2.4 GHz ISM band, when connected to a 50 ohm source, was a design goal. Reflection of less than -10 dB, or VSWR less than 2, ensures that more than 90% of the available power is delivered to the antenna. Bandwidth is in this document defined as the frequency band where more than 90% of the available power is delivered to the antenna. Another design goal was to fit the size of the PCB antenna on the ESP-WROOM-02 Module and to obtain good performance also when it is used in IOT applications. 3.2 Simulation IE3D from Zeland, which is an electromagnetic simulation tool, was used to design the antenna. The accuracy of the simulation is controlled by the mesh. An increase of the mesh increases the simulation time. Thus, for initial simulations mesh = 1 should be used. When a fairly good result is achieved a higher mesh should be used to obtain more accurate results. Comparison of simulation and measurement results shows that the measured reflection is between the result obtained with mesh = 5 and mesh = 1; see Figure 2 for details. Figure 2: Comparison of Simulation and Measurements Results 3.3 Layout and Implementation Small changes of the antenna dimensions may have large impact on the performance. Therefore it is strongly recommended to make an exact copy of the reference design to achieve optimum performance. It is also recommended to use the same thickness and type of PCB material as used in the reference design. To compensate for a thicker/thinner PCB the antenna could be made slightly shorter/longer. Figure 3: Antenna Dimensions L1 3.94 L2 2.70 L3 5.00 L4 2.64 L5 2.00 L6 4.90 W1 0.90 W2 0.50 D1 0.50 D2 0.30 D3 0.30 D4 0.50 D5 1 .40 D6 1 .70 Table 1: Antenna Dimensions 4 TEST RESULTS Reflection, radiation pattern and variation of output power across a wide frequency band were measured to verify the performance of the PCB antenna. 4.1 Reflection All the reflection measurements were performed with a network analyzer connected to a semi-rigid coax cable, which was soldered to the feed point of the antenna. Because of the small size antenna and the small ground plane this kind of measurements is heavily affected by the presence and placement of the coax cable. This influence can result in a small uncertainty in resonance frequency and measured reflection. Typically different placement of the semi-rigid coax cable could change the resonance frequency with 5 -10 MHz and the reflection with 3 - 4 dB. Figure 4: Influence of Plastic Encapsulation and Test Pins The size of the ground plane affects the performance of the PCB antenna. Soldering ESP-WROOM-02 to a test board increases the size of the ground plane and thus the performance is affected. However, bandwidth still can be enough to cover the whole 2.4 GHz ISM band. 4.2 Radiation Pattern The radiation pattern for the antenna implemented on the ESP-WROOM-02 reference design has been measured in an anechoic chamber. Figure 6 through Figure 11 shows radiation patterns for three planes, XY, XZ and YZ, measured with vertical and horizontal polarization. All measurements were performed with 0 dBm output power. Figure 5 shows how the different radiation patters are related to the positioning of the antenna. Figure 5: How to Relate the Antenna to the Radiation Patterns Figure 6:AN043 XY Plane Figure 7:AN043 XZ Plane Figure 7:AN043 YZ Plane 4.3 Output Power To make a realistic bandwidth measurement of the antenna a small test program was used. The test program stepped the center frequency of a carrier from 2.3 to 2.8 GHz. This bandwidth measurement was also done to verify the result from the reflection measurements, described in section 5.1. The output power was measured using max hold on a spectrum analyzer. CC2511 was programmed for 0 dBm output power and the antenna was horizontally oriented and directed towards the receiving antenna. This corresponds to 0° in the XY plane on Figure 6. The bandwidth measurements were not performed with a correction factor on the spectrum analyzer. Thus, the results in Figure 15 and Figure 16 only show the relative changes in output power and not the actual level. Figure 15 shows the bandwidth of the antenna when the dongle is not connected to a computer. The result shows that the antenna has a variation in output power of less than 3 dB across a frequency band of more than 350 MHz. This demonstrates that the antenna has a broadband characteristic. Maximum output power is measured to be at 2.54 GHz. Thus if the same antenna is implemented on a PCB with similar size and if the application is only intended for stand alone usage the antenna could be made slightly longer to obtain best performance at 2.42 GHz. Figure 8:OUTPUT POWER,ESP-WROOM-02 5.4 Spurious Emission and Harmonics Table 2 shows measured output power and emission at the second harmonic. Above the second harmonic no peaks were detected when measuring TX emissi…

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Project No: TM-2402000232P FCC ID: W5O-BT2400PRO Page: 1 / 71 Report No.: TMWK2405001547KR Rev.: 00 No.11, Wugong 6th Rd., Wugu Dist., New Taipei City , Taiwan /新北市五股區五工六路11號 t:(886-2) 2299-9720 f:(886-2) 2299-9721 www.sgs.com.tw Unless otherwise stated the results shown in this test report refer only to the sample(s) tested and such sample(s) are retained for 90 days only. 除非另有說明，此報告結果僅對測試之樣品負責，同時此樣品僅保留90天。本報告未經本公司書面許可，不可部份複製。 This document is issued by the Company subject to its General Conditions of Service printed overleaf, available on request or accessible at http://www.sgs.com.tw/Terms-and-Conditions and, for electronic format documents, subject to Terms and Conditions for Electronic Documents at http://www.sgs.com.tw/Terms-and-Conditions. Attention is drawn to the limitation of liability, indemnification and jurisdiction issues defined therein. Any holder of this document is advised that information contained hereon reflects the Company’s findings at the time of its intervention only and within the limits of client’s instruction, if any. The Company’s sole responsibility is to its Client and this document does not exonerate parties to a transaction from exercising all their rights and obligations under the transaction documents. This document cannot be reproduced, except in full, without prior written approval of the Company. Any unauthorized alteration, forgery or falsification of the content or appearance of this document is unlawful and offenders may be prosecuted to the fullest extent of the law. Compliance Certification Services Inc. 程智科技股份有限公司 Member of the SGS Group RADIO TEST REPORT FCC 47 CFR PART 15 SUBPART C Test Standard FCC Part 15.247 Product name BATTERY TESTER Brand Name DHC Model No. BT2400PRO Test Result Pass Statements of Conformity Determination of compliance is based on the results of the compliance measurement, not taking into account measurement instrumentation uncertainty. The test Result was tested by Compliance Certification Services Inc. The test data, data evaluation, test procedures, and equipment configurations shown in this report were given in ANSI C63.10: 2013 and compliance standards. The test results of this report relate only to the tested sample (EUT) identified in this report. The test Report of full or partial shall not copy. Without written approval of Compliance Certification Services Inc. (Wugu Laboratory). Approved by: Shawn Wu Supervisor This document cannot be reproduced except in full, without prior written approval of the Company. 本報告未經本公司書面許可，不可部份複製。 Page: 2 / 71 Report No.: TMWK2405001547KR Rev.: 00 Revision History Rev. Issue Date Revisions Effect Page Revised By 00 July 11, 2024 Initial Issue ALL Peggy Tsai This document cannot be reproduced except in full, without prior written approval of the Company. 本報告未經本公司書面許可，不可部份複製。 Page: 3 / 71 Report No.: TMWK2405001547KR Rev.: 00 Table of contents 1. GENERAL INFORMATION ............................................................................................... 4 1.1 EUT INFORMATION ......................................................................................................... 4 1.2 EUT CHANNEL INFORMATION ....................................................................................... 5 1.3 ANTENNA INFORMATION ............................................................................................... 5 1.4 MEASUREMENT UNCERTAINTY .................................................................................... 6 1.5 FACILITIES AND TEST LOCATION................................................................................. 6 1.6 INSTRUMENT CALIBRATION ......................................................................................... 7 1.7 SUPPORT AND EUT ACCESSORIES EQUIPMENT ....................................................... 8 1.8 TEST SET UP DIAGRAM ................................................................................................. 8 1.9 TEST PROGRAM ............................................................................................................. 9 1.10 TEST METHODOLOGY AND APPLIED STANDARDS .................................................... 9 2. TEST SUMMARY............................................................................................................ 10 3. DESCRIPTION OF TEST MODES .................................................................................. 11 3.1 THE WORST MODE OF OPERATING CONDITION ...................................................... 11 3.2 THE WORST MODE OF MEASUREMENT..................................................................... 12 3.3 EUT DUTY CYCLE ......................................................................................................... 13 4. TEST RESULT ................................................................................................................ 15 4.1 AC POWER LINE CONDUCTED EMISSION .................................................................. 15 4.2 6DB BANDWIDTH AND OCCUPIED BANDWIDTH(99%) .............................................. 16 4.3 OUTPUT POWER MEASUREMENT .............................................................................. 23 4.4 POWER SPECTRAL DENSITY ...................................................................................... 26 4.5 CONDUCTED BANDEDGE AND SPURIOUS EMISSION .............................................. 30 4.6 RADIATION BANDEDGE AND SPURIOUS EMISSION ................................................. 36 APPENDIX A - PHOTOGRAPHS OF EUT This document cannot be reproduced except in full, without prior written approval of the Company. 本報告未經本公司書面許可，不可部份複製。 Page: 4 / 71 Report No.: TMWK2405001547KR Rev.: 00 1. GENERAL INFORMATION 1.1 EUT INFORMATION Applicant DHC Specialty Corp. 7Fl,No.83,Chou Tzu St.Nei Hu,Taipei 114,Taiwan Manufacturer DHC Specialty Corp. 7F.,NO.308,Sec.1,Datong Rd,Xizhi Dist., NEW TAIPEI CITY 22146, TAIWAN Equipment BATTERY TESTER Model No. BT2400PRO Model …

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