Test Report
Report No.: SZ24100261E01
Summary Information
Applicant: Realme Chongqing Mobile Telecommunications Corp., Ltd.
Product Name: Earphone
Model Name: RMA2415-A
Brand Name: realme
FCC ID: 2AUYFRMA2415-A
Standard(s): 47 CFR Part 15 Subpart B
Receipt Date: 2024-11-05
Test Date: 2024-11-07 to 2024-11-08
Issue Date: 2024-12-13
Edited by: Chen Bilian (Rapporteur)
Approved by: Xiao Xiong (Supervisor)
NOTE: This document is issued by Shenzhen Morlab Communications Technology Co., Ltd. The test report shall not be reproduced except in full without prior written permission of the company. The test results apply only to the particular sample(s) tested and to the specific tests carried out, which is available on request for validation and information confirmed at our website.
Directory
- 1. Technical Information
- 2. Test Results
- 3. 47 CFR Part 15B Requirements
- Annex A Test Uncertainty
- Annex B Testing Laboratory Information
Change History
| Version | Date | Reason for Change |
|---|---|---|
| 1.0 | 2024-12-13 | First edition |
1. Technical Information
Note: Provided by applicant
1.1. Applicant and Manufacturer Information
Applicant: Realme Chongqing Mobile Telecommunications Corp., Ltd.
Applicant Address: No.178 Yulong Avenue, Yufengshan, Yubei District, Chongqing, China
Manufacturer: Realme Chongqing Mobile Telecommunications Corp., Ltd.
Manufacturer Address: No.178 Yulong Avenue, Yufengshan, Yubei District, Chongqing, China
1.2. Equipment Under Test (EUT) Description
Product Name: Earphone
EUT No.: 1#, 2#, 7#
Hardware Version: Earphone: Steel_E1_R&L_V2_1; Charging case: Steel_CHG_B1_V2_1
Software Version: Earphone: V1.1.0.9; Charging case: V007
Frequency Range: Bluetooth: 2402 MHz ~ 2480 MHz
Accessory:
Battery 1 (for Earphone)
Brand Name: ZWDB
Model No.: 501010
Serial No.: (N/A, marked #1 by test site)
Capacity: 40 mAh
Rated Voltage: 3.7V
Charge Limit: 4.2V
Manufacturer: ZHONGSHAN ZHONGWANGDE NEW ENERGY TECHNOLOGY CO.,LTD
Battery 2 (for Charging case)
Brand Name: ZWDB
Model No.: 802034
Serial No.: (N/A, marked #1 by test site)
Capacity: 600mAh
Rated Voltage: 3.7V
Charge Limit: 4.2V
Manufacturer: ZHONGSHAN ZHONGWANGDE NEW ENERGY TECHNOLOGY CO.,LTD
Note: For a more detailed description, please refer to specification or user's manual supplied by the applicant and/or manufacturer.
2. Test Results
2.1. Applied Reference Documents
The objective of the report is to perform testing according to 47 CFR Part 15 Subpart B:
| No. | Identity | Document Title |
|---|---|---|
| 1 | 47 CFR Part 15 | Radio Frequency Devices |
Test detailed items/section required by FCC rules and results are as below:
| No. | Section | Description | Test Date | Test Engineer | Result | Method Determination | Remark |
|---|---|---|---|---|---|---|---|
| 1 | 15.107 | Conducted Emission | 2024.11.08 | Fan Shengquan | PASS | No deviation | |
| 2 | 15.109 | Radiated Emission | 2024.11.07 to 2024.11.08 | Yuan Zihong | PASS | No deviation |
Note 1: The tests were performed according to the method of measurements prescribed in ANSI C63.4-2014.
Note 2: Additions to, deviation, or exclusions from the method shall be judged in the "method determination" column of add, deviate or exclude from the specific method shall be explained in the "Remark" of the above table.
Note 3: When the test result is a critical value, we will use the measurement uncertainty give the judgment result based on the 95% confidence intervals.
2.2. EUT Setup and Operating Conditions
Note: All of the following test modes are tested in all the test items.
Test Item: Radiated Emission
- Mode 1: EUT (Earphone + Charging Case) + Bluetooth Idle + Battery 1 (for Earphone) + Battery 2 (for Charging Case) + Adapter + USB Cable + Charging Mode
- Mode 2: EUT (Earphone) + Bluetooth Link + Battery 1 (for Earphone) + Mobile Phone + Play 1kHz Audio Mode
- Mode 3: EUT (Charging Case) + Bluetooth Idle + Battery 2 (for Charging Case) + Adapter + USB Cable + Charging Mode
Test Item: Conducted Emission
- Mode 1: EUT (Earphone + Charging Case) + Bluetooth Idle + Battery 1 (for Earphone) + Battery 2 (for Charging Case) + Adapter + USB Cable + Charging Mode
- Mode 3: EUT (Charging Case) + Bluetooth Idle + Battery 2 (for Charging Case) + Adapter + USB Cable + Charging Mode
- Mode 4: EUT (Earphone + Charging Case) + Bluetooth Idle + Battery 1 (for Earphone) + Battery 2 (for Charging Case) + USB Cable + PC + PC Adapter + Indirect Power Supply Mode
Remark: The above test mode in boldface (Mode 4) was the worst case of conducted emission test, only the test data of this mode was reported. The above test mode in boldface (Mode 1) was the worst case of radiated emission test, only the test data of this mode was reported.
During the measurement, the environmental conditions were within the listed ranges:
- Temperature (°C): 15 - 35
- Relative Humidity (%): 30 - 60
- Atmospheric Pressure (kPa): 86 - 106
3. 47 CFR Part 15B Requirements
3.1. Conducted Emission
3.1.1. Requirement
According to FCC section 15.107, the radio frequency voltage that is conducted back onto the AC power line on any frequency within the band 150kHz to 30MHz shall not exceed the limits in the following table, as measured using a 50μH/50Ω line impedance stabilization network (LISN).
| Frequency Range (MHz) | Conducted Limit (dBμV) | |
|---|---|---|
| Quasi-peak | Average | |
| 0.15 - 0.50 | 66 to 56 | 56 to 46 |
| 0.50 - 5 | 56 | 46 |
| 5 - 30 | 60 | 50 |
NOTE:
- a) The limit subjects to the Class B digital device.
- b) The lower limit shall apply at the band edges.
- c) The limit decreases linearly with the logarithm of the frequency in the range 0.15 - 0.50MHz.
3.1.2. Test Setup
Please refer to Annex A for the photographs of the Test Configuration.
Diagram Description: The conducted emission test setup involves the EUT placed on an 0.8m high insulating table, 0.4m away from a grounded conducting wall. The EUT is connected to the power mains through a LISN (providing 50Ω/50μH coupling impedance) and a Pulse Limiter, which protects the measuring instrument. The entire test system's factors are calibrated for accurate readings. The power strip or extension cord integrity is ensured for LISN impedance characteristics as per ANSI C63.4-2014.
3.1.3. Test Result
The maximum conducted interference is searched using Peak (PK), Quasi-peak (QP), and Average (AV) detectors. Emission levels exceeding AV and QP limits, or having narrow margins, are re-measured with AV and QP detectors. Tests are performed for both L phase and N phase lines of the power mains connected to the EUT. All test modes are considered. Measurement results are obtained using the formula: E [dBμV] = UR[dBμV] + LCable loss [dB] + AFactor [dB], where UR is the Receiver Reading, AFactor is the Voltage Division Factor of LISN, and LCable loss is the Correction Factor including Pulse Limiter and Cable. The total correction factor (LCable loss and AFactor) is built into the test software.
Test Plot and Suspicious Points:
(Plot A: L Phase)
Test Graph Description: A graph showing Level [dBμV] versus Frequency [Hz] for the L phase, with QP Limit, AV Limit, PK, and AV detector readings plotted.
| No. | Fre. (MHz) | Emission Level (dBμV) | Limit (dBμV) | Power-line | Verdict | ||
|---|---|---|---|---|---|---|---|
| Quasi-peak | Average | Quasi-peak | Average | ||||
| 1 | 0.1545 | 52.26 | 39.33 | 65.76 | 55.76 | Line | PASS |
| 2 | 0.4155 | 37.67 | 29.87 | 57.54 | 47.54 | Line | PASS |
| 3 | 0.4605 | 35.29 | 29.00 | 56.68 | 46.68 | Line | PASS |
| 4 | 1.0184 | 26.05 | 20.74 | 56.00 | 46.00 | Line | PASS |
| 5 | 4.9248 | 27.85 | 22.20 | 56.00 | 46.00 | Line | PASS |
| 6 | 18.0613 | 37.79 | 31.55 | 60.00 | 50.00 | Line | PASS |
(Plot B: N Phase)
Test Graph Description: A graph showing Level [dBμV] versus Frequency [Hz] for the N phase, with QP Limit, AV Limit, PK, and AV detector readings plotted.
| No. | Fre. (MHz) | Emission Level (dBμV) | Limit (dBμV) | Power-line | Verdict | ||
|---|---|---|---|---|---|---|---|
| Quasi-peak | Average | Quasi-peak | Average | ||||
| 1 | 0.1590 | 53.49 | 40.13 | 65.52 | 55.52 | Neutral | PASS |
| 2 | 0.1770 | 49.98 | 37.08 | 64.63 | 54.63 | Neutral | PASS |
| 3 | 0.4290 | 39.29 | 32.22 | 57.27 | 47.27 | Neutral | PASS |
| 4 | 0.8520 | 25.88 | 20.72 | 56.00 | 46.00 | Neutral | PASS |
| 5 | 2.1028 | 24.86 | 19.70 | 56.00 | 46.00 | Neutral | PASS |
| 6 | 19.2786 | 37.76 | 28.72 | 60.00 | 50.00 | Neutral | PASS |
3.2. Radiated Emission
3.2.1. Requirement
According to FCC section 15.109 (a), the field strength of radiated emissions from unintentional radiators at a distance of 3 meters shall not exceed the following values:
| Frequency Range (MHz) | Field Strength Limitation at 3m Measurement Dist | |
|---|---|---|
| (μV/m) | (dBμV/m) | |
| 30.0 - 88.0 | 100 | 20log 100 |
| 88.0 - 216.0 | 150 | 20log 150 |
| 216.0 - 960.0 | 200 | 20log 200 |
| Above 960.0 | 500 | 20log 500 |
As shown in FCC section 15.35(b), for frequencies above 1000MHz, the field strength limits are based on average detector. When average radiated emission measurements are specified in this part, including emission measurements below 1000MHz, there also is a limit on the radio frequency emissions, as measured using instrumentation with a peak detector function, corresponding to 20dB above the maximum permitted average limit for the frequency being investigated unless a different peak emission limit is otherwise specified in the rules.
Note:
- 1) The tighter limit shall apply at the boundary between two frequency range.
- 2) Limitation expressed in dBμV/m is calculated by 20log Emission Level(μV/m).
3.2.2. Frequency Range of Measurement
According to 15.33(b)(1), the frequency range of radiated measurement for the EUT is listed in the following table:
| Highest frequency generated or used in the device or on which the device operates or tunes (MHz) | Upper frequency of measurement range (MHz) |
|---|---|
| Below 1.705 | 30 |
| 1.705-108 | 1000 |
| 108-500 | 2000 |
| 500-1000 | 5000 |
| Above 1000 | 5th harmonic of the highest frequency or 40 GHz, whichever is lower |
3.2.3. Test Setup
1) For radiated emissions from 30MHz to 1GHz
Diagram Description: The setup includes the EUT on a turntable, positioned 0.8m above the ground. A test antenna (Bi-Log for 30MHz-1GHz) is placed 3m away from the EUT, with its height adjustable from 1m to 4m. The antenna is connected to a receiver and pre-amplifier.
2) For radiated emissions above 1GHz
Diagram Description: Similar to the setup for 30MHz-1GHz, but utilizing a Horn Test Antenna for frequencies above 1GHz. The EUT is on a turntable (0.8m height), 3m from the test antenna, with adjustable antenna height (1m-4m). The antenna is connected to a receiver and pre-amplifier.
3.2.4. Test Result
The maximum radiated emission is searched using PK, QP, and AV detectors. Emission levels exceeding limits or having narrow margins are re-measured with AV and QP detectors. Both vertical and horizontal polarizations of the test antenna are considered. All test modes are evaluated. Emissions in the 6GHz-12.5GHz range that are attenuated more than 20 dB below the permissible value do not need to be reported. Measurement results are calculated using the formula: E [dBμV/m] = UR [dBμV] + AT[dB] + AFactor [dB], where UR is the Receiver Reading, Gpreamp is the Preamplifier Gain, and AFactor is the Antenna Factor at 3m. AT represents the Total correction Factor except Antenna, calculated as AT = LCable loss [dB] - Gpreamp [dB]. The total correction Factor AT and AFactor are incorporated into the test software.
Note: All radiated emission tests were performed in X, Y, Z axis direction, and only the worst axis test condition was recorded in this test report.
Test Plot and Suspicious Points:
(Plot A: ANT-Vertical, 30MHz - 1GHz)
Test Graph Description: A graph showing Level [dBuV/m] versus Frequency [MHz] for Vertical antenna polarization, 30MHz to 1GHz, with QP Limit, PK, and QP detector readings plotted.
| No. | Fre. MHz | PK dBμV/m | QP dBμV/m | AV dBμV/m | Limit-PK dBuV/m | Limit-QP dBμV/m | Limit-AV dBμV/m | ANT | Verdict |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 41.1561 | 32.72 | N.A | N.A | N.A | 40.00 | N.A | V | PASS |
| 2 | 85.9746 | 29.64 | N.A | N.A | N.A | 40.00 | N.A | V | PASS |
| 3 | 111.5852 | 35.38 | N.A | N.A | N.A | 43.50 | N.A | V | PASS |
| 4 | 249.2419 | 27.75 | N.A | N.A | N.A | 46.00 | N.A | V | PASS |
| 5 | 360.0270 | 28.06 | N.A | N.A | N.A | 46.00 | N.A | V | PASS |
| 6 | 759.9980 | 26.10 | N.A | N.A | N.A | 46.00 | N.A | V | PASS |
(Plot B: ANT-Vertical, 1GHz - 6GHz)
Test Graph Description: A graph showing Level [dBuV/m] versus Frequency [MHz] for Vertical antenna polarization, 1GHz to 6GHz, with PK Limit, AV Limit, PK, and AV detector readings plotted.
| No. | Fre. MHz | PK dBμV/m | QP dBμV/m | AV dBμV/m | Limit-PK dBuV/m | Limit-QP dBμV/m | Limit-AV dBμV/m | ANT | Verdict |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1117.5196 | 42.99 | N.A | N.A | 74.00 | N.A | 54.00 | V | PASS |
| 2 | 1732.6221 | 34.92 | N.A | N.A | 74.00 | N.A | 54.00 | V | PASS |
| 3 | 2334.3891 | 36.48 | N.A | N.A | 74.00 | N.A | 54.00 | V | PASS |
| 4 | 3475.4126 | 40.67 | N.A | N.A | 74.00 | N.A | 54.00 | V | PASS |
| 5 | 4949.8250 | 44.43 | N.A | N.A | 74.00 | N.A | 54.00 | V | PASS |
| 6 | 5838.3064 | 46.93 | N.A | N.A | 74.00 | N.A | 54.00 | V | PASS |
(Plot C: ANT- Horizontal, 30MHz - 1GHz)
Test Graph Description: A graph showing Level [dBuV/m] versus Frequency [MHz] for Horizontal antenna polarization, 30MHz to 1GHz, with QP Limit, PK, and QP detector readings plotted.
| No. | Fre. MHz | PK dBμV/m | QP dBμV/m | AV dBμV/m | Limit-PK dBuV/m | Limit-QP dBμV/m | Limit-AV dBμV/m | ANT | Verdict |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 86.7507 | 25.09 | N.A | N.A | N.A | 40.00 | N.A | H | PASS |
| 2 | 131.9572 | 27.37 | N.A | N.A | N.A | 43.50 | N.A | H | PASS |
| 3 | 199.8640 | 21.87 | N.A | N.A | N.A | 43.50 | N.A | H | PASS |
| 4 | 360.0270 | 27.21 | N.A | N.A | N.A | 46.00 | N.A | H | PASS |
| 5 | 451.7012 | 26.81 | N.A | N.A | N.A | 46.00 | N.A | H | PASS |
| 6 | 941.8912 | 27.43 | N.A | N.A | N.A | 46.00 | N.A | H | PASS |
(Plot D: ANT- Horizontal, 1GHz - 6GHz)
Test Graph Description: A graph showing Level [dBuV/m] versus Frequency [MHz] for Horizontal antenna polarization, 1GHz to 6GHz, with PK Limit, AV Limit, PK, and AV detector readings plotted.
| No. | Fre. MHz | PK dBμV/m | QP dBμV/m | AV dBμV/m | Limit-PK dBuV/m | Limit-QP dBμV/m | Limit-AV dBμV/m | ANT | Verdict |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1144.5000 | 34.02 | N.A | N.A | 74.00 | N.A | 54.00 | H | PASS |
| 2 | 1607.0000 | 34.29 | N.A | N.A | 74.00 | N.A | 54.00 | H | PASS |
| 3 | 2254.0000 | 36.44 | N.A | N.A | 74.00 | N.A | 54.00 | H | PASS |
| 4 | 3106.5000 | 39.70 | N.A | N.A | 74.00 | N.A | 54.00 | H | PASS |
| 5 | 4219.0000 | 43.15 | N.A | N.A | 74.00 | N.A | 54.00 | H | PASS |
| 6 | 5839.5000 | 47.82 | N.A | N.A | 74.00 | N.A | 54.00 | H | PASS |
Annex A Test Uncertainty
The uncertainty is calculated using the methods suggested in the "Guide to the Expression of Uncertainty in Measurement" (GUM) published by ISO.
Uncertainty of Conducted Emission Measurement
| Measuring Uncertainty for a Level of Confidence of 95%(U=2Uc(y)) | |
|---|---|
| 9kHz-150kHz | ±3.3dB |
| 150kHz-30MHz | ±2.8dB |
Uncertainty of Radiated Emission Measurement
| Measuring Uncertainty for a Level of Confidence of 95%(U=2Uc(y)) | |
|---|---|
| 30MHz-200MHz | ±5.06dB |
| 200MHz-1000MHz | ±5.04dB |
| 1GHz-6GHz | ±5.18dB |
| 6GHz-18GHz | ±5.48dB |
Annex B Testing Laboratory Information
1. Identification of the Responsible Testing Laboratory
Laboratory Name: Shenzhen Morlab Communications Technology Co., Ltd.
Laboratory Address: FL.3, Building A, FeiYang Science Park, No.8 LongChang Road, Block 67, BaoAn District, ShenZhen, GuangDong Province, P. R. China
Telephone: +86 755 36698555
Facsimile: +86 755 36698525
2. Identification of the Responsible Testing Location
Name: Shenzhen Morlab Communications Technology Co., Ltd.
Address: FL.3, Building A, FeiYang Science Park, No.8 LongChang Road, Block 67, BaoAn District, ShenZhen, GuangDong Province, P. R. China
3. Accreditation Certificate
Accredited Testing Laboratory: The FCC designation number is CN1192. Test firm registration number is 226174. (Shenzhen Morlab Communications Technology Co., Ltd.)
4. Test Software Utilized
| Model | Version Number | Producer |
|---|---|---|
| TS+ -[JS32-RE] | Version 2.5.0.6 | Tonscend |
| TS+ -[ JS32-CE] | Version 2.5.0.0 | Tonscend |
5. Test Equipments Utilized
| Description | Model | Serial No. | Manufacturer | Cal. Date | Due. Date |
|---|---|---|---|---|---|
| Bi-Log Antenna | VULB 9163 | 9163-519 | SCHWARZBECK | 2024/6/22 | 2025/6/21 |
| Horn Antenna | BBHA 9120D | 01774 | SCHWARZBECK | 2024/6/22 | 2025/6/21 |
| Receiver | N9038A | MY564000 93 | KEYSIGHT | 2024/1/25 | 2025/1/24 |
| 6db Attenuator | BW-N6W5+ | E191001 | Mini-circuits | 2024/9/11 | 2025/9/10 |
| Preamplifier | S020180L3203 | 61171/611 72 | LUCIX CORP. | 2024/5/30 | 2025/5/29 |
| Preamplifier | S10M100L3802 | 46732 | LUCIX CORP. | 2024/5/30 | 2025/5/29 |
| RF Coaxial Cable | PE330 | MRE001 | Pasternack | N/A | N/A |
| RF Coaxial Cable | CLU18 | MRE002 | Pasternack | N/A | N/A |
| RF Coaxial Cable | CLU18 | MRE003 | Pasternack | N/A | N/A |
| RF Coaxial Cable | BNC | MRE04 | Qualwave | N/A | N/A |
| Receiver | ESPI | 101052 | R&S | 2024/6/3 | 2025/6/2 |
| LISN | NSLK 8127 | 8127449 | Schwarzbeck | 2024/2/2 | 2025/2/1 |
| 10dB Pulse Limiter | VTSD 9561-F | VTSD 9561 F-B #206 | SCHWARZBECK | 2024/5/30 | 2025/5/29 |
| System Simulator | CMW500 | 152038 | R&S | 2024/9/11 | 2025/9/10 |
6. Ancillary Equipment Utilized
| Description | Model | Serial No. | Manufacturer |
|---|---|---|---|
| Mobile Phone | RMX3193 | VGSKUKT85TLFBMPJ | Realme |
| Adapter | HW-059200CHQ | K68249G6209896 | HUAWEI |
| Adapter | VCB3HDUH | N/A | OPPO |
| USB Cable | N/A | N/A | HUAWEI |
| PC | P144G | 20210357 | DELL |
| PC Adapter | HA65NM190 | N/A | DELL |
