FCC TEST REPORT
For
Happy Plugs AB
True wireless earbuds
Test Model: Air 1 Zen
Additional Model No.: N/A
Prepared for
Company: Happy Plugs AB
Address: Kungsgatan 4B, 1 tr, 111 43 Stockholm, Sweden
Prepared by
Company: Shenzhen LCS Compliance Testing Laboratory Ltd.
Address: 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China
Tel: (+86)755-82591330
Fax: (+86)755-82591332
Web: www.LCS-cert.com
Mail: webmaster@LCS-cert.com
Test Sample Details
Date of receipt of test sample: April 02, 2021
Number of tested samples: 1
Serial number: Prototype
Date of Test: April 02, 2021 ~ April 27, 2021
Date of Report: April 28, 2021
Test Summary
The test report corresponds to FCC CFR 47 PART 15 C (15.247).
Trade Mark: Happy Plugs
Test Model: Air 1 Zen
Ratings: Headset: Input: DC 5V Battery: DC 3.7V, 45mAh; Charge Case: Input: DC 5V Battery: DC 3.7V, 600mAh
Result: Positive
Revision History
| Revision | Issue Date | Revisions | Revised By |
|---|---|---|---|
| 000 | April 28, 2021 | Initial Issue | Gavin Liang |
Test Methodology
All measurements were conducted in accordance with ANSI C63.10-2013, American National Standard of Procedures for Compliance Testing of Unlicensed Wireless Devices.
2.1. EUT Configuration
The EUT configuration for testing meets the Commission's requirements and operates in a manner intended to maximize its emission characteristics in a continuous normal application.
2.2. EUT Exercise
The EUT was operated in engineering mode to fix the TX frequency for measurements. Test Procedure KDB558074 D01 15.247 Meas Guidance v05r02 was used. The EUT complies with Sections 15.203, 15.205, 15.207, 15.209 and 15.247 under FCC Rules Part 15 Subpart C.
2.3. General Test Procedures
2.3.1 Conducted Emissions
The EUT was placed on a turntable 0.8 m above the ground plane. Emissions were measured from 0.15 MHz to 30MHz using Quasi-peak and average detector modes.
2.3.2 Radiated Emissions
The EUT was placed on a turntable 0.8 m above the ground plane (below 1GHz) or 1.5 m above the ground plane (above 1GHz). The turntable rotated 360 degrees to determine the maximum emission level. The EUT was positioned 3m from the receiving antenna, which was varied from 1m to 4m. Antenna polarization (horizontal and vertical) was adjusted to find maximum emissions.
System Test Configuration
3.1. Justification
The system was configured for testing in a continuous transmit condition with a 100% duty cycle and an average correction factor of 0.
3.2. EUT Exercise Software
The system was configured for continuous transmission and channel changes using BQB.exe software.
3.5. Equipment Modifications
No modifications were made to the EUT by Shenzhen LCS Compliance Testing Laboratory Ltd.
Summary of Test Results
| FCC Rules | Description of Test | Result | Remark |
|---|---|---|---|
| / | On Time and Duty Cycle | / | Appendix B.1 |
| §15.247(b) | Maximum Conducted Output Power | Compliant | Appendix B.2 |
| §15.247(e) | Power Spectral Density | Compliant | Appendix B.3 |
| §15.247(a)(2) | 6dB Bandwidth | Compliant | Appendix B.4 |
| §15.209, §15.247(d) | Conducted Spurious Emissions | Compliant | Appendix B.6 |
| §15.209, §15.247(d) | Radiated Spurious Emissions | Compliant | Note 1, Appendix B.7 |
| §15.205 | Emissions at Restricted Band | Compliant | Appendix B.8 |
| §15.207(a) | Conducted Emissions | Compliant | Note 1 |
| §15.203 | Antenna Requirements | Compliant | Note 1 |
| §15.247(i)§2.1903 | RF Exposure | Compliant | Note 2 |
Remark:
1. Note 1 – Test results inside test report;
2. Note 2 – Test results in other test report (RF Exposure report);
Test Results
5.1. On Time and Duty Cycle
For reporting purpose only. Please refer to Appendix B.1.
5.2. Maximum Conducted Output Power Measurement
Standard Applicable: For systems using digital modulation in the 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz bands, the maximum conducted output power is 1 Watt.
Test Procedures: The transmitter output was connected to the spectrum analyzer. RBW was set to be greater than or equal to the DTS bandwidth, VBW ≥ 3 × RBW, Span ≥ 3 x RBW, Sweep time = auto couple, Detector = peak, Trace mode = max hold.
Test Result: PASS. Please refer to Appendix B.2.
5.3. Power Spectral Density Measurement
Standard Applicable: For digitally modulated systems, the power spectral density conducted from the intentional radiator to the antenna shall not be greater than 8 dBm in any 3 kHz band during any time interval of continuous transmission.
Test Procedures: RBW = 3 kHz, VBW ≥ 3*RBW, Span to 1.5 times the DTS channel bandwidth, Detector = peak, Sweep time = auto couple, Trace mode = max hold.
Test Result: PASS. Please refer to Appendix B.3.
5.4. 6 dB Spectrum Bandwidth Measurement
Standard Applicable: For digital modulation systems, the minimum 6 dB bandwidth shall be at least 500 kHz.
Test Procedures: RBW = 100KHz, VBW ≥ 3*RBW, Span Frequency > RBW, Detector = Peak, Trace = Max Hold, Sweep Time = 1.067ms.
Test Result: PASS. Please refer to Appendix B.4.
5.5. Radiated Emissions Measurement
Standard Applicable: §15.205 (a) and §15.247 (d). Emissions must comply with limits for restricted bands and general limits.
5.5.6. Results of Radiated Emissions (9 KHz~30MHz)
The amplitude of spurious emissions attenuated by more than 20 dB below the permissible value were not reported.
5.5.7. Results of Radiated Emissions (30MHz~1GHz)
Horizontal:
| No. | Frequency (MHz) | Reading (dBuV) | Factor (dB/m) | Level (dBuV/m) | Limit (dBuV/m) | Margin (dB) | Detector |
|---|---|---|---|---|---|---|---|
| 1 | 51.1209 | 46.83 | -28.95 | 17.88 | 40.00 | -22.12 | QP |
| 2 | 112.1304 | 53.65 | -28.05 | 25.60 | 43.50 | -17.90 | QP |
| 3 | 203.5227 | 49.55 | -30.42 | 19.13 | 43.50 | -24.37 | QP |
| 4 | 304.6099 | 56.62 | -28.12 | 28.50 | 46.00 | -17.50 | QP |
| 5 | 494.1984 | 46.97 | -24.08 | 22.89 | 46.00 | -23.11 | QP |
| 6 | 731.9202 | 44.14 | -20.44 | 23.70 | 46.00 | -22.30 | QP |
Vertical:
| No. | Frequency (MHz) | Reading (dBuV) | Factor (dB/m) | Level (dBuV/m) | Limit (dBuV/m) | Margin (dB) | Detector |
|---|---|---|---|---|---|---|---|
| 1 | 52.3912 | 47.92 | -29.11 | 18.81 | 40.00 | -21.19 | QP |
| 2 | 102.0014 | 52.95 | -27.46 | 25.49 | 43.50 | -18.01 | QP |
| 3 | 236.6447 | 51.55 | -29.69 | 21.86 | 46.00 | -24.14 | QP |
| 4 | 389.3549 | 45.83 | -26.10 | 19.73 | 46.00 | -26.27 | QP |
| 5 | 501.1790 | 43.93 | -23.95 | 19.98 | 46.00 | -26.02 | QP |
| 6 | 860.0352 | 43.04 | -18.79 | 24.25 | 46.00 | -21.75 | QP |
Note:
1). Pre-scan all modes and recorded the worst case results in this report (BT LE (HCH)).
2). Emission level (dBuV/m) = 20 log Emission level (uV/m).
3). Corrected Reading: Antenna Factor + Cable Loss + Read Level = Level.
5.5.8. Results for Radiated Emissions (1 – 26GHz)
BT LE
Channel 0 / 2402 MHz
| Freq. MHz | Reading dBuV | Ant. Fac. dB/m | Pre. Fac. dB | Cab. Loss dB | Measured dBuV/m | Limit dBuV/m | Margin dB | Remark | Pol. |
|---|---|---|---|---|---|---|---|---|---|
| 4804.00 | 55.08 | 33.06 | 35.04 | 3.94 | 57.04 | 74.00 | -16.96 | Peak | Horizontal |
| 4804.00 | 40.36 | 33.06 | 35.04 | 3.94 | 42.32 | 54.00 | -11.68 | Average | Horizontal |
| 4804.00 | 57.97 | 33.06 | 35.04 | 3.94 | 59.93 | 74.00 | -14.07 | Peak | Vertical |
| 4804.00 | 44.56 | 33.06 | 35.04 | 3.94 | 46.52 | 54.00 | -7.48 | Average | Vertical |
Channel 19 / 2440 MHz
| Freq. MHz | Reading dBuV | Ant. Fac. dB/m | Pre. Fac. dB | Cab. Loss dB | Measured dBuV/m | Limit dBuV/m | Margin dB | Remark | Pol. |
|---|---|---|---|---|---|---|---|---|---|
| 4880.00 | 58.06 | 33.16 | 35.15 | 3.96 | 60.03 | 74.00 | -13.97 | Peak | Horizontal |
| 4880.00 | 42.36 | 33.16 | 35.15 | 3.96 | 44.33 | 54.00 | -9.67 | Average | Horizontal |
| 4880.00 | 58.01 | 33.16 | 35.15 | 3.96 | 59.98 | 74.00 | -14.02 | Peak | Vertical |
| 4880.00 | 42.60 | 33.16 | 35.15 | 3.96 | 44.57 | 54.00 | -9.43 | Average | Vertical |
Channel 39 / 2480 MHz
| Freq. MHz | Reading dBuV | Ant. Fac. dB/m | Pre. Fac. dB | Cab. Loss dB | Measured dBuV/m | Limit dBuV/m | Margin dB | Remark | Pol. |
|---|---|---|---|---|---|---|---|---|---|
| 4960.00 | 54.50 | 33.26 | 35.14 | 3.98 | 56.60 | 74.00 | -17.40 | Peak | Horizontal |
| 4960.00 | 43.49 | 33.26 | 35.14 | 3.98 | 45.59 | 54.00 | -8.41 | Average | Horizontal |
| 4960.00 | 53.72 | 33.26 | 35.14 | 3.98 | 55.82 | 74.00 | -18.18 | Peak | Vertical |
| 4960.00 | 42.86 | 33.26 | 35.14 | 3.98 | 44.96 | 54.00 | -9.04 | Average | Vertical |
Notes:
1). Measuring frequencies from 9 KHz~10th harmonic or 26.5GHz (which is less), No emission found between lowest internal used/generated frequency to 30MHz.
2). Radiated emissions measured in frequency range from 9 KHz~10th harmonic or 26.5GHz (which is less) were made with an instrument using Peak detector mode.
3). Data of measurement within this frequency range shown “ --- ” in the table above means the reading of emissions are attenuated more than 20dB below the permissible limits or the field strength is too small to be measured.
Conducted Spurious Emissions and Band Edges Test
Standard Applicable: §15.247 (d).
Test Procedures: The spectrum from 9 kHz to 26.5GHz is investigated with the transmitter set to the lowest, middle, and highest channels. The test setup layout is the same as that shown in section 5.4.4.
EUT Operation during Test: The EUT was programmed to be in continuously transmitting mode.
Test Results: PASS. Please refer to Appendix B.6 for conducted spurious emissions; Please refer to Appendix B.7 for conducted band edge emission.
Remark:
1). Test results including cable loss;
2). "---" means that the fundamental frequency not for 15.209 limits requirement.
3). Not recorded emission from 9 KHz to 30 MHz as emission level at least 20dBc lower than emission limit.
AC Power Line Conducted Emissions
Standard Applicable: §15.207 (a).
The limits for radio frequency voltage conducted back onto the AC power line in the range 150 kHz to 30 MHz are as follows:
| Frequency Range (MHz) | Limits (dBμV) | |
|---|---|---|
| Quasi-peak | Average | |
| 0.15 to 0.50 | 66 to 56* | 56 to 46* |
| 0.50 to 5 | 56 | 46 |
| 5 to 30 | 60 | 50 |
* Decreasing linearly with the logarithm of the frequency.
Test Results: PASS. The test data is provided in the following section.
AC Conducted Emission of charge from power PC mode @ AC 120V/60Hz (worst case)
| No. Mk. | Freq. MHz | Reading dBuV | Correct Factor dB | Measure-ment dBuV | Limit dBuV | Margin dB | Detector | Comment |
|---|---|---|---|---|---|---|---|---|
| 1 * | 0.1590 | 35.03 | 17.17 | 52.20 | 65.52 | -13.32 | QP | |
| 2 | 0.1949 | 14.44 | 17.26 | 31.70 | 53.83 | -22.13 | AVG | |
| 3 | 0.5594 | 19.43 | 15.54 | 34.97 | 56.00 | -21.03 | QP | |
| 4 | 0.5594 | 11.93 | 15.54 | 27.47 | 46.00 | -18.53 | AVG | |
| 5 | 2.4855 | 17.32 | 14.35 | 31.67 | 56.00 | -24.33 | QP | |
| 6 | 2.7554 | 8.39 | 13.86 | 22.25 | 46.00 | -23.75 | AVG | |
| 7 | 6.8414 | 23.14 | 13.24 | 36.38 | 60.00 | -23.62 | QP | |
| 8 | 6.9855 | 11.28 | 13.64 | 24.92 | 50.00 | -25.08 | AVG | |
| 9 | 13.0110 | 30.42 | 13.07 | 43.49 | 60.00 | -16.51 | QP | |
| 10 | 13.0110 | 18.15 | 13.07 | 31.22 | 50.00 | -18.78 | AVG | |
| 11 | 20.1661 | 29.40 | 10.30 | 39.70 | 60.00 | -20.30 | QP | |
| 12 | 22.0561 | 15.67 | 8.96 | 24.63 | 50.00 | -25.37 | AVG |
Neutral:
| No. Mk. | Freq. MHz | Reading Level dBuV | Correct Factor dB | Measure-ment dBuV | Limit dBuV | Margin dB | Detector | Commen |
|---|---|---|---|---|---|---|---|---|
| 1 * | 0.1547 | 35.17 | 17.15 | 52.32 | 65.74 | -13.42 | QP | |
| 2 | 0.1771 | 14.96 | 17.22 | 32.18 | 54.62 | -22.44 | AVG | |
| 3 | 0.5413 | 22.40 | 15.56 | 37.96 | 56.00 | -18.04 | QP | |
| 4 | 0.5503 | 11.10 | 15.55 | 26.65 | 46.00 | -19.35 | AVG | |
| 5 | 2.4811 | 14.84 | 14.33 | 29.17 | 56.00 | -26.83 | QP | |
| 6 | 2.4811 | 8.22 | 14.33 | 22.55 | 46.00 | -23.45 | AVG | |
| 7 | 6.9809 | 23.28 | 13.62 | 36.90 | 60.00 | -23.10 | QP | |
| 8 | 6.9809 | 11.40 | 13.62 | 25.02 | 50.00 | -24.98 | AVG | |
| 9 | 13.0066 | 30.27 | 13.09 | 43.36 | 60.00 | -16.64 | QP | |
| 10 | 13.0066 | 18.51 | 13.09 | 31.60 | 50.00 | -18.40 | AVG | |
| 11 | 28.4506 | 38.20 | 7.41 | 45.61 | 60.00 | -14.39 | QP | |
| 12 | 28.4506 | 22.01 | 7.41 | 29.42 | 50.00 | -20.58 | AVG |
Note:
1). Pre-scan all modes and recorded the worst case results in this report.
2). Margin=Reading level + Correct - Limit
Band-edge Measurements for Radiated Emissions
Standard Applicable: §15.247 (d).
Test Procedures: Antenna-port conducted measurements are used as an alternative to radiated measurements for demonstrating compliance in restricted frequency bands. The test procedures involve checking instrument calibration, connecting the EUT to a spectrum analyzer via a low loss RF cable, setting RBW and VBW, measuring the highest amplitude, and repeating for all frequencies. Conducted output power is measured, and antenna gain is added to determine the EIRP level. The EIRP level is converted to electric field strength. The resultant electric field strength is compared to the applicable regulatory limit.
Test Results: PASS. Please refer to Appendix B.8.
Remark:
1). Test results including cable loss;
2). "---" means that the fundamental frequency not for 15.209 limits requirement;
3). The average measurement was not performed when the peak measured data under the limit of average detection.
4). Detector AV is setting spectrum/receiver. RBW=1MHz/VBW=330Hz/Sweep time=Auto/Detector=Peak.
Antenna Requirements
Standard Applicable: According to antenna requirement of §15.203.
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 a broken antenna can be re-placed by the user, but the use of a standard antenna jack or electrical connector is prohibited.
Antenna Connector Construction: The gains of antenna used for transmitting is 0dBi(Max.), and the antenna is an Internal Antenna and no consideration of replacement.
Results: Compliance.
List of Measuring Equipments
| Item | Equipment | Manufacturer | Model No. | Serial No. | Cal Date | Due Date |
|---|---|---|---|---|---|---|
| 1 | Power Meter | R&S | NRVS | 100444 | 2020-06-22 | 2021-06-21 |
| 2 | Power Sensor | R&S | NRV-Z81 | 100458 | 2020-06-22 | 2021-06-21 |
| 3 | Power Sensor | R&S | NRV-Z32 | 10057 | 2020-06-22 | 2021-06-21 |
| 4 | Test Software | Tonscend | JS1120-2 | / | N/A | N/A |
| 5 | RF Control Unit | Tonscend | JS0806-2 | / | 2020-11-17 | 2021-11-16 |
| 6 | MXA Signal Analyzer | Agilent | N9020A | MY50510140 | 2020-11-17 | 2021-11-16 |
| 7 | DC Power Supply | Agilent | E3642A | N/A | 2020-11-13 | 2021-11-12 |
| 8 | EMI Test Software | AUDIX | E3 | / | N/A | N/A |
| 9 | 3m Semi Anechoic Chamber | SIDT FRANΚΟΝΙΑ | SAC-3M | 03CH03-HY | 2020-06-22 | 2021-06-21 |
| 10 | Positioning Controller | MF | MF7082 | MF78020803 | 2020-06-22 | 2021-06-21 |
| 11 | Active Loop Antenna | SCHWARZBECK | FMZB 1519B | 00005 | 2018-07-26 | 2021-07-25 |
| 12 | By-log Antenna | SCHWARZBECK | VULB9163 | 9163-470 | 2018-07-26 | 2021-07-25 |
| 13 | Horn Antenna | SCHWARZBECK | ВВНА 9120D | 9120D-1925 | 2018-07-02 | 2021-07-01 |
| 14 | Broadband Horn Antenna | SCHWARZBECK | ВВНА 9170 | 791 | 2020-09-20 | 2023-09-19 |
| 15 | Broadband Preamplifier | SCHWARZBECK | BBV9745 | 9719-025 | 2020-06-22 | 2021-06-21 |
| 16 | EMI Test Receiver | R&S | ESR 7 | 101181 | 2020-06-22 | 2021-06-21 |
| 17 | RS SPECTRUM ANALYZER | R&S | FSP40 | 100503 | 2020-11-17 | 2021-11-16 |
| 18 | Broadband Preamplifier | / | BP-01M18G | P190501 | 2020-06-22 | 2021-06-21 |
| 19 | RF Cable-R03m | Jye Bao | RG142 | CB021 | 2020-06-22 | 2021-06-21 |
| 20 | RF Cable-HIGH | SUHNER | SUCOFLEX 106 | 03CH03-HY | 2020-06-22 | 2021-06-21 |
| 21 | 6dB Attenuator | / | 100W/6dB | 1172040 | 2020-06-22 | 2021-06-21 |
| 22 | 3dB Attenuator | / | 2N-3dB | / | 2020-11-17 | 2021-11-16 |
| 23 | EMI Test Receiver | R&S | ESPI | 101840 | 2020-06-22 | 2021-06-21 |
| 24 | Artificial Mains | R&S | ENV216 | 101288 | 2020-06-22 | 2021-06-21 |
| 25 | 10dB Attenuator | SCHWARZBECK | MTS-IMP-136 | 261115-001-0032 | 2020-06-22 | 2021-06-21 |
