TEST REPORT 47 CFR Part 15, Subpart C 15.247

1. SUMMARY

1.1. TEST STANDARDS

The tests were performed according to the following standards:

• 47 CFR Part 15, Subpart C 15.247 Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands of 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz
• ANSI C63.10: 2013: American National Standard for Testing Unlicensed Wireless Devices
• KDB 558074 D01 v05r02: KDB558074 D01 15.247 Meas Guidance v05r02

1.2. Test Description

1.3. Test Facility

Address: Shenzhen CTL Testing Technology Co.,Ltd., Floor 1-A, Baisha Technology Park, No.3011, Shahexi Road, Nanshan District, Shenzhen, China 518055

The test facility includes a 3m semi-anechoic chamber and two line conducted labs, meeting ANSI C63.10 and CISPR 32/EN 55032 requirements.

1.3.2 Laboratory accreditation

The test facility is accredited by CNAS (Lab Code: L7497) and A2LA (Lab Cert. No. 4343.01), demonstrating compliance with ISO/IEC 17025:2017. It is also registered with Innovation, Science and Economic Development Canada (IC Registration No.: 9618B) and the FCC (FCC-Registration No.: 399832, Designation No.: CN1216).

1.4. Statement of the measurement uncertainty

Measurement uncertainties for key tests are reported:

• Transmitter power Radiated: ±2.20 dB
• Radiated Emission 9KHz~30MHz: ±3.66dB
• Radiated Emission 30~1000MHz: ±4.10dB
• Radiated Emission Above 1GHz: ±4.32dB
• DTS Bandwidth: ±1.9%
• Maximum Conducted Output Power: ±1.18 dB
• Maximum Power Spectral Density Level: ±0.98 dB
• Band-edge: ±1.21dB
• Unwanted Emissions In Non-restricted Freq Bands: 9kHz-7GHz: ±1.09dB, 7GHz-26.5GHz: ±3.27dB

These uncertainties represent an expanded uncertainty at a 95% confidence level (k=1.96).

2. GENERAL INFORMATION

2.1. Environmental conditions

• Normal Temperature: 25°C
• Relative Humidity: 55 %
• Air Pressure: 101 kPa

2.2. General Description of EUT

Product Name: Automotive diagnostic platform

Model/Type reference: AD310 Pro

Power supply: DC 12V

Bluetooth LE:

• Supported type: Bluetooth Low Energy
• Modulation: GFSK
• Operation frequency: 2402MHz to 2480MHz
• Channel number: 40
• Channel separation: 2MHz
• Antenna type: PCB Antenna
• Antenna gain: 1.74dBi

2.3. Description of Test Modes and Test Frequency

The EUT was tested in continuous transmitting and receiving mode using provided software. Channels 00, 19, and 39 were selected for BLE testing. The operation frequencies tested were 2402MHz, 2404MHz, 2406MHz, 2440MHz, 2476MHz, 2478MHz, and 2480MHz.

2.4. Equipments Used during the Test

Conducted Emission Equipment:

• EMI Test Receiver: ROHDE & SCHWARZ ESCI, S/N: 1166.5950.03
• LISN: ROHDE & SCHWARZ ESH2-Z5, S/N: 860014/010
• Limitator: ROHDE & SCHWARZ ESH3-Z2, S/N: 100408
• Software: ES-K1 (V1.71)

Radiated Emission Equipment:

• Active Loop Antenna: Da Ze ZN30900A
• Double cone logarithmic antenna: Schwarzbeck VULB 9168
• Horn Antenna: Sunol Sciences Corp. DRH-118, Ocean Microwave OBH100400
• Amplifier: MRT-AP01M06, Agilent 8449B, Brief&Smart LNA-4018
• EMI Test Receiver: ROHDE & SCHWARZ ESCI
• Spectrum Analyzer: RS FSP
• Software: EZ_EMC (V1.1.4.2)

RF Conducted Equipment:

• Spectrum Analyzer: Keysight N9020A
• Temperature/Humidity Meter: Ji Yu MC501
• Software: TST-PASS (V2.0)

2.5. Related Submittal(s) / Grant (s)

This test report is intended to comply with Section 15.247 of the FCC Part 15, Subpart C Rules.

2.6. Modifications

No modifications were implemented to meet testing criteria.

3. TEST CONDITIONS AND RESULTS

3.1. Conducted Emissions Test

Limit: FCC CFR Title 47 Part 15 Subpart C Section 15.207

* Decreases with the logarithm of the frequency.

Test Configuration: The test setup involves the EUT, an adapter, a Line Impedance Stabilization Network (LISN), and a Test Receiver, typically within a shielded room. The EUT is placed on a wooden table 0.8m above the ground plane.

Test Procedure: Emissions were measured on each current carrying line of the EUT using a spectrum analyzer/receiver connected to the LISN. Scans were performed from 150 KHz to 30MHz. Emissions were maximized by cable manipulation.

Test Results: The DC power supply device of this product is not applicable to this test item.

3.2. Radiated Emissions and Band Edge

Limit: According to § 15.209(a), radiated emissions out of the authorized band shall not exceed specified field strength limits at a 3-meter measurement distance. Emissions in restricted bands must also comply with these limits.

Test Configuration:

• (A) Below 30MHz: EUT on a turntable (0.8m high), 3m distance to RX Antenna.
• (B) Below 1000MHz: EUT on a turntable (0.8m high), 3m distance to RX Antenna, with amplifier.
• (C) Above 1000MHz: EUT on a turntable (1.5m high), 3m distance to RX Antenna, with amplifier.

Test Procedure: Measurements were performed by adjusting antenna height (1m to 4m) and turntable rotation (0° to 360°). Polarization (horizontal and vertical) was varied to maximize emissions. The EUT was pretested in X, Y, and Z orientations, with X-plane results reported as the worst case.

Test Results:

• For frequencies below 1GHz, the worst-case emissions were recorded at the BLE low channel.
• Radiated emission tests from 9 KHz to the 10th harmonic were verified. Emissions from 9 kHz to 30MHz were attenuated by more than 20dB below the limits and thus not recorded.
• 30MHz-1GHz (Horizontal & Vertical): Emissions were measured. All recorded emissions were below the limit of 46.0 dBuV/m, with margins generally ranging from 8.55 dB to 16.31 dB.
• 1GHz-25GHz (Horizontal & Vertical): Peak emissions were measured. All recorded emissions were below the limit of 74.0 dBuV/m, with margins generally ranging from 21.73 dB to 39.96 dB.
• Band Edges Test (Radiated):
  • CH00 (2402MHz):
    • Horizontal: Peak emission at 2310.000 MHz was 49.95 dBuV/m (Limit 74.0 dBuV/m, Margin 24.05 dB). Peak emission at 2390.000 MHz was 49.38 dBuV/m (Limit 74.0 dBuV/m, Margin 24.62 dB).
    • Vertical: Peak emission at 2310.000 MHz was 49.81 dBuV/m (Limit 74.0 dBuV/m, Margin 24.19 dB). Peak emission at 2390.000 MHz was 50.14 dBuV/m (Limit 74.0 dBuV/m, Margin 23.86 dB).
  • CH39 (2480MHz):
    • Horizontal: Peak emission at 2483.5 MHz was 57.30 dBuV/m (Limit 74.0 dBuV/m, Margin 16.70 dB). Peak emission at 2500 MHz was 50.24 dBuV/m (Limit 74.0 dBuV/m, Margin 23.76 dB).
    • Vertical: Peak emission at 2483.5 MHz was 50.98 dBuV/m (Limit 74.0 dBuV/m, Margin 23.02 dB). Peak emission at 2500 MHz was 49.92 dBuV/m (Limit 74.0 dBuV/m, Margin 24.08 dB).
• Remarks: 18GHz-26GHz emissions with margins less than 6 dB were not recorded. PK detector values were lower than the average limit, negating the need for AV detector measurements.

3.3. Maximum Conducted Output Power

Limit: The Maximum Peak Output Power Measurement is 30dBm.

Test Procedure: The EUT's antenna port was connected to a Spectrum Analyzer via a low loss RF cable. Settings included RBW > DTS bandwidth, VBW = 3xRBW, span = 3xRBW, auto couple sweep time, peak detector, and max hold trace mode. Peak amplitude level was determined using the peak marker function.

Test Results: Raw data reference to Section 3 of document No. CTL2410122023-WF_BLE_Appendix.

3.4. Power Spectral Density

Limit: For digitally modulated systems, the power spectral density shall not be greater than 8 dBm in any 3 kHz band during any time interval of continuous transmission.

Test Procedure: This procedure is used when maximum peak conducted output power is used for compliance. RBW ≥ 3 kHz, VBW ≥ 3x RBW, span = 1.5 times DTS channel bandwidth. Detector set to peak, sweep time auto couple, trace mode max hold. Peak marker function used to determine maximum power level. If limit is exceeded, RBW is reduced (min 3 kHz) and repeated. The resulting peak PSD level must be ≤ 8dBm.

Test Results: Raw data reference to Section 4 of document No. CTL2410122023-WF_BLE_Appendix.

3.5. 6dB Bandwidth

Limit: For digital modulation systems, the minimum 6 dB bandwidth shall be at least 500 kHz.

Test Procedure: The transmitter output was connected to the spectrum analyzer through an attenuator. The bandwidth of the fundamental frequency was measured using a spectrum analyzer with 100 KHz RBW and 300 KHz VBW. The 6dB bandwidth is defined as the total spectrum where power is higher than peak power minus 6dB.

Test Results: Raw data reference to Section 2 of document No. CTL2410122023-WF_BLE_Appendix.

3.6. Out-of-band Emissions

Limit: In any 100 kHz bandwidth outside the operating frequency band, radio frequency power shall be at least 20 dB below the highest level in the 100 kHz bandwidth within the band. If RMS averaging is used, attenuation is 30 dB. Attenuation below general limits in §15.209(a) is not required.

Test Procedure: Transmitter output connected to spectrum analyzer via RF cable. Spectrum analyzer settings: RBW=100 kHz, VBW= 300 kHz, peak detector, max hold. Measurements cover in-band reference level, bandedge, and out-of-band emissions.

Test Results: Raw data reference to Section 5 of document No. CTL2410122023-WF_BLE_Appendix.

3.7. Antenna Requirement

Standard Applicable: FCC 47 CFR Section 15.203 states that intentional radiators must use antennas furnished by the responsible party, prohibiting standard antenna jacks or unique coupling methods unless designed for user replacement of broken antennas.

FCC CFR Title 47 Part 15 Subpart C Section 15.247(b) (4): Output power limits are based on antennas with directional gains not exceeding 6 dBi. If higher gains are used, output power must be reduced accordingly.

Test Result: The maximum gain of the antenna was 1.74dBi.

4. Test Setup Photos of the EUT

The test setup photos show the Ancel AD310 Pro device connected to a laptop and test equipment, positioned on a table within a test chamber equipped with RF shielding panels. The configuration is shown for both general setup and with additional shielding/stacking for specific tests.

5. Photos of the EUT

External Photos: The external photos display the Ancel AD310 Pro automotive diagnostic tool from various angles, showcasing its display screen, control buttons, and the OBD-II connector. One image specifically points out the "Bluetooth Antenna" located on the internal circuit board.

Internal Photos: The internal photos reveal the circuit board layout of the AD310 Pro. Key components visible include the Bluetooth module (identified as TLSR8251), a microcontroller (HDSC HC32F460), and the integrated Bluetooth antenna.