RF Exposure Evaluation
This report details the RF exposure evaluation for the 3D printer manufactured by Shenzhen Liandianchuang Technology Co., LTD.
Document Details
| Report Reference No. | LCSA02105168EB |
| Date of Issue | February 19, 2025 |
| Prepared for | Shenzhen Liandianchuang Technology Co.,LTD |
| Applicant Address | 903, Building 3, Jincheng Industrial Park, Laiwushan Community, Dalang Street, Longhua District, Shenzhen |
| Prepared by | Shenzhen LCS Compliance Testing Laboratory Ltd. |
| Laboratory Address | 101, 201 Bldg A & 301 Bldg C, Juji Industrial Park Yabianxueziwei, Shajing Street, Baoan District, Shenzhen, 518000, China |
| Laboratory Contact | Tel: (+86) 755-82591330, Fax: (+86) 755-82591332, Web: www.LCS-cert.com, Mail: webmaster@LCS-cert.com |
| Date of Receipt of Test Sample | February 11, 2025 |
| Number of Tested Samples | 2 |
| Sample No. | A250210078-1, A250210078-2 |
| Serial Number | Prototype |
| Date of Test | February 11, 2025 - February 18, 2025 |
Product Information
| EUT | 3D printer |
|---|---|
| Test Model | SOVOL ZERO |
| Additional Model No. | SV09-SV15, SV09 -SV15 PRO, SV09 -SV15 PLUS, SV09-SV15 MAX, SOVOL ZERO, SOVOL ZERO PRO, SOVOL ZERO PLUS, SOVOL ZERO MAX, SV08 PLUS, SV08 MINI, SV08 PRO MAX |
| Model Declaration | PCB board, structure and internal of these model(s) are the same, so no additional models were tested. |
| Ratings | Input: AC 100-240V, 50/60Hz, 3A Max |
| Hardware Version | N/A |
| Software Version | N/A |
| WIFI (2.4G Band) | |
| Frequency Range | 2412 MHz ~ 2462 MHz |
| Channel Spacing | 5 MHz |
| Channel Number | 11 Channels for 20MHz bandwidth (2412-2462MHz) |
| Modulation Type | IEEE 802.11b: DSSS (CCK, DQPSK, DBPSK) IEEE 802.11g: OFDM (64QAM, 16QAM, QPSK, BPSK) IEEE 802.11n: OFDM (64QAM, 16QAM, QPSK, BPSK) |
| Antenna Description | External Antenna, 6.8 dB(Max.) |
Evaluation Method
Systems operating under the provisions of FCC 47 CFR section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission's guidelines.
In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091, this device has been defined as a mobile device whereby a distance of 0.2 m normally can be maintained between the user and the device, and below RF Permissible Exposure limit shall comply with.
In accordance with KDB447498D01 for Simultaneous transmission MPE test exclusion applies when the sum of the MPE ratios for all simultaneous transmitting antennas incorporated in a host device, based on the calculated/estimated, numerically modelled or measured field strengths or power density, is ≤ 1.0. The MPE ratio of each antenna is determined at the minimum test separation distance required by the operating configurations and exposure conditions of the host device, according to the ratio of field strengths or power density to MPE limit, at the test frequency. Either the maximum peak or spatially averaged results from measurements or numerical simulations may be used to determine the MPE ratios. Spatial averaging does not apply when MPE is estimated using simple calculations based on far-field plane-wave equivalent conditions. The antenna installation and operating requirements for the host device must meet the minimum test separation distances required by all antennas, in both standalone and simultaneous transmission operations, to satisfy compliance.
Limits
3.1 Refer Evaluation Method
- ANSI C95.1-2019: IEEE Standard for Safety Levels with Respect to Human Exposure to Electric, Magnetic, and Electromagnetic Fields, 0 Hz to 300 GHz
- FCC KDB publication 447498 D01 General 1 RF Exposure Guidance v06: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies.
- FCC CFR 47 part1 1.1310: Radiofrequency radiation exposure limits.
- FCC CFR 47 part2 2.1091: Radiofrequency radiation exposure evaluation: mobile devices.
3.2 Limit
Limits for Maximum Permissible Exposure (MPE)/Controlled Exposure
| Frequency Range(MHz) | Electric Field Strength(V/m) | Magnetic Field Strength(A/m) | Power Density (mW/cm²) | Averaging Time (minute) |
| Limits for Occupational/Controlled Exposure | ||||
| 0.3-3.0 | 614 | 1.63 | (100)* | 6 |
| 3.0-30 | 1842 / f | 4.89 / f | (900 / f²) * | 6 |
| 30-300 | 61.4 | 0.163 | 1.0 | 6 |
| 300-1500 | / | / | f/300 | 6 |
| 1500-100,000 | / | / | 5 | 6 |
Limits for Maximum Permissible Exposure (MPE)/Uncontrolled Exposure
| Frequency Range(MHz) | Electric Field Strength(V/m) | Magnetic Field Strength(A/m) | Power Density (mW/cm²) | Averaging Time (minute) |
| Limits for Occupational/Uncontrolled Exposure | ||||
| 0.3-3.0 | 614 | 1.63 | (100)* | 30 |
| 3.0-30 | 824 / f | 2.19 / f | (180 / f²) * | 30 |
| 30-300 | 27.5 | 0.073 | 0.2 | 30 |
| 300-1500 | / | / | f/1500 | 30 |
| 1500-100,000 | / | / | 1.0 | 30 |
* = Plane-wave equivalent power density
MPE Calculation Method
Predication of MPE limit at a given distance. Equation from page 18 of OET Bulletin 65, Edition 97-01:
S = P * G / (4 * π * R²)
Where: S = power density, P = power input to antenna, G = power gain of the antenna in the direction of interest relative to an isotropic radiator, R = distance to the center of radiation of the antenna.
Antenna Information
EUT can only use antennas certificated as follows provided by manufacturer:
| Internal Identification | Antenna type and antenna number | Operate frequency band | Maximum antenna gain | Note |
| Antenna | External Antenna | 2412 MHz - 2462 MHz | 6.8 dBi (Max.) | WIFI Antenna |
Conducted Power
| Mode | Channel | Frequency(MHz) | Max Conducted Power (dBm) |
| IEEE 802.11b | 1 | 2412 | 15.52 |
| 6 | 2437 | 14.86 | |
| 11 | 2462 | 14.86 | |
| IEEE 802.11g | 1 | 2412 | 13.77 |
| 6 | 2437 | 13.93 | |
| 11 | 2462 | 14.16 | |
| IEEE 802.11n HT20 | 1 | 2412 | 13.39 |
| 6 | 2437 | 13.51 | |
| 11 | 2462 | 12.8 |
Manufacturing Tolerance
<2.4G WIFI>
11B (Peak)
| Channel | Channel 1 | Channel 6 | Channel 11 |
| Target (dBm) | 15.0 | 14.0 | 14.0 |
| Tolerance ±(dB) | 1.0 | 1.0 | 1.0 |
11G (Peak)
| Channel | Channel 1 | Channel 6 | Channel 11 |
| Target (dBm) | 13.0 | 13.0 | 14.0 |
| Tolerance ±(dB) | 1.0 | 1.0 | 1.0 |
11N20SISO (Peak)
| Channel | Channel 1 | Channel 6 | Channel 11 |
| Target (dBm) | 13.0 | 13.0 | 12.0 |
| Tolerance ±(dB) | 1.0 | 1.0 | 1.0 |
Measurement Results
8.1 Standalone MPE Evaluation
As declared by the Applicant, the EUT is a wireless device used in a fix application, at least 20 cm from any body part of the user or nearby persons; from the maximum EUT RF output power, the minimum separation distance, r=20 cm, as well as the gain of the used antenna refer to antenna information, the RF power density can be obtained.
[2.4GWLAN]
| Modulation Type | Output power | Antenna Gain (dBi) | Antenna Gain (linear) | MPE (mW/cm²) | MPE Limits (mW/cm²) | |
| dBm | mW | |||||
| IEEE 802.11b | 16.0 | 39.8107 | 6.8 | 4.7863 | 0.0379 | 1.0000 |
| IEEE 802.11g | 15.0 | 31.6228 | 6.8 | 4.7863 | 0.0301 | 1.0000 |
| IEEE 802.11n HT20 | 14.0 | 25.1189 | 6.8 | 4.7863 | 0.0239 | 1.0000 |
Remark:
- Output power including tune-up tolerance;
- Output power was adjusted to duty cycle at 100% if measured duty cycle less than 98%;
- MPE evaluate distance is 20 cm from user manual provided by manufacturer.
8.2 Simultaneous Transmission MPE Evaluation
The EUT is equipped with one antenna. Therefore, simultaneous transmission evaluation is not required.
Conclusion
The measurement results comply with the FCC Limit per 47 CFR 2.1091 for the uncontrolled RF Exposure of mobile devices.
Description of Test Facility
- NVLAP Accreditation Code is 600167-0.
- FCC Designation Number is CN5024.
- CAB identifier is CN0071.
- CNAS Registration Number is L4595.
- Test Firm Registration Number: 254912.
Measurement Uncertainty
| Test Item | Frequency Range | Uncertainty | Note | |
| Output power | : | 1 GHz - 40 GHz | ± 0.57 dB | (1) |
(1) This uncertainty represents an expanded uncertainty expressed at approximately the 95% confidence level using a coverage factor of k=2.
Revision History
| Report Version | Issue Date | Revision Content | Revised By |
| 000 | February 19, 2025 | Initial Issue | --- |
