FCC Test Report

1. Verification of Conformity

The above equipment was tested by Dongguan Precise Testing Service Co., Ltd. for compliance with the requirements set forth in the FCC Rules and Regulations Part 15, the measurement procedure according to ANSI C63.4:2014. This said equipment in the configuration described in this report shows the maximum emission levels emanating from equipment are within the compliance requirements.

The test results of this report relate only to the tested sample identified in this report.

Tested By: Strive Liang (Liang Faqiang) Apr.11, 2017

Reviewed By: Forrest Lei (Lei Yonggang) May 10, 2017

Approved By: Solger Zhang (Zhang Hongyi) Authorized Officer May 10, 2017

2. System Description

EUT set up procedure:

1. Connect the EUT with PC.
2. Make sure the EUT operates normally during the test.

Test Mode

Note: V means EMI worst mode

3. Measurement Uncertainty

The uncertainty is calculated using the methods suggested in the "Guide to the Expression of Uncertainty in Measurement" (GUM) published by ISO.

• Conducted measurement: +/- 2.75dB
• Radiated measurement: +/- 3.2dB

Summary Of Test Results

4. Product Information

Note: The highest frequency of the internal sources of the EUT is less than 108MHz, the measurement shall only be made up to 1GHz for Radiated Emission.

I/O Port Information

I/O Port of EUT

5. Support Equipment

Note: All the above equipment/cables were placed in worse case positions to maximize emission signals during emission test.

6. Test Facility

7. Test Equipment List

8. FCC Line Conducted Emission Test

8.1. Limits of Line Conducted Emission Test

Note: 1. The lower limit shall apply at the transition frequency. 2. The limit decreases linearly with the logarithm of the frequency in the range 0.15 MHz to 0.50MHz.

8.2. Block Diagram of Test Setup

Description: The test setup for radiated emission testing from 30MHz to 1000MHz involves placing the EUT on a table 0.8 meters high on a metal ground plane. An RX Antenna is positioned 3 meters away, with its feed point adjustable between 1 to 4 meters in height. A spectrum analyzer/receiver is connected to the antenna. The setup for radiated emission testing above 1000MHz is similar, with the EUT on a table 0.8 meters high on a metal ground plane. The RX Antenna is positioned 3 meters away, with its feed point adjustable between 1 to 4 meters. A spectrum analyzer/receiver is connected to the antenna. A system simulator is also shown connected in this setup.

8.3. Procedure of Line Conducted Emission Test

1. The equipment was set up as per the test configuration to simulate typical actual usage per the user's manual. When the EUT is a tabletop system, a wooden table with a height of 0.8 meters is used and is placed on the ground plane as per ANSI C63.4. When the EUT is a floor-standing equipment, it is placed on the ground plane which has a 3-12 mm non-conductive covering to insulate the EUT from the ground plane.
2. Support equipment, if needed, was placed as per ANSI C63.4.
3. All I/O cables were positioned to simulate typical actual usage as per ANSI C63.4.
4. The EUT received charging voltage by adapter which receive AC120V/60Hz power from a LISN.
5. The EUT test program was started. Emissions were measured on each current carrying line of the EUT using a spectrum Analyzer / Receiver connected to the LISN powering the EUT. The LISN has two monitoring points: Line 1 (Hot Side) and Line 2 (Neutral Side). Two scans were taken: one with Line 1 connected to Analyzer / Receiver and Line 2 connected to a 50 ohm load; the second scan had Line 1 connected to a 50 ohm load and Line 2 connected to the Analyzer / Receiver.
6. Analyzer / Receiver scanned from 150 kHz to 30MHz for emissions in each of the test modes.
7. During the above scans, the emissions were maximized by cable manipulation.
8. A scan was taken on both power lines, Line 1 and Line 2, recording at least the six highest emissions.
9. Emission frequency and amplitude were recorded into a computer in which correction factors were used to calculate the emission level and compare reading to the applicable limit. If EUT emission level was less -2dB to the A.V. limit in Peak mode, then the emission signal was re-checked using Q.P and Average detector.

The test data of the worst case condition (mode 1) was reported on the Summary Data page.

8.4. Test Result of Line Conducted Emission Test

LINE CONDUCTED EMISSION TEST-L

Description: Graph showing conducted emission levels on Line L. The graph displays measured values (Peak and Average) against frequency (0.150 MHz to 30.000 MHz) with FCC Class B limits indicated. Data points are provided in a table below the graph.

LINE CONDUCTED EMISSION TEST-N

Description: Graph showing conducted emission levels on Line N. The graph displays measured values (Peak and Average) against frequency (0.150 MHz to 30.000 MHz) with FCC Class B limits indicated. Data points are provided in a table below the graph.

RESULT: PASS

9. FCC Radiated Emission Test

9.1. Limits of Radiated Emission Test

Note: The lower limit shall apply at the transition frequency.

9.1.1 Spectrum Analyzer and Receiver Settings

9.2. Block Diagram of Test Setup

Description: Two block diagrams illustrate the test setups. The first, for Radiated Emission Test 30MHz-1000MHz, shows the EUT on a table 0.8m high, a metal ground plane, an RX Antenna (feed point 1-4m height) 3m away, and a Spectrum Analyzer/Receiver. The second, for Radiated Emission Test Above 1000MHz, shows a similar setup with the EUT on a table 0.8m high on a metal ground plane, an RX Antenna (feed point 1-4m height) 3m away, a Spectrum Analyzer/Receiver, and a System Simulator.

9.3. Procedure of Radiated Emission Test

1. Configure the EUT according to ANSI C63.4. The EUT was placed on the top of the turntable 0.8 meter above ground. The phase center of the receiving antenna mounted on the top of a height-variable antenna tower was placed 3 meters far away from the turntable.
2. Power on the EUT and all the supporting units. The turntable was rotated by 360 degrees to determine the position of the highest radiation.
3. The height of the broadband receiving antenna was varied between one meter and four meters above ground to find the maximum emissions field strength of both horizontal and vertical polarization.
4. For each suspected emissions, the antenna tower was scan (from 1 M to 4 M) and then the turntable was rotated (from 0 degree to 360 degrees) to find the maximum reading.
5. Set the test-receiver system to Peak or CISPR quasi-peak Detect Function with specified bandwidth under Maximum Hold Mode.
6. For emissions above 1GHz, use 1MHz RBW and 3MHz VBW for peak reading. Then 1MHz RBW and 10Hz VBW for average reading in spectrum analyzer.
7. When the radiated emissions limits are expressed in terms of the average value of the emissions, and pulsed operation is employed, the measurement field strength shall be determined by averaging over one complete pulse train, including blanking intervals, as long as the pulse train does not exceed 0.1 seconds. As an alternative (provided the transmitter operates for longer than 0.1 seconds) or in cases where the pulse train exceeds 0.1 seconds, the measured field strength shall be determined from the average absolute voltage during a 0.1 second interval during which the field strength is at its maximum values.

9.4. Test Result of Radiated Emission Test

Radiated Emission Test at 3m Distance(Below 1G)-Horizontal

Description: Graph showing radiated emission levels in horizontal polarization from 30.000 MHz to 1000.00 MHz. The graph displays measured values (Peak) against frequency with FCC Class B limits. Data points are provided in a table below the graph.

Radiated Emission Test at 3m Distance(Below 1G)-Vertical

Description: Graph showing radiated emission levels in vertical polarization from 30.000 MHz to 1000.00 MHz. The graph displays measured values (Peak) against frequency with FCC Class B limits. Data points are provided in a table below the graph.

Radiated Emission Test at 3m Distance(Above 1G)-Horizontal

Description: Graph showing radiated emission levels in horizontal polarization from 1000.00 MHz to 6000.00 MHz. The graph displays measured values (Peak) against frequency with FCC Class B limits. Data points are provided in a table below the graph.

Radiated Emission Test at 3m Distance(Above 1G)-Vertical

Description: Graph showing radiated emission levels in vertical polarization from 1000.00 MHz to 6000.00 MHz. The graph displays measured values (Peak) against frequency with FCC Class B limits. Data points are provided in a table below the graph.

RESULT: PASS

Note: Measurement = Reading + Factor, Over = Measurement – Limit. 6~13GHz at least have 20dB margin. No recording in the test report.

Appendix A: Photographs of Test Setup

Description: This section contains images of the test setups used for compliance testing. The first image shows the FCC Line Conducted Emission Test Setup, featuring equipment like a spectrum analyzer, LISN, and the EUT (keyboard and PC) on a table. The second image displays the FCC Radiated Emission Test Setup, showing the EUT, an antenna tower with an antenna, and testing equipment within an anechoic chamber.

Appendix B: Photographs of EUT

Description: This section provides photographic documentation of the Equipment Under Test (EUT). It includes images showing the EUT from various angles: All View of EUT, Top View of EUT, Bottom View of EUT, Front View of EUT, Back View of EUT, Left View of EUT, Right View of EUT, View of EUT (Port), Open View of EUT, and Internal Views (Internal View of EUT-1, EUT-2, EUT-3, EUT-4, EUT-5). These images detail the physical appearance, ports, and internal components of the Bluetooth mechanical keyboard.