FCC Part 15C Test Report

1. SUMMARY OF TEST RESULTS

Test procedures according to the technical standards: FCC Part15 (15.249), Subpart C

Test Lab: Shenzhen DL Testing Technology Co., Ltd.

Address: 101-201, Building C, Shuanghuan, No.8, Baoqing Road, Baolong Industrial Zone, Baolong Street, Longgang District, Shenzhen, Guangdong, China

FCC Test Firm Registration Number: 854456

Designation Number: CN1307

IC Registered No.: 27485

CAB ID.: CN0118

1.1 MEASUREMENT UNCERTAINTY

The reported uncertainty of measurement y ± U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2, providing a level of confidence of approximately 95 %.

2. GENERAL INFORMATION

2.1 GENERAL DESCRIPTION OF EUT

Note: 1. For a more detailed features description, please refer to the manufacturer's specifications or the User's Manual. 2. The EUT's all information provided by client.

Channel List

2.2 DESCRIPTION OF TEST MODES

To investigate the maximum EMI emission characteristics generated from EUT, the test system was pre-scanning tested based on the consideration of following EUT operation mode or test configuration mode which possibly have effect on EMI emission level. Each of these EUT operation mode(s) or test configuration mode(s) mentioned above was evaluated respectively.

Pretest Mode

Final Test Mode (For Conducted & Radiated Emission)

Note: (1) The measurements are performed at the highest, middle, lowest available channels. (2) A new fully charged battery was used for testing during the test.

2.3 BLOCK DIAGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED

Radiated Spurious Emission Test

[Diagram: A single box labeled 'EUT' with an arrow pointing to it, representing the setup for Radiated Spurious Emission Test.]

Conducted Spurious Emission Test

[Diagram: A setup for Conducted Spurious Emission Test showing 'EUT' connected to an 'Adapter' (labeled C1, E-2) which is connected to 'AC Mains'.]

2.4 DESCRIPTION OF SUPPORT UNITS(CONDUCTED MODE)

The EUT has been tested as an independent unit together with other necessary accessories or support units. The following support units or accessories were used to form a representative test configuration during the tests.

2.5 TABLE OF PARAMETERS OF TEST SOFTWARE SETTING

During testing, channel & power controlling software provided by the customer was used to control the operating channel as well as the output power level. The RF output power selection is for the setting of RF output power expected by the customer and is going to be fixed on the end product.

2.6 EQUIPMENTS LIST FOR ALL TEST ITEMS

Radiation test, Band-edge test and 20db bandwidth test equipment

Conduction Test equipment

Other

3. EMC EMISSION TEST

3.1 CONDUCTED EMISSION MEASUREMENT

3.1.1 POWER LINE CONDUCTED EMISSION Limits

(Frequency Range 150KHz-30MHz)

Note: (1) The tighter limit applies at the band edges. (2) The limit of " * " marked band means the limitation decreases linearly with the logarithm of the frequency in the range.

Receiver Parameters

3.1.2 TEST PROCEDURE

a. The EUT was placed 0.8 meters from the horizontal ground plane with EUT being connected to the power mains through a line impedance stabilization network (LISN). All other support equipments powered from additional LISN(s). The LISN provide 50 Ohm/ 50uH of coupling impedance for the measuring instrument.

b. Interconnecting cables that hang closer than 40 cm to the ground plane shall be folded back and forth in the center forming a bundle 30 to 40 cm long.

c. I/O cables that are not connected to a peripheral shall be bundled in the center. The end of the cable may be terminated, if required, using the correct terminating impedance. The overall length shall not exceed 1 m.

d. LISN at least 80 cm from nearest part of EUT chassis.

e. For the actual test configuration, please refer to the related Item – EUT Test Photos.

3.1.3 DEVIATION FROM TEST STANDARD

No deviation

3.1.4 TEST SETUP

[Diagram: A test setup for conducted emissions showing the EUT, LISN, and Test Receiver. The EUT is placed on a table 0.8m from the ground plane, connected to the LISN which is 80cm from the EUT and other metal planes. The Test Receiver is positioned relative to the ground plane.]

3.1.5 EUT OPERATING CONDITIONS

The EUT was configured for testing in a typical fashion (as a customer would normally use it). The EUT has been programmed to continuously transmit during test. This operating condition was tested and used to collect the included data. We pretest AC 120V and AC 230V, the worst voltage was AC 120V and the data recording in the report.

3.1.6 TEST RESULTS

Temperature: 25 °C

Pressure: 1010hPa

Test Voltage: AC 120V/60Hz

Relative Humidity: 54%

Phase: L

Test Mode: Mode 5

[Graph: Conducted Emission test results showing Quasi-peak and Average levels against frequency from 0.150 MHz to 30.000 MHz, with FCC Class B QP and AV limits indicated.]

Remark: Margin = Limit – Level, Correct Factor = Cable lose + LISN insertion loss, Level= Reading + Correct factor

Temperature: 25 °C

Pressure: 1010hPa

Test Voltage: AC 120V/60Hz

Relative Humidity: 54%

Phase: N

Test Mode: Mode 5

[Graph: Conducted Emission test results for Phase N, similar to Phase L, showing Quasi-peak and Average levels against frequency from 0.150 MHz to 30.000 MHz, with FCC Class B QP and AV limits indicated.]

Remark: Margin = Limit – Level, Correct Factor = Cable lose + LISN insertion loss, Level= Reading + Correct factor

3.2 RADIATED EMISSION MEASUREMENT

3.2.1 RADIATED EMISSION LIMITS

(Frequency Range 9kHz-1000MHz)

In case the emission fall within the restricted band specified on 15.205(a), then the 15.209(a) limit in the table below has to be followed.

The field strength of emissions from intentional radiators operated within these frequency bands shall comply with the following:

LIMITS OF RADIATED EMISSION MEASUREMENT (Above 1000MHz)

Notes: (1) The limit for radiated test was performed according to FCC PART 15C. (2) The tighter limit applies at the band edges. (3) Emission level (dBuV/m)=20log Emission level (uV/m).

Receiver setup:

3.2.2 TEST PROCEDURE

Below 1GHz test procedure as below:

a. The EUT was placed on the top of a rotating table 0.8 meters above the ground at a 3 meter semi-anechoic camber. The table was rotated 360 degrees to determine the position of the highest radiation.

b. The EUT was set 3 meters away from the interference-receiving antenna, which was mounted on the top of a variable-height antenna tower.

c. The antenna height is varied from one meter to four meters above the ground to determine the maximum value of the field strength. Both horizontal and vertical polarizations of the antenna are set to make the measurement.

d. For each suspected emission, the EUT was arranged to its worst case and then the antenna was tuned to heights from 1 meter to 4 meters (for the test frequency of below 30MHz, the antenna was tuned to heights 1 meter) and the rotatable table was turned from 0 degrees to 360 degrees to find the maximum reading.

e. The test-receiver system was set to Peak Detect Function and Specified Bandwidth with Maximum Hold Mode.

f. If the emission level of the EUT in peak mode was 10dB lower than the limit specified, then testing could be stopped and the peak values of the EUT would be reported. Otherwise the emissions that did not have 10dB margin would be re-tested one by one using peak, quasi-peak or average method as specified and then reported in a data sheet.

Above 1GHz test procedure as below:

g. The EUT was placed on the top of a rotating table 0.8 meters above the ground at a 3 meter semi-anechoic camber. (Above 18GHz the distance is 3 meter and table is 1.5 metre).

h. Test the EUT in the lowest channel, the middle channel, the Highest channel

Note: Both horizontal and vertical antenna polarities were tested and performed pretest to three orthogonal axis. The worst case emissions were reported

3.2.3 DEVIATION FROM TEST STANDARD

No deviation

3.2.4 TEST SETUP

(A) Radiated Emission Test-Up Frequency Below 30MHz

[Diagram: A semi-anechoic 3m chamber setup for radiated emission testing below 30MHz. It shows an EUT on a turn table 0.8m above the ground, with a 1m antenna height. PC System, Spectrum Analyzer, AMP, and Combining Network are connected.]

(B) Radiated Emission Test-Up Frequency 30MHz~1GHz

[Diagram: A semi-anechoic 3m chamber setup for radiated emission testing from 30MHz to 1GHz. It shows an EUT on a turn table 0.8m above the ground, with antenna elevation varying from 1 to 4m. The distance to the antenna is 3m. PC System, Spectrum Analyzer, AMP, and Combining Network are connected.]

(C) Radiated Emission Test-Up Frequency Above 1GHz

[Diagram: An aechoic 3m chamber setup for radiated emission testing above 1GHz. It shows an EUT on a turn table 1.5m above the ground, with antenna elevation varying from 1 to 4m. The distance to the antenna is 3m. Absorbers are present. PC System, Spectrum Analyzer, AMP, and Combining Network are connected.]

3.2.5 EUT OPERATING CONDITIONS

The EUT tested system was configured as the statements of 2.3 Unless otherwise a special operating condition is specified in the follows during the testing.

3.2.6 TEST RESULTS (BETWEEN 9KHZ 30 MHZ)

Temperature: 20 °C

Pressure: 1010 hPa

Test Mode : Mode 4

Relative Humidity: 48%

Test Voltage: DC 3.7V

Polarization :

NOTE: The amplitude of spurious emissions which are attenuated by more than 20dB below the permissible value has no need to be reported. Distance extrapolation factor =40 log (specific distance/test distance)(dB); Limit line = specific limits(dBuV) + distance extrapolation factor.

3.2.7 TEST RESULTS (BETWEEN 30MHZ 1GHZ)

Temperature: 26°C

Pressure: 1010 hPa

Test Voltage : DC 3.7V

Test Mode: Mode 4

Relative Humidity: 54%

Polarization : Horizontal

[Graph: Radiated Emission test results (30MHz-1GHz) for Horizontal polarization, showing measured levels against frequency from 30.000 MHz to 1000.000 MHz, with FCC Class B 3M Radiated limits indicated.]

Remark: Correct Factor = Cable loss + Antenna factor – Preamplifier; Level = Reading Level + Correct Factor; Margin = Level - Limit;

Temperature: 26°C

Pressure: 1010 hPa

Test Voltage: DC 3.7V

Test Mode : Mode 4

Relative Humidity: 54%

Polarization : Vertical

[Graph: Radiated Emission test results (30MHz-1GHz) for Vertical polarization, showing measured levels against frequency from 30.000 MHz to 1000.000 MHz, with FCC Class B 3M Radiated limits indicated.]

Remark: Correct Factor = Cable loss + Antenna factor – Preamplifier; Level = Reading Level + Correct Factor; Margin = Level - Limit;

3.2.8 TEST RESULTS (1GHZ~25GHZ)

GFSK

operation frequency:2402

operation frequency:2440

operation frequency:2480

Remark: 1. Emission Level = Meter Reading + Antenna Factor + Cable Loss – Pre-amplifier, Margin= Emission Level - Limit 2. If peak below the average limit, the average emission was no test. 3. The amplitude of spurious emissions which are attenuated by more than 20dB below the permissible value has no need to be reported.

3.3 RADIATED BAND EMISSION MEASUREMENT

3.3.1 TEST REQUIREMENT:

FCC Part15 C Section 15.209 and 15.205

LIMITS OF RADIATED EMISSION MEASUREMENT (Above 1000MHz)

Notes: (1) The limit for radiated test was performed according to FCC PART 15C. (2) The tighter limit applies at the band edges. (3) Emission level (dBuV/m)=20log Emission level (uV/m).

Spectrum Parameter

3.3.2 TEST PROCEDURE

Above 1GHz test procedure as below:

a. 1. The EUT was placed on the top of a rotating table 1.5 meters above the ground at a 3 meter camber. The table was rotated 360 degrees to determine the position of the highest radiation.

b. The EUT was set 3 meters away from the interference-receiving antenna, which was mounted on the top of a variable-height antenna tower.

c. The antenna height is varied from one meter to four meters above the ground to determine the maximum value of the field strength. Both horizontal and vertical polarizations of the antenna are set to make the measurement.

d. For each suspected emission, the EUT was arranged to its worst case and then the antenna was tuned to heights from 1 meter to 4 meters and the rota table was turned from 0 degrees to 360 degrees to find the maximum reading.

e. The test-receiver system was set to Peak Detect Function and Specified Bandwidth with Maximum Hold Mode.

f. If the emission level of the EUT in peak mode was 10dB lower than the limit specified, then testing could be stopped and the peak values of the EUT would be reported. Otherwise the emissions that did not have 10dB margin would be re-tested one by one using peak, quasi-peak or average method as specified and then reported in a data sheet.

g. Test the EUT in the lowest channel, the Highest channel

Note: Both horizontal and vertical antenna polarities were tested and performed pretest to three orthogonal axis. The worst case emissions were reported

3.3.3 DEVIATION FROM TEST STANDARD

No deviation

3.3.4 TEST SETUP

[Diagram: An aechoic 3m chamber setup for radiated emission testing above 1GHz. It shows an EUT on a turn table 1.5m above the ground, with antenna elevation varying from 1 to 4m. The distance to the antenna is 3m. Absorbers are present. PC System, Spectrum Analyzer, AMP, and Combining Network are connected.]

3.3.5 EUT OPERATING CONDITIONS

The EUT tested system was configured as the statements of 2.3 Unless otherwise a special operating condition is specified in the follows during the testing.

3.3.6 TEST RESULT

GFSK

operation frequency:2402

operation frequency:2480

Remark: 1. Emission Level = Meter Reading + Antenna Factor + Cable Loss – Pre-amplifier, Margin= Emission Level - Limit 2. If peak below the average limit, the average emission was no test. 3. The amplitude of spurious emissions which are attenuated by more than 20dB below the permissible value has no need to be reported.

4. BANDWIDTH TEST

4.1 APPLIED PROCEDURES / LIMIT

FCC Part15 (15.215), Subpart C

4.1.1 TEST PROCEDURE

1. Set RBW = 30 kHz.
2. Set the video bandwidth (VBW) ≥RBW.
3. Detector = Peak.
4. Trace mode = max hold.
5. Sweep = auto couple.
6. Allow the trace to stabilize.
7. Measure the maximum width of the emission that is constrained by the frequencies associated with the two outermost amplitude points (upper and lower frequencies) that are attenuated by 20 dB relative to the maximum level measured in the fundamental emission.

4.1.2 DEVIATION FROM STANDARD

No deviation.

4.1.3 TEST SETUP

[Diagram: A simple test setup showing 'EUT' connected to a 'SPECTRUM ANALYZER'.]

4.1.4 EUT OPERATION CONDITIONS

The EUT tested system was configured as the statements of 2.3 Unless otherwise a special operating condition is specified in the follows during the testing.

4.1.5 TEST RESULTS

Temperature: 25 °C

Pressure: 1012 hPa

Test Mode : TX Mode /CH00, CH19, CH39

Relative Humidity: 60%

Test Voltage: DC 3.7V

GFSK

[Image Description: Three spectrum analyzer screenshots showing the occupied bandwidth and 20dB bandwidth measurements for GFSK modulation at 2402MHz, 2440MHz, and 2480MHz. Each screenshot displays the center frequency, resolution bandwidth, video bandwidth, span, trace, and measured bandwidth.]

5. ANTENNA REQUIREMENT

5.1 STANDARD REQUIREMENT

15.203 requirement: For intentional device, according to 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.

5.2 EUT ANTENNA

The EUT antenna is PCB antenna, It comply with the standard requirement.

6. TEST SETUP PHOTO

Radiated Measurement Photos

[Photo: A view of the radiated emission test setup in a semi-anechoic chamber, showing the EUT on a turntable, receiving antenna, and test equipment.]

[Photo: Another view of the radiated emission test setup in a semi-anechoic chamber, showing the EUT from a different angle.]

Conducted Measurement Photos

[Photo: A view of the conducted emission test setup, showing the EUT, LISN, and test equipment on a table.]

7. EUT PHOTO

[Photo: Top view of the MACHENIKE K500-B61 keyboard, with a ruler for scale, showing the key layout and design.]

[Photo: Another view of the MACHENIKE K500-B61 keyboard, with a ruler for scale, showing the keyboard from a different angle.]

[Photo: Underside view of the MACHENIKE K500-B61 keyboard, with a ruler for scale, showing the casing and any labels.]

[Photo: Internal view of the MACHENIKE K500-B61 keyboard, showing the PCB and battery, with a ruler for scale.]

[Photo: Close-up view of the MACHENIKE K500-B61 keyboard PCB, with a ruler for scale, showing electronic components.]

[Photo: Close-up view of the MACHENIKE K500-B61 keyboard battery, with a ruler for scale, showing specifications.]