PCTEST Engineering Laboratory, Inc. Measurement Report

Applicant Information

Applicant Name: Apple Inc.

Address: One Apple Park Way, Cupertino, CA 95014, United States

Testing Details

Date of Testing: 05/01/2019 - 08/09/2019

Test Site/Location: PCTEST Lab. Morgan Hill, CA, USA

Test Report Serial No.: 1C1905130011-09.BCG

Device Identification & Specifications

FCC ID: BCG-A2157

IC: 579C-A2157

APPLICANT: Apple Inc.

Application Type: Certification

Model/HVIN: A2157

EUT Type: Watch

Frequency: 13.56MHz

FCC Classification: Low Power Communications Device Transmitter (DXX)

FCC Rule Part(s): Part 15 Subpart C (15.225)

ISED Specification: RSS-210 Issue 9

Test Procedure(s): ANSI C63.10-2013

Attestation

This equipment has been shown to be capable of compliance with the applicable technical standards as indicated in the measurement report and was tested in accordance with the measurement procedures specified in ANSI C63.10-2013. Test results reported herein relate only to the item(s) tested.

I attest to the accuracy of data. All measurements reported herein were performed by me or were made under my supervision and are correct to the best of my knowledge and belief. I assume full responsibility for the completeness of these measurements and vouch for the qualifications of all persons taking them.

Signed: Randy Ortanez

Title: President

1.0 Introduction

1.1 Scope

Measurement and determination of electromagnetic emissions (EMC) of radio frequency devices including intentional and/or unintentional radiators for compliance with the technical rules and regulations of the Federal Communications Commission and the Innovation, Science and Economic Development Canada.

1.2 PCTEST Test Location

These measurement tests were conducted at the PCTEST Engineering Laboratory, Inc. facility located at 18855 Adams Court, Morgan Hill, CA 95037. The measurement facility is compliant with the test site requirements specified in ANSI C63.4-2014 and KDB 414788 D01 v01r01.

1.3 Test Facility / Accreditations

Measurements were performed at PCTEST Engineering Lab located in Morgan Hill, CA 95037, U.S.A.

• PCTEST is an ISO 17025-2005 accredited test facility under the American Association for Laboratory Accreditation (A2LA) with Certificate number 2041.02 for Specific Absorption Rate (SAR), Hearing Aid Compatibility (HAC) testing, where applicable, and Electromagnetic Compatibility (EMC) testing for FCC and Innovation, Science, and Economic Development Canada rules.
• PCTEST TCB is a Telecommunication Certification Body (TCB) accredited to ISO/IEC 17065-2012 by A2LA (Certificate number 2041.03) in all scopes of FCC Rules and ISED Standards (RSS).
• PCTEST facility is a registered (22831) test laboratory with the site description on file with ISED.

2.0 Product Information

2.1 Equipment Description

The Equipment Under Test (EUT) is the Apple Watch FCC ID: BCG-A2157. The test data contained in this report pertains only to the emissions due to the NFC transmitter of the EUT.

Test Device Serial No.: D92YF005M95Y, D92YF00PM8CJ

2.2 Device Capabilities

This device contains the following capabilities: 850/1700/1900 WCDMA/HSPA, Multi-band LTE, 802.11b/g/n WLAN, Bluetooth (1x, EDR, HDR4, HDR8, LE), NFC.

Note: The device supports different modes, types, and data rates of NFC signal.

2.3 Test Support Equipment

2.4 Test Configuration

The EUT was tested per the guidance of ANSI C63.10-2013 for radiated spurious emissions and AC line conducted testing. The worst-case configuration was investigated for various materials, wristbands, and with/without a wireless charger. The EUT was manipulated through three orthogonal planes (X, Y, Z) to determine the worst-case emissions. Testing below 1GHz used the highest transmitting modulation and worst-case configuration. For AC line conducted and radiated tests below 1GHz, configurations included EUT powered by AC/DC adapter via USB cable with wireless charger, and EUT powered by host PC via USB cable with wireless charger.

2.5 Software and Firmware

The test was conducted with firmware version wOS 6.0 installed on the EUT.

2.6 EMI Suppression Device(s)/Modifications

No EMI suppression device(s) were added and no modifications were made during testing.

3.0 Description of Test

3.1 Evaluation Procedure

The measurement procedure described in the American National Standard of Procedures for Compliance Testing of Unlicensed Wireless Devices (ANSI C63.10-2013) was used.

Deviation from measurement procedure: None

3.2 AC Line Conducted Emissions

The line-conducted facility is a 7m x 3.66m x 2.7m shielded enclosure. It complies with MIL-Std-285 or NSA 65-6. A 1m x 1.5m wooden table (80cm high) is placed 40cm from the vertical wall and 80cm from the sidewall. Two 10kHz-30MHz, 50Ω/50μH Line-Impedance Stabilization Networks (LISNs) are bonded to the floor. External high-current, high-insertion loss power line filters (EPCOS 2X60A and 2X48A) are used to attenuate ambient noise. The EUT is powered from one LISN, and support equipment from the second. Interconnecting cables over 1 meter were shortened to 1 meter and bundled. Cables were at least 40cm above the groundplane. The test setup was allowed to warm up. Exploratory measurements determined peak emissions. The spectrum was scanned from 150kHz to 30MHz using a spectrum analyzer with a peak detector and 10kHz bandwidth. The EUT, support equipment, and cables were arranged to maximize emissions. Final measurements used CISPR quasi-peak and average detectors with a 9kHz resolution bandwidth. Automated test software (Rohde & Schwarz EMC32, Version 10.35.1) was used.

3.3 Radiated Emissions

Radiated tests were performed in a 3-meter semi-anechoic chamber. The chamber is shielded from ambient interference and has a 6m x 5.2m obstruction-free area compliant with ANSI C63.4-2014. Absorbers are used to minimize reflections above 1GHz. A Styrodur table (80cm high) is used, with an additional pedestal for measurements above 1GHz to reach a total table height of 1.5m. For emissions below 30MHz, a calibrated loop antenna was used. Test site equivalency for below 30MHz was verified. For measurements above 30MHz, broadband antennas were used up to the upper frequency limit. For frequencies above 1GHz, linearly polarized double ridge horn antennas were used. Exploratory measurements were made at 1-meter distance to identify peak emissions. Sufficient warm-up time was allowed. The test setup was placed on a 1 x 1.5 meter table. The EUT, support equipment, and cables were arranged to maximize emissions. Final measurements used calibrated, linearly polarized broadband and horn antennas. The turntable was rotated 360 degrees, and the receive antenna height was varied from 1 to 4 meters to find the maximum emission. The EUT orientation and antenna polarity were adjusted to maximize emissions.

3.4 Environmental Conditions

Temperature was controlled between 15°C and 35°C. Relative humidity was controlled between 10% and 75%. Atmospheric pressure was monitored between 86-106kPa (860-1060mbar).

4.0 Antenna Requirements

As per FCC §15.203, an intentional radiator antenna must be designed to ensure only the furnished antenna can be used. A permanently attached antenna or one with a unique coupling is sufficient.

• The antenna of the EUT is permanently attached.
• This unit was tested with its standard battery.

Conclusion: The EUT complies with the requirement of §15.203.

5.0 Measurement Uncertainty

Measurement uncertainties were calculated per ANSI C63.10-2013, with a coverage factor of k=2 for 95% confidence. These values meet or exceed CISPR 16-4-2 specifications.

6.0 Test Equipment Calibration Data

Test equipment calibration is traceable to NIST. Antennas were calibrated per ANSI C63.5-2017.

Note: Equipment calibration dates were within the test date range.

7.0 Test Data

7.1 Summary

Company Name: Apple Inc.

FCC ID: BCG-A2157

FCC Classification: Low Power Communications Device Transmitter (DXX)

Frequencies Examined: 13.56MHz

Note: This unit was tested with its standard battery.

7.2 20dB Bandwidth Measurement

§2.1049; RSS-Gen (6.7)

Test Overview and Limit: The bandwidth at 20dB down from the highest in-band spectral density is measured with a spectrum analyzer connected to the receive antenna while the EUT is operating in transmission mode at the appropriate frequency.

Test Procedure Used: ANSI C63.10-2013 – Section 6.9.2

Test Settings:

• Spectrum analyzer's automatic bandwidth measurement capability was used. "X" dB bandwidth parameter set to X = 20.
• RBW = 1-5% OBW
• VBW ≥ 3 x RBW
• Reference level set to keep signal from exceeding maximum input mixer level for linear operation.
• Detector = Peak
• Trace mode = max hold
• Sweep = auto couple
• Trace was allowed to stabilize.

Test Setup: The EUT and measurement equipment were set up as shown in the diagram below.

Diagram Description: Figure 7-1 shows the test setup with the EUT connected to a Spectrum Analyzer via an antenna.

Test Notes: All possible configurations were investigated and only the worst case is reported.

Plot Description: Plots 7-1 through 7-5 show the 20dB bandwidth measurements for various configurations (CE A 848kbps, CE B 848kbps, CE F 424kbps, Reader 10% Ask 1 out of 4, Reader 10% Ask 1 out of 256).

7.3 Frequency Stability Test Data

§15.225; RSS-210 (B.6)

Test Overview and Limit: Frequency stability testing measures the transmitter's frequency stability under varying temperature and voltage conditions. The limit for Part 15.225 is ±0.01% of the center frequency.

Test Procedure Used: ANSI C63.10-2013 – Section 6.8

Test Settings:

• Carrier frequency measured at room temperature (20°C) as a reference.
• Equipment powered on for 15 minutes before measurement.
• Measurements taken within one minute after applying power.
• Frequency measurements made at 10°C intervals from -20°C to +50°C, with at least 30 minutes stabilization time at each temperature.

Test Setup: The EUT and measurement equipment were set up within an environmental chamber, connected to a spectrum analyzer.

Diagram Description: The setup involves an EUT inside a Temperature Chamber connected to an Agilent Spectrum Analyzer.

Test Notes: All possible configurations were investigated and only the worst case is reported.

Plot Description: Figure 7-2 shows the Frequency Stability Plot for CE A 848kbps.

Plot Description: Figure 7-3 shows the Frequency Stability Plot for Reader 10% Ask 1 out of 256.

7.4 In-Band Radiated Spurious Emission Measurements

§15.225(a)(b)(c); RSS-210 (B.6)

Test Overview and Limit: The EUT was tested from 13.110 – 14.010 MHz. In-band radiated spurious emissions were measured using a spectrum analyzer connected to a loop antenna. Emissions in restricted bands must not exceed specified limits.

Test Procedures Used: ANSI C63.10-2013 – Section 6.4.7

Test Settings: RBW = 9kHz, VBW ≥ 3 x RBW, Detector = peak, Sweep time = auto couple, Trace mode = max hold.

Diagram Description: Figure 7-4 illustrates the radiated test setup with the EUT on a turntable and an antenna mast.

Test Notes: Emissions in restricted bands are below the limits. Measurements were performed using a loop antenna in three orthogonal positions. Emissions were greater than 20 dB below the limit. The EUT was positioned in three orthogonal planes. Data was extrapolated to 30m. Spectrum investigated from 9kHz to 30MHz using the loop antenna. Only significant emissions are reported. Measurements used a peak detector. "-" denotes noise floor. All configurations were investigated.

Plot Description: Plots 7-6 and 7-7 show In-Band Radiated Spurious Plots for CE A 848kbps and Reader 10% Ask 1 out of 256, respectively.

7.5 Radiated Spurious Emission Measurements, Out-of-Band

§15.209 §15.225(d); RSS-Gen (8.9)

Test Overview and Limit: The EUT was tested from 9kHz up to 1GHz, excluding the 13.110 – 14.010 MHz band. Measurements used a spectrum analyzer with a peak detector (quasi-peak for below 960MHz). Out-of-band emissions in restricted bands must not exceed limits per Section 15.209.

Test Procedures Used: ANSI C63.10-2013 – Section 6.5.4

Test Settings: Analyzer center frequency set to emission of interest. RBW = 9kHz (below 30MHz) or 100kHz (30MHz-1GHz). VBW ≥ 3 x RBW. Detector = peak. Sweep time = auto couple. Trace mode = max hold.

Diagram Description: Figures 7-5 and 7-6 show the radiated test setups for frequencies below and above 30MHz, respectively.

Plot Description: Plots 7-8 and 7-9 show Radiated Spurious Plots 9kHz – 30MHz for CE A 848kbps and Reader 10% Ask 1 out of 256. Plots 7-10 and 7-11 show Radiated Spurious Plots 30MHz – 1GHz for CE A 848kbps and Reader 10% Ask 1 out of 256, respectively.

7.6 AC Line Conducted Measurement Data

§15.207; RSS-Gen (8.8)

Test Overview and Limit: AC line conducted emissions were measured using a receiver connected to a grounded LISN while the EUT operated at maximum duty cycle and power. All data rates and modes were investigated. Conducted emissions must not exceed the limits in Table 7-11.

*Decreases with the logarithm of the frequency.

Test Procedures Used: ANSI C63.10-2013, Section 6.2

Test Settings:

• Quasi-Peak Field Strength Measurements: Analyzer center frequency set to emission of interest. RBW = 9kHz. Detector = quasi-peak. Sweep time = auto couple. Trace mode = max hold.
• Average Field Strength Measurements: Analyzer center frequency set to emission of interest. RBW = 9kHz. Detector = RMS. Sweep time = auto couple. Trace mode = max hold.

Diagram Description: Figure 7-7 illustrates the test instrument and measurement setup for AC line conducted emissions, showing the EUT, LISN, and reference ground plane.

Plot Description: Plots 7-12 and 7-13 show Line-Conducted Test Plots for L1 (with WCP + AC/DC Adapter) and N (with WCP + AC/DC Adapter), respectively. Tables 7-12 and 7-13 provide the corresponding test data.

8.0 Conclusion

The data collected relate only to the item(s) tested and show that the Apple Watch FCC ID: BCG-A2157 has been tested to show compliance with Part 15 Subpart C (15.225) of the FCC Rules and RSS-210 of the Innovation, Science and Economic Development Canada Rules.