Engineering Test Plan Creator

Engineering Test Plan: Wireless Earbuds

1. Objectives and Scope

The objective of this test plan is to comprehensively evaluate the performance, reliability, safety, and compliance of the wireless earbud product prior to market release. The scope includes testing audio quality, Bluetooth connectivity, battery life, water resistance, fit and comfort, as well as regulatory certifications.

2. Performance and Quality Standards

The wireless earbuds must meet the following standards: - Audio Quality: Frequency response 20Hz-20kHz, THD < 0.1%, SNR > 90dB - Bluetooth: v5.0, range > 10m, pairing time < 5s, stable connection - Battery Life: > 5 hours playtime, > 20 hours with case, charging time < 2 hours
- Water Resistance: IPX4 rating or higher - Fit and Comfort: Secure fit, no discomfort after 2 hours of wear

3. Test Cases

3.1 Audio Quality

• Frequency response and THD measurement with audio analyzer
• Subjective listening tests in quiet and noisy environments
• Driver matching and stereo imaging evaluation

3.2 Bluetooth Connectivity

• Pairing time, range, and stability testing in various environments
• Interference testing with other wireless devices
• Multipoint connectivity and switching evaluation

3.3 Battery Life

• Continuous playback runtime test at 50% volume
• Charging case capacity and earbuds charge time measurement
  
• Battery health evaluation after 300 charge cycles

3.4 Water Resistance

• IPX4 water splash test from all angles
• Functionality check after water exposure
• Extended sweat and moisture exposure test

3.5 Fit and Comfort

• Subjective fit and comfort assessment with diverse panel of users
  
• Accelerated wear testing to simulate long-term use
• Eartip durability and attachment strength test

3.6 Regulatory Certification

• FCC Part 15 wireless and EMC testing
• CE marking evaluation for Europe
• RoHS and REACH compliance validation

4. Test Equipment and Environments

• Audio analyzer and measurement microphone
• Bluetooth sniffer and RF shielded enclosure
• Battery cycler and charging station
• IPX4 water splash tester
• Environmental chambers for temperature and humidity
• Automated life-cycle tester for buttons and connectors
• Accredited regulatory certification lab

5. Acceptance Criteria

• All test cases must pass defined criteria for product release
• Any failures must be investigated and retested after corrective action
• Regulatory certifications must be obtained prior to market launch

6. Test Schedule

6.1 Milestones

1. Test plan approval: Week 1
2. Test equipment and resources allocated: Week 2
3. Audio quality and Bluetooth testing completed: Week 6
4. Battery life and water resistance testing completed: Week 8
   
5. Fit, comfort and regulatory testing completed: Week 10
6. Test report review and product release decision: Week 12

6.2 Dependencies

• Availability of pre-production samples for testing
• Timely completion of each test phase to meet overall schedule
• Early engagement of certification lab to meet regulatory timelines

7. Risks and Contingencies

• Delays in pre-production samples may compress test schedule
• Failures found in testing may require design changes and re-test
• Regulatory certification issues may delay product launch

Contingency plans: - Prioritize testing if schedule is compressed, accept additional business risk - Plan for 1-2 rounds of design tweaks and re-test in schedule - Proactively engage regulatory labs and address any pre-scan issues