Mobile Phone Reliability Experiment Catalog:
1. Purpose
2. Basis for Preparation
3. Implementation Principles
4. Scope of Application
5. Terms and Definitions
6. Main Responsibilities
7. Reliability Test Procedure
7.1. Accelerated Life Test (ALT)
7.2. Climate Adaptability Test
7.3. Mechanical Endurance Test
7.4. Decorative Surface Test
7.5. Special Stress Test
7.6. Other Environmental Tests
8. Final Inspection
9. Appendix:
1. Purpose
As part of the product quality assurance system, the reliability testing program aims to achieve several key objectives. First, it seeks to continuously evaluate the life and fatigue resistance of the product under specific environmental conditions to assess its overall quality and reliability. Second, it establishes standardized procedures for conducting Product Reliability Tests (PRT) to ensure consistency and accuracy in evaluation.
2. Basis for Preparation
This testing protocol is based on a range of national and industry standards, including but not limited to GB/T 2421-1999, GB/T 15844.2-1995, GB/T 2423.1-2001, GB/T 17626.2-1998, and YD/T 1215-2002. These standards provide the foundation for designing and executing various types of reliability tests that simulate real-world conditions mobile phones may face.
3. Implementation Principles
The reliability test procedure must be strictly followed, with clear judgment criteria and execution guidelines. All tests should be conducted in accordance with the defined protocols to ensure accurate and repeatable results.
4. Scope of Application
This reliability testing protocol applies to all R&D mobile phone products developed by XXXXX Wireless Communication Company. It ensures that each new product meets the required performance and durability standards before mass production.
5. Terms and Definitions
PRT: Product Reliability Test – A systematic process used to evaluate the long-term performance and stability of a product under various stress conditions.
6. Main Responsibilities
6.1. Reliability Test Technician: Responsible for executing and tracking specific test tasks, recording data, maintaining equipment, and managing laboratory databases.
6.2. Reliability Test Engineer: Develops and oversees reliability test plans, analyzes test results, and collaborates on improving product design and performance.
6.3. Reliability Test Manager: Oversees the implementation of test procedures, reviews project plans, and coordinates with other departments to ensure compliance with quality standards.
6.4. Reliability Test Specialist: Assists in interpreting test requirements, monitors progress, and communicates with designers and testers to resolve issues promptly.
7. Reliability Test Procedure
7.1. Accelerated Life Test (ALT)
Prototype quantity: PR1: 8, PR2: 10, PR3: 10, PIR: 10. Test duration: 10–12 days. Purpose: To accelerate product failures through continuous application of multiple stress conditions, identifying potential defects early in the development cycle.
Test procedure: The sequence includes thermal shock, drop tests, temperature/humidity exposure, and functional checks. Each test requires surface, structural, and functional inspections following established inspection standards.
Standard test: 7.1.1 Parametric Test at Room Temperature – Conducted at 20–25°C using a 8960/8922 tester to verify baseline performance parameters. Test standard: All parameters must be normal and function correctly.
7.1.2 Thermal Shock Test – Conducted between -30°C and +70°C, with 27 cycles. After recovery, visual and functional checks are performed. Test standard: No visible damage, proper function, and no structural deformation.
7.1.3 Drop Test – Performed from 1.5 m height onto a marble floor. For PDAs, the height can be adjusted as per company recommendations. Test standard: No damage or functional issues after dropping.
7.1.4 Vibration Test – Conducted at frequencies ranging from 10–55 Hz. After vibration, memory and settings must remain intact, and no noise or functional issues should occur.
7.1.5 Humidity Test – Conducted at 60°C and 95% RH for 60 hours. Post-test checks include visual, structural, and functional assessments. Test standard: No damage or malfunction observed.
7.1.6 Electrostatic Discharge (ESD) Test – Conducted at +/- 4kV to +/- 8kV. The phone must maintain normal operation during and after discharge. Any failure at these levels is considered a fault.
7.2. Climate Adaptability Test
Sample size: 4 for general weather, 2 for severe weather. Total: 8 units. Duration: 7 days. Purpose: Simulate real-world climatic conditions to evaluate product performance and durability.
General weather tests include high/low temperature parameter testing, high humidity testing, and functional testing. Severe weather tests involve dust, salt fog, and other extreme conditions. Test standards require no functional degradation, structural deformation, or electrical issues.
7.3. Mechanical Endurance Test
Sample size: 11 units. Duration: 7 days. Includes tests such as keypad life, side key life, flip life, slide life, repeated drop tests, charger plug life, stylus life, touch screen click life, line life, battery cover life, SIM card life, headset life, and cable endurance tests.
Each test has specific cycles and inspection intervals. For example, the keypad test involves 100,000 presses, with checks at 30K, 50K, 80K, and 100K. Standard: All components must function properly without damage or wear.
7.4. Decorative Surface Test
Duration: 4 days. Sample size: 6 units per color. Includes abrasion, coating adhesion, perspiration, hardness, lens scratch, and UV resistance tests. Standards include no peeling, cracking, or discoloration after exposure to various conditions.
7.5. Special Stress Test
Includes low-temperature drop, twist, squeeze, and ball drop tests. Each test simulates extreme conditions. For example, the low-temperature drop test involves dropping the phone from 1.2 meters after cooling to -10°C. Standard: No damage, deformation, or functional issues.
7.6. Other Environmental Tests
Sample size: 5 units. Duration: 1 day. Includes screw disassembly tests, lanyard hole strength tests, and others. Standards ensure components remain secure and functional under stress.
8. Final Inspection
The final inspection is more than just a visual and functional check. It includes internal inspection for cracks, loose parts, contamination, and assembly issues. All prototypes must be disassembled and inspected thoroughly to identify any hidden defects that could lead to failure.
8.1. After completing the ALT, all prototypes must be disassembled for inspection.
8.2. Structural tests like keypad, side key, micro-drop, charger connector, flip/slide, and headset tests also require disassembly for detailed inspection.
8.3. Special condition tests and vibration tests must also be disassembled to ensure internal integrity. Inspections should be conducted in a clean environment to avoid missing small components or plastic fragments inside the device.
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