Inspection | Computer Keyboard Inspection Standards and Methods

Computer keyboard inspection technical specifications

1. Appearance and structure inspection

1. Surface quality (visual inspection + touch method)

   • The shell should be free of dents, scratches, cracks, deformation and dirt;

   • The coating is uniform without blistering, cracking, falling off or wear;

   • Metal parts are free of rust and mechanical damage.

2. Assembly quality

   • Parts are tightened and not loose;

   • The key switch is flexible and reliable;

   • The keycap characters are clear and distinct without any blur or fading.

3. Layout and specifications

   • The keyboard layout complies with national standards (such as GB/T 14081);

   • The number of keycaps must be clearly stated in the product standard.

2. Character wear resistance test

1. Test conditions

   • Materials: 1107 eraser;

   • Frequency: 1 time/second (1 time for one way);

   • Pressure: 10N.

2. Eligibility criteria

   • After 250 wipes, the keycap characters:

     • The characters are complete and without any defects;

     • No fading or discoloration of colors.

3. Connection interface test

1. Test Method

   • Connect to the host or a verified simulator;

   • Run the interface test program to detect the status of each signal line.

2. Eligibility criteria

   • All signal lines are functioning normally, with no communication errors.

4. Core Performance Test

1. Key life test

   • condition :

     • Keyboard power status;

     • Trigger frequency ≥ 4 times/second;

     • Pressure = the maximum value a button can withstand.

   • Standard : Single key life ≥ 10 million times .

2. Key pressure test

   • Tools : pressure gauge with accuracy ≥ 0.01N;

   • standard :

     • Normal key pressure: 0.54N±0.14N ;

     • Special function keys are implemented according to product standards.

3. Keycap pull-out force test

   • Tools : dynamometer with an accuracy of ≥0.1N;

   • standard :

     • Conventional keycap pull-out force ≥ 12N ;

     • Special keycaps are implemented according to product standards.

4. Contact resistance test

   • Tools : Multimeter;

   • Method : Measure the longest two ends of the key path;

   • Standard : Resistance value ≤ 1kΩ .

5. Jitter time test

   • Tools : Oscilloscope;

   • Method : Record the total time it takes for the contact level to change from a steady state to the next steady state;

   • Standard : Jitter time ≤ 15ms .

5. Power adaptability test

1. Test Method

   • Adjust the DC power supply voltage to ±5% of the nominal value (e.g., if the nominal value is 5V, the test range is 4.75V–5.25V);

   • Check that the keyboard is functioning properly.

2. Eligibility criteria

   • When the voltage fluctuation is within the range of ±5%, all keyboard functions are normal without any abnormalities.

   Note: Special power requirements must be stated in the product standards.

6. Packaging and labeling requirements

1. Product Labeling:

   • Implementation standard number (e.g. GB/T 14081);

   • Model specifications, production date/batch;

   • Manufacturer information and power supply nominal values.

2. The outer packaging must include:

   • Waterproof and shockproof logo;

   • Description of the interface type (such as USB/PS2).

We provide professional third-party inspection and factory inspection services to ensure that the final tableware and kitchenware products delivered comply with standards, regulations and target market requirements, avoid disputes due to product quality issues, and improve supply chain management and quality control measures.