The basic requirements for keyboard inspection include appearance and structural inspection, character wear resistance testing, connection testing, etc.
Computer keyboard inspection, appearance and structural inspection
By visual inspection and touch method, the keyboard surface should not have obvious dents, scratches, cracks, deformations, dirt, etc.
The surface coating should be uniform, without bubbles, cracks, peeling, or wear. Metal components should not have rust or other mechanical damage.
The components of the keyboard should be securely fastened without any looseness, and the key switches should be flexible and reliable.
The characters on the keyboard should have vivid and clear tones.
The keyboard layout should comply with the relevant standards.
The number of keycaps on the keyboard should be specified in the product standard.
Computer keyboard inspection character wear resistance test
Test conditions:
a) Material: 1107 eraser;
b) Frequency: 1 time/s (one round trip equals one time);
c) Pressure: 10 N.
The keyboard should be tested under the above conditions, and the characters on the keycaps should be wiped 250 times, with intact and no discoloration.
Computer keyboard inspection and connection testing
Connect a host or validated simulator that is compatible with the tested keyboard interface to the tested keyboard, and send an interface verification program from the host (or simulator) to verify the correctness of the status of each signal line on the interface.
Main performance tests for computer keyboard inspection
Button lifespan test
Condition:
a) Power up;
b) Frequency: not less than 4 times/s;
c) Pressure: Maximum value of key pressure.
The keyboard should have a lifespan of no less than 1 × 10 ⁷ times when tested under the above conditions.
Key pressure test
Measure the pressure on the keycap with a pressure gauge with an accuracy of not less than 0.01N. The key pressure is 0.54N ± 0.14N. The pressure of keys for special functions and keys for keyboards used for special purposes should be specified in the product standards.
Button Pulling Force Test
Measure the force required for the keycap to be pulled out vertically using a tension gauge with an accuracy of not less than 0.1N. The pulling force of key caps should not be less than 12 N. The pulling force of key caps for special functions and special use keyboards should be specified in the product standards.
Contact resistance test
Measure the longest two ends of the button information path with a multimeter, and the contact resistance should not exceed 1k Ω.
Shake time test
The time required for the circuit contact to stabilize from the moment the keyboard keys are pressed. Observe and measure the total time required for the voltage level on the contact circuit to transition from the end of one steady state to the beginning of the next adjacent steady state using an oscilloscope. The shaking time of the button should not exceed 15ms.
Power adaptability test
Adjust the DC power supply voltage to deviate from the nominal value by+5%, and check the keyboard performance. The test sample should work normally. The product should be able to operate normally under the condition of ± 5% change in the nominal value of the DC voltage. The nominal value of DC voltage should be specified in the product standard. Units with special requirements for power supply should be specified in the product standards.
Requirements for adaptability of computer keyboard environment
Climate and environmental adaptability
Mechanical environmental adaptability
Vibration adaptability
Impact adaptability
Collision adaptability
Adaptability to falls of transportation packaging
Post time: Dec-09-2024