Precision and Quality Test Results • Measuring Equipment
Measuring equipment resolution • Distance 0.01 mm • Gram force 0.2 gF • Noise dBA 0.1 • Measured keyboard keys: 2 7 = \ B /
Image and Graph Differences
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Image above shows values of average line, which is combination of 6 lines ( 2 7 = \ B / ). Table in graph shows values of 6 separated lines (gram force values before actuation). MX KEYS MED gram force value in table is calculated from MAX values of 6 separated lines:
60.4 + 57.6 + 58.4 + 65.8 + 55.2 + 62.2) / 6 = 59.9
MAX number 59.7 of average line in image is lower than MED number in table (average of 6 MAX values), because MAX peak of average line is not at the highest points of all 6 separated lines (they are at slightly different positions).
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Actuation and Travel Distances
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Actuation distance (mm): how far you need to push keyboard key for value to change. Good scissor switch keyboards have 1-1.2 mm actuation distance.
Travel distance (mm): how far you need to push keyboard key to reach the end = 150 gF.
Deviation (±mm): deviation from average. No deviation (0) would be perfect.
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ACTUATION Distance (mm) (±mm) • Actuation: 0+ 1.50+ 2.00+ • Travel: 0+ 3.00+ 4.00+ |
KEYBOARDS |
Actuation |
Travel |
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1. Logitech MX KEYS |
1.35 0.03 |
2.08 0.08 |
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2. Logitech K800 |
2.18 0.04 |
3.21 0.03 |
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3. Cherry STREAM |
1.80 0.02 |
2.75 0.02 |
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4. Dell KB216 |
1.84 0.02 |
2.55 0.03 |
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5. Logitech MK270 |
2.42 0.06 |
3.66 0.04 |
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6. Logitech MK295 |
2.84 0.05 |
3.30 0.06 |
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7. Logitech G513 |
1.33 0.13 |
3.32 0.02 |
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8. Corsair K70 |
1.91 0.06 |
3.99 0.02 |
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Actuation Gram Force
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Max pre-actuation gram force (gF): max gram force before actuation. About 45-50 gF is required to hold natural weight of fingers. Overcoming max pre-actuation gF (as tactile bump) ensures enough force not to skip a character, if actuation gF is smaller significantly.
Actuation gram force (gF): gram force at the moment of actuation.
Deviation (±gF): deviation from average. No deviation (0) would be perfect.
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ACTUATION Gram Force (gF) (±gF) • 0+ 50.0+ 60.0+ |
KEYBOARDS |
Max Pre-Actuation |
Actuation |
Difference |
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1. Logitech MX KEYS |
61.5 1.33 |
33.3 0.87 |
28.2 |
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2. Logitech K800 |
63.9 1.91 |
30.7 2.43 |
33.2 |
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3. Cherry STREAM |
63.7 1.64 |
30.3 0.78 |
33.4 |
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4. Dell KB216 |
59.0 1.02 |
39.4 0.73 |
19.6 |
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5. Logitech MK270 |
53.9 2.00 |
39.0 2.46 |
14.9 |
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6. Logitech MK295 |
56.6 1.58 |
51.6 3.43 |
4.9 |
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7. Logitech G513 |
45.7 1.93 |
45.7 1.93 |
0 |
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8. Corsair K70 |
51.5 0.57 |
39.7 1.11 |
11.8 |
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Noise • Sound Pressure Level
Sound pressure level (dBA): tested by dropping 60g "finger" (with Shore A 22 hardness silicone bumper at the end) 40 times on 2 7 = \ B / keyboard keys from 1 mm height. Sound pressure level recorded from 1 m distance. To avoid negative effects on sleep, sound pressure level should not exceed 30 dBA (Nigh Noise Guidelines for Europe by World Health Organization).
Deviation (±dBA): deviation from average. No deviation (0) would be perfect.
NOISE • Sound Pressure Level (dBA) (±dBA) • 0+ 30.0+ 40.0+ |
KEYBOARDS |
Noise |
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1. Logitech MX KEYS |
24.7 1.48 |
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2. Logitech K800 |
24.8 1.65 |
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3. Cherry STREAM |
26.1 2.43 |
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4. Dell KB216 |
22.8 1.62 |
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5. Logitech MK270 |
29.0 2.79 |
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6. Logitech MK295 |
23.3 1.42 |
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7. Logitech G513 |
39.2 2.59 |
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8. Corsair K70 |
42.6 2.49 |
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9. Corsair K70 with 40A-R O-Rings |
37.8 3.08 |
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