Certus » 04 Eki 2010, 14:51
Nasa'n覺n uzay program覺 i癟in baz覺 saatlere uygulad覺覺 testlerin ayr覺nt覺l覺 d繹k羹m羹... tabi Omega Speedmaster bilindii 羹zere bu testlere dayanan tek saat oluyor...
In 1962, NASA decided to equip the astronauts of its future Gemini programm with a highly accurate, legible, resistant and reliable wrist chronograph.
Donald K. Slayton, head of the flight Crew Operations , took action to select the chronographs :
For the purpose of comparison tests, NASA purchased chronographs different brands from Corrigan's, a large retailer in Houston, Texas the following watches where purchased : Elgin, Benrus, Hamilton, Mido, Piccard, Omega, Bulova, Rolex, Longine and Gruen. Of theses only 3 where selected for the comparative evaluation testing :
Longines, Omega and Rolex (Omega movement : Omega 321 , Rolex movement : Valjoux 72 , Longines : Longines 13 ZN)
9 June 1965
1965 first qualification program ::
High temperature: 48 hours at 71繙 C followed by 30 minutes at 93繙 C. This under a pressure of 0,35atm and relative humidity not over 15%.
Low temperature: Four hours at -18繙 C.
Temperature-pressure: 0,000001atm and temperature raised to 71繙 C. Temperature then lowered to -18繙 C in 45 minutes and again raised to 71繙 C in 45 minutes. This cycle was repeated fifteen times.
Relative humidity: 240 hours in relatuve humidity of at least 95% and at temperatures varying between 20繙 C and 71繙 C. The steam had a pH value of between 6,5 and 7,5.
Oxygen atmosphere: Exposure to 100% oxygen atmosphere at a pressure of 0,35atm and a temperature of 71繙 C for 48 hours.
Shock: Six 11 millisecond shocks of 40g each in six different directions.
Acceleration: Linear acceleration from 1g to 7,25g within 333 seconds.
Decompression: 90 minutes in a vaccum of 0 10-6 atm and a temperature of 71繙 C and 30 minutes in the same vaccum but at a temperature of 93繙C.
High pressure: Exposure to 1,6atm for one hour.
Vibration: Three cycles of 30 minutes (lateral, horizontal and vertical), the frequency varying from 5 to 2000cps and back to 5cps in 15 minutes. Average acceleration per impulse 8,8g.
Acoustic noise: 130dB over a frequency range from 40 to 10000Hz for 30 minutes
Results of the tests :
Omega Speedmaster : gained 21 minutes during decompression test and lost 15 minutes during the acceleration test , the luminescence of the dial was lost during the test
Rolex Daytona : stopped running on two occasions during the relative humidity test and during the high pressure test when the sweep second hand wraped and press against the other hands
Longine Wittnauer : Crystal warped and disengaged during the high pressure test , same fault occured during the decompression test
Final conclusion : the Omega chronograph performmed satisfactorily.
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