COSC chronometer COSC is ControleOfficielSuissedesChronometres (COSC detection mechanism Omega Constellation Two Tone Diamond Bezel with Golden Dial 19103) acronym.
Refers to the Swiss watch movement sent Observatory accuracy test, who can pass the accuracy test of the movement can be marked with the words -Chronometer chronometer on the dial, while the purchase of new tables usually have a Swiss Observatory Table certification cards as proof that internal movement of the table passed such a test.
After a lot of table disk or Omega Replica UK Swiss high table cover, people can often see the word “Chronometer”, but, it is also possible that: with a watch, even with the same type of movement, the same case, but labeled “Chronometer” watch prices significantly higher than without this flag watch, which means it has at least expressed good meaning.
“Chronometer” in the English dictionary is omega replica generally interpreted as “chronometer”, it comes from a combination of up etymology Greek Chronos and Metron of intent with a measurement time of meaning.
The literal meaning roughly in line with real meaning, but too simple, beginners can not understand its true meaning literally, following the “Chronometer” make some detailed explanation.
“Chronometer” usually refers to a very precise timer, it could be a watch or a clock; may be a simple table may be complex tables.
It must have the appropriate equipment, every company, you can measure some of the information as required, but even these data to meet the standards, it still can not be called “Chronometer” Omega Constellation Two Tone Diamond Bezel with Golden Dial 19103.
Only in legal metrology departments to strictly determined by, and issue the relevant supporting documents or certificates, the timer can only be called “Chronometer”.
Switzerland “Chronometer”, usually refers only mechanical watch, its timing accuracy must pass inspection department official Swiss watch Tested and approved by the department certificate issued by the appropriate precision.
Because modern quartz digital watches timekeeping accuracy is much higher than any high-precision mechanical watch, therefore, quartz watch for “Chronometer” test in the traditional sense is meaningless; the same time, mechanical watches “Chronometer” meaning is no longer just a precision high meaning, its symbolic significance may be greater, it is an honor, a symbol of high quality using high-precision time reference COSC instruments and photographic equipment for the instantaneous state of the recording of the “Chronometer” certification test Data processed by a computer, which provides seven different tests, as long as one does not pass minimum standards, it means that the movement does not pass the test.
The seven test briefly as follows: 1. The average difference: The difference between the average daily fifteen-day test, the movement must be within -4 to +6 seconds seconds, the difference in average daily COSC Omega Constellation Two Tone Diamond day will be observed by the movement indicative time minus 24 hours before the observed movement indicates the time to get.
2. The average daily variation: COSC measured daily travel time error of the five positions, two vertical and three horizontal, after fifteen days of testing, received a total of 50 difference data, the average daily change in average difference must less than 2 seconds.
3. The maximum daily variation: five biggest difference measurement position, a day not more than five seconds.
The horizontal position and vertical position difference: the fourteenth day and fifteen days measured horizontal position average difference measured by subtracting the first and second vertical position average difference, its size must be - 6 seconds to +8 seconds into.
5. The maximum daily Omega Replica UK deviation: the difference between the maximum daily and average daily difference between the difference must be less than 10 seconds a day.

Day 6. The temperature difference caused by the change: will measure the movement were placed at 8 degrees Celsius and 38 degrees Celsius environment is poor, the difference between the daily high temperature of minus low temperature difference between the day, and then divided by 30 you can get variation due to temperature difference between day and its size must be less than 0.6 seconds / day.
7. rehabilitation difference: The average daily difference measured by subtracting the last day of the first two days the difference between the measured average daily recovery that was poor, its size must be controlled within 5 seconds.
More than seven test, all of the watch movement can be obtained through the “Chronometer” in the title and corresponding certificate.
Everyone COSC errors 1, COSC many friends that there is no error by the COSC watch is no error, I think this point is wrong.
Anything that will have an error, not to mention the mechanical watch, COSC movement is also such a problem, the current error standard room COSC -4 / + 6, that is, the speed of the standard daily movement must be within this range at, not more than four seconds slower, not more than six seconds faster.
Under normal circumstances, the new watch movement COSC error will be smaller.
2, COSC made no sense that a better understanding of the views of friends mostly watches, but also know the real top brands, such as PP, VC, AP every year there is little by COSC certified movement, leading to the conclusion, COSC does not make much sense .
I think COSC Swiss watch industry and even the global watch industry has its significance for both, and the reason that such a top PP table by COSC quantity is less and its brand positioning, yield related.
Imagine every year tens of thousands of block watch, and largely dependent on handmade watch how to talk to an annual output reached 700,000, with laser-tuned Rolex compared to what.
From the Rolex movement and durable accuracy, it became the king COSC from one angle, the COSC significance.
3, COSC is the highest standard I do not think anything word “most” one said.
Play table friends all know JLC, it has its own testing standards -Master1000 hours a movement test.
JLC COSC not participate in the competition, but it’s 1000 hours certification movement replica watches accuracy completely inferior COSC, and even some friends compared COSC and 1000 hours of testing methods in terms of the stability of the latter for the watch factory and after precision more meaningful.
I do not have a chance to try JLC, but many players can know JLCMaster1000 hour reputation accuracy is remarkable.
4, COSC difficulty is very high potential for several years, in that each of the manufacturers need to design their own manufacturing, assembly and movement in the year, so that their movement developed a certain degree of difficulty to reach COSC standards, then today is concerned, to ETA provided in terms of core systems, COSC is no longer difficult to match the height of the.
Any piece of unpolished ETA system core, as long as the patient watchmakers tuning can be achieved COSC standards (of course, without the polish, if not replace the balance and spring core components of the system can be a long time to maintain accuracy problem COSC) .
So today COSC Swiss precision movement is no longer the absolute selling point.
Any salesperson to you boast COSC magical time can ear into an ear out.
5, COSC price I think ultimately omega replica watches took his own real money to buy a table, the price factor is certainly one of the most important factors.
Since the watch factory sent to the Swiss Observatory certification agencies require a fee, while the factory and would not return to this part of the production costs increase, so COSC certification costs will be counted in the final purchaser who, in general, COSC movement and not through the same movement COSC compared to about 30 percent will go up on prices.
And if you come up with this 30 percent more money entirely your own.