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cosc是controle officiel suisse des chronometres（瑞士天文台检测机构）的缩写。是指表的机芯送交瑞士天文台进行精准度测试，凡是能够通过精准度测试的机芯可以在表盘上打上天文台表的字样chronometer，同时，购入的新表一般都会有一张瑞士天文台表认证的卡片，以此证明该表的内在机芯通过了该项测试。
在不少瑞士高级表的表盘面或后盖上，人们常可以看到“chronometer”的字样，而且，人们还可能发现：同一款手表，即使采用相同型号的机芯、相同的表壳，但标有“chronometer”的手表价格明显高于没有这个标志的手表，这就意味着它至少有表示好的意思。
“ chronometer”在英文字典一般解释为“精密计时器”，从词源上来说它来源于希腊文chronos和metron的组合，原意有测量时间的意思。这些字面意思大致符合实际的意义，但过于简单，初学者不可能从字面上了解到它的真实含义，下面就“chronometer”作一些详细的解释。
“chronometer”通常是指极其精密的计时器，它可能是一块表或一台钟；可能是简单表也可能是复杂表。这要有相应的设备，每一个公司，都可以按规定测出一些资料，但即使这些资料满足标准，它仍然不能为“chronometer”。只有在法定的计量部门通过严格的测定，并出具相关的证明档或证书，这种计时器才可以称为“chronometer”。瑞士 “chronometer”，通常只指机械表，它的计时精度必须通过瑞士钟表检测部门的测试和认定，并由这个部门出具相应的精度证书。由于现代石英电子表的计时精度远高于任何高精度的机械表，因此，对石英表作传统意义上的“chronometer”测试毫；同时，机械表“chronometer”的含义也不再只是精度高的意思，它的象徵意义可能更大，它是一种荣誉，是一种高质量的象徵。
cosc在“chronometer”认证中使用高精度的时间基准仪器和用于瞬间状态记录的照相设备，测试资料经电脑处理，它提供七项不同的测试，只要有一项没有通过低标准，就意味着这个机芯没有通过测试。这七项测试简单介绍如下：
1. 平均日差：
通过十五天的测试，机芯的平均日差必须在-4秒到+6秒范围内，cosc的平均日差是通过将当日观察到的机芯指示时间减去二十四小时前观察到的机芯指示时间来得到。
2. 平均日变差：
cosc每天测量五个位置的走时误差，两个水平方向和三个垂直方向，经过十五天的测试，总共得到50位差数据，每天的平均的平均位差变化必须小于2秒。
3. 大日变差：
五个测量位置的大位差，每天不大于五秒。
4. 水平位置和垂直位置的位差：
将第十四天和十五天测得的水平位置平均位差减去第一和第二天所测的垂直位置平均位差，其大小必须在-6秒到+8秒之中。
5. 大日偏差：
大日差和平均日差间的差值，大小必须小于每天10秒。
6. 温度引起的日差变化：
将机芯分别放在摄氏8度和摄氏38度的环境中测量日差，将高温环境的日差减去低温环境的日差，再 除以30就可得到温度引起的日差变化，其大小必须小于0.6秒/天。
7. 复原差：将后一天测得的平均日差减去头两天测得的平均日差即得复原差，其大小必须控制在5秒以内。
以上的七项测试，全部通过的手表机芯可得到“chronometer”的称号和相应的证书。
cosc is the abbreviation of controle officiel des chronometres (swiss official observatory). refers to the movement of the watch to the swiss observatory for pcision testing any movement that can pass the pcision test will be able to jong chronometer the watch on the dial, and the new watch will generally have a card certified by the swiss observatory table to prove that the internal movement of the watch has passed the test.
on the dial or back cover of many swiss advanced watches, one can often see the words chronometer, moreover, it may also be found that, with a watches, even the same type of movement, the same case, but the chronometer watch price is significantly higher than the lack of a watch, which means that it is at least good meaning.
chronometer is generally interpted as a pcision timer in the english dictionary, which derives from the etymology of greek chronos and metron, meaning to measure time. these literal meanings are roughly in line with the actual meaning, but it is too simplistic for beginners not to literally understand what it really means, and to give a detailed explanation of chronometer below.
chronometer usually refers to an extremely sophisticated timer, which may be a table or a clock, or it may be a simple table or a complex table. this should have the corresponding equipment, every a companies, can be measured according to the provisions of some data, but even if the data to meet the standards, it still cannot be chronometer.
the timer can be called chronometer only if the legal metrology department passes a rigorous measurement and produces relevant certificates and certifications. the swiss chronometer, usually only refers to the mechanical table, its timing accuracy must pass the swiss official watch inspection department of testing and identification, and by this department issued the corresponding accuracy certificate. because the timekeeping pcision of modern quartz electronic meter is much higher than any high-pcision mechanical table, therefore, the traditional chronometer test of quartz watches is meaningless, and the meaning of mechanical table chronometer is no longer just the meaning of high pcision, its symbolic meaning may be greater, it is a kind of honor, is a symbol of high quality.
cosc uses high-pcision time benchmarks and photographic equipment for transient state recording in the chronometer certification, which provides seven different tests, as long as one fails to pass the minimum standard, which means that the movement has not passed the test. the seven tests are briefly described as follows:
1. average day difference:
through the 15-day test, the average daily difference of the movement must be within 4 seconds to + 6 seconds, and the average daily difference of the cosc is obtained by subtracting the indicated time of the movements observed from the date of the movement from 24 hours ago.
2. average daily variation:
cosc daily measurement of five locations of travel error, two horizontal direction and three vertical direction, after 15 days of testing, a total of 50-bit difference data, the average daily average of the change must be less than 2 seconds.
3. maximum daily variation:
the maximum position difference of five measurements is less than five seconds a day.
4. position difference between horizontal and vertical positions:
the average position difference measured at the 14th and 15 days is subtracted from the vertical position measured by the first and second days, which must be in the size of 6 seconds to + 8 seconds.
5. maximum daily deviation:
the difference between the maximum daily difference and the average daily, the size must be less than 10 seconds per day.
6. variation in temperature caused by:
the movement will be measured in the environment of 8 degrees celsius and 38 degrees celsius, the daily difference between the high-temperature environment minus the low temperature environment, and then divided by 30 can be caused by temperature variation, the size must be less than 0.6 seconds/day.
7. poor recovery: the average daily difference measured on the last day minus the average daily difference measured by the first two days is poor and the size must be controlled within 5 seconds.
the above seven tests, all through the watch movement can be chronometer title and the corresponding certificate.