They then expose it to 15,000 gausses for a full 24 hours and test its daily precision for any deviation.Then the caliber is cased and put into a watch and they test how it handles the same fifteen-thousand gauss magnetic fields.The first of these tests gauges how it reacts to being exposed to magnetic fields of 1.5 Tesla / 15,000 gauss while in two different positions.METAS labs take the watches and have their movements tested for a number of things in order to reach a minimum precision of 0/+5 seconds per day. A testing institute called the Federal Institute of Metrology, also called METAS conducts the testing after the watch received a COSC certification. ![]() The first OMEGA watch that was given the designation of Master Chronometer was the Globemaster which is part of the Omega Constellation series. OMEGA, eager to rise to the challenge, embarked on a mission to state its dominance in chronometric precision with a new chronometric precision designation known as the Master Chronometer. They had since attached to each watch they sell that meets this standard in accuracy and precision a seal saying "Superlative Certified" on one side and "Rolex SA Geneve" on the other. They had since decided to expand their highly strict ☒ testing to every one of their watches. The first Rolex movement to ever go through Superlative Chronometer testing and get the new and improved esteemed designation was the Rolex 3255 movement found in the Rolex Day-Date 40mm. Once this is accomplished the watch is ready to be shipped out with a new Superlative Chronometer designation. ![]() That is at least twice as accurate as a COSC chronometer! Rolex took the chronometer to the next level with an extra round of examination and fine-tuning. Once the watch movement is returned to manufacture, Rolex cases the caliber and a series of tests designed to simulate the use of the watch when worn in a "real-life" situation is conducted followed by fine-tuning until the accuracy of -2/+2 is achieved. Read more to find out what this entails and what type of accuracy you can then expect from both watchmakers. Omega hires another 3rd party lab called METAS and Rolex is of the opinion that if you want a job done right, do it yourself and this means that they do this in-house as opposed to a 3rd part lab until they get the results that they want. Not happy with that standard, both Rolex and Omega felt that they could work on post-COSC certification precision. Simply put, they are both required to be certified chronometers and go through the standard COSC ISO 3159 testing before any further tests are done. COSC testing involves only the watch movement/caliber itself and for two consecutive weeks, the movements are tested at three different temperatures and 5 different positions.īy the time the movement received its chronometer designation, it has reached an accuracy of -4/+6 seconds per day. Let's look at how watches with these titles or designations are similar. What is a Superlative Chronometer? It is a combination of two pedigrees found only on Rolex watches, one by COSC and another by Rolex. ![]() It is currently only available on Omega watches and indicates that the watch has not only has precision but high standards on many important factors. What is a Master Chronometer? It is a combination of two pedigrees, one by COSC and another by another lab called METAS. t is a neutral third-party lab that gauges the precision of a watch to ensure they meet very high standards. What is COSC? It is the Official Swiss Chronometer Testing Institute and is an acronym for its French name Contrôle Officiel Suisse des Chronomètres. Rather, it's a mechanical feature (or complication as it's called in watchmaking) that provides a stopwatch function to a watch. What is the difference between a chrono graph and a chronometer? A Chronograph is not a designation from COSC.
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