The Breitling Watch Source Forums

How do you monitor your Breitling as far as losing time??

Open time.gov on your computer for the atomic clock, when the seconds hand on your watch hits 0 pull the crown out to stop the watch. Set the time to open minute ahead of the atomic clock, when the atomic clock moves forward and catches up to the exact time on your Breitling push the crown back in which will then start the Breitling and your watch and atomic clock will be in sync. Come back in 48 hours and check to see if it's fast or slow then check again in another 72 hours. Then you will have a good idea on your watch's accuracy.

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"I don't own any watches, I just lease them"

Obviously after 48hrs divide by 2, and 72hrs by 3 etc to get the average daily gain or loss. It should be between -4 +6 seconds per day for a automatic. That being inside COSC specs.

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Breanach78

A Few Breitlings.

There are pros and cons to averaging over several days, as opposed to getting the specific gain or loss each day. The upside is that you can get a general sense of what your watch gains or loses on average every day, without getting caught up in the minutiae of minor fluctuations day to day, which might be attributable to changing conditions to which the watch is exposed. (E.g., resting on its side one night, on a winder the next; worn for 2 hours one day, 12 hours the next, etc.) The down side is that it doesn't allow you to assess just how wide that variance is. If the watch is under mostly the same conditions every day, and it has wide swings in gain or loss from day to day, that would be something you want to know about, as it could indicate a problem with the movement.

If you're up for it, my recommendation would be setting it according to Sergio's advice, then checking it and resetting it the same time every day for a week, ensuring the watch is under the same conditions every day and night. If the daily gains or losses are within a few seconds of each other, then average them together to come up with your general variation. Also, pay attention to the delay on the Time.gov clock. Make sure the delay is the same each time you check it. If you set it when the delay is 0.2 seconds, then check it when the delay is 1.3 seconds, you'll think the watch is more off than it actually is.

There are always going ot be variations day to day - temperature variations, activity variations when wearing the watch that affect the remaining power reserve, etc. To get an accurate number you need to consider a time period of a few days to try and even out the extremes. Regulation is the same concept, it's not about eliminating errors, it's about averaging the various errors to net zero or as close as possible.

I measure the others against the B1

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Al

“Quis custodiet ipsos custodes"