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Deafboy
··His Holiness Puer SurdusIs there a single inexpensive timegrapher that can be used for manual calibers 1861 & 861 and auto calibers 1045 and 565?
Timing tolerances - a guide to understand how they work
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jetkins
·Omega’s tolerances for this watch are that the Delta number must be no greater than 15 seconds, so on that measure this watch passes. The tolerances for the average daily rate are from –1 to +11 seconds per day, and since the average here is 0, this also meets the requirements Omega set out.
A lazy day project for someone with decent Excel skills, perhaps?
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Dan S
·Given the number of measured positions, the limits of tolerance, and the maximum delta, it should be possible to calculate the maximum loss or gain in any one position, beyond which it is mathematically impossible for the watch to be in spec.
A lazy day project for someone with decent Excel skills, perhaps?
Excel not required: +21/+6/+6
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MCC
·I don't expect the timekeeping to change when I case the watch...
You prompted me to read a bit more about the certification process and thought among others this was an interesting read https://www.govbergwatches.com/blog/chronometry-explained-cosc-certificate/ . I guess one of the main differences that this highlights is that a COSC certificate for a specific calibre is not the same as the timing of an individual watch.
I certainly have non chronometer watches that run well within COSC and in my view that is testament to the skill of the watchmakers that have serviced them in the past.
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hbombkid
·Great article Al!!! I always love when you do your write ups or even the advice you have given me before.
I have been out of the omega game for a couple years was a one watch Rolex guy, but always loved the brand. I just got a 2502.33 so gonna hang out on this forum for a little
I can use this as a guide for some amateur testing with my watch app. I am going to put it in a different position tonight then run a test. Day one was 9.5 sec will be interesting to see tomorrow.
I have been out of the omega game for a couple years was a one watch Rolex guy, but always loved the brand. I just got a 2502.33 so gonna hang out on this forum for a little
I can use this as a guide for some amateur testing with my watch app. I am going to put it in a different position tonight then run a test. Day one was 9.5 sec will be interesting to see tomorrow.
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FREDMAYCOIN
·Al, where can I send you a six pack of beer to? Thanks for sharing your knowledge.
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POinNY
·Thanks for putting this together. While it’s useful it still leaves a question to be asked - in regards to METAS movements, why does Omega explicitly state that this movement should never lose time and should always be in the 0-5 sec per day range? I have a new PO8900 that’s a week old that is about -1 sec after 24 hours. The first 15 hours on my wrist it’ll lose 1.5 seconds and then when I rest it crown up at night it’ll gain back 0.5-0.75 seconds but still be a hair slow by the end of that 24 hour period. So the fast position for this watch isn’t quite fast enough.
If Omega knows that daily wearer habits will be the most impactful in the accuracy why make a blanket statement that METAS watches should always be in the 0-5 second range? If it wasn’t for that comment by Omega I wouldn’t be bothered with -1 per day but the fact they say this makes me think something is wrong with the watch. Any insight?
If Omega knows that daily wearer habits will be the most impactful in the accuracy why make a blanket statement that METAS watches should always be in the 0-5 second range? If it wasn’t for that comment by Omega I wouldn’t be bothered with -1 per day but the fact they say this makes me think something is wrong with the watch. Any insight?
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ChrisN
·I have a new PO8900 that’s a week old that is about -1 sec after 24 hours. The first 15 hours on my wrist it’ll lose 1.5 seconds and then when I rest it crown up at night it’ll gain back 0.5-0.75 seconds but still be a hair slow by the end of that 24 hour period. So the fast position for this watch isn’t quite fast enough.
Out of interest, what are you checking this against?
Chris
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ChrisN
·The Official US Time app on IOS
When you're dealing with one second changes as you say, it would be worth checking with another source to be sure.
Chris
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POinNY
·I don't know that one and don't use IOS but, I use https://time.is
When you're dealing with one second changes as you say, it would be worth checking with another source to be sure.
Chris
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Archer
··Omega Qualified WatchmakerThanks for putting this together. While it’s useful it still leaves a question to be asked - in regards to METAS movements, why does Omega explicitly state that this movement should never lose time and should always be in the 0-5 sec per day range? I have a new PO8900 that’s a week old that is about -1 sec after 24 hours. The first 15 hours on my wrist it’ll lose 1.5 seconds and then when I rest it crown up at night it’ll gain back 0.5-0.75 seconds but still be a hair slow by the end of that 24 hour period. So the fast position for this watch isn’t quite fast enough.
If Omega knows that daily wearer habits will be the most impactful in the accuracy why make a blanket statement that METAS watches should always be in the 0-5 second range? If it wasn’t for that comment by Omega I wouldn’t be bothered with -1 per day but the fact they say this makes me think something is wrong with the watch. Any insight?
I’m not aware that Omega ever explicitly states that the watch will never run slow. In fact the whole point of my post is to explain why that isn’t so.
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Archer
··Omega Qualified WatchmakerThis is what I was referring to
No idea what the source of this is, as it looks like a post made on a forum or something. But note the first bullet point above they refer to the average rate, and again as I’ve explained in detail in my first post in this thread, if the average can be 0 then the numbers that make up that average can be less than 0.
Read the first post again, as that explains it all.
Cheers, Al
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POinNY
·No idea what the source of this is, as it looks like a post made on a forum or something. But note the first bullet point above they refer to the average rate, and again as I’ve explained in detail in my first post in this thread, if the average can be 0 then the numbers that make up that average can be less than 0.
Read the first post again, as that explains it all.
Cheers, Al
Looks like this is the full article
https://www.watchprosite.com/page-w...ed-master-chronometer-part-1-the-live-report/
But yes, to your point it doesn’t look like it’s coming from Omega. Your first post explained it all. I think this particular watch is spending a lot of time in a slower position which is skewing the average. I wear it on my left hand and crown up happens to be a fast position so I’m going to switch to wearing it on my right hand to see how that switches things up, if any.
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ilayd
·Al, thank you for taking the time to write this up. As someone just getting into automatic and mechanical watches, this is great info to see and learn. I also noted a lot of questions on this forum about deviations from actual time, and was curious. You have now clearly explained to me how its tested.
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POinNY
·Edited: Question was already answered in a different thread
Edited:
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Gruesome
·The Official US Time app on IOS
I'd recommend using time.gov, which will give you an estimate of your network time error contribution.
But regardless of that, I don't see how you get sub-second precision (in a single reading) comparing either to your watch.
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Deafboy
··His Holiness Puer SurdusBut regardless of that, I don't see how you get sub-second precision (in a single reading) comparing either to your watch.
Edited:
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POC67
·Hi Archer, I have POC 9900 which I bought new from Omega Boutique in December 24, 2018.
Let's say hypothetically the watch was tested by METAS in December, 2016.
So by the time I bought the watch, it was hypothetically 2 years old. The Result of METAS testing of my watch was + 0.1 spd.
My questions:
Is it possible that if METAS would test my watch now, the result would be slower, since the watch had been sitting in the store for 2 years?
From my limited experience, an automatic watch will run slower as it get older. For example: when I bought my Breitling Chronomat in 2005, the watch gained on average 5 spd. One year later the watch gained only 4 spd.
My POC now on average lose about 1 spd. (worn 5 days a week, 13 hours a day). My concern is the watch will lose about 2 spd one year from now, and will lose about 3 spd two years from now.
Thanks in advanced. (Btw, sorry for my bad English).
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