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Question about position accuracy for Archer

fc3861
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Hello @Archer ,

I was just curious about positional variance when it comes to accuracy.

I have a less than year old PO chrono (9900 movement) and I've noticed it's spectacularly accurate but is on the slow side. I wear it every day, all day from the time I get up until bed. I do have a desk job so I spend the majority of my day sitting at a desk.

I've noticed that the watch will be about -1 to -2 seconds after about a week of setting the time from time.gov (US official time website).

I always compare and set from this same time source and at night I lay the watch on my dresser dial facing up.

I wanted to know if there is any other positions I should try or if this can be normal? I was under the impression a METAS movement should never be slow even if every so slightly.

Thank you so much for all you do for this forum, I really appreciate your expertise.

FC
 
64Wing
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M'Bob M'Bob
Al, how accurate is the missionary position?
I was thinking about making such a joke, but I got a little shy...lol not sure why
 
Canuck
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M'Bob M'Bob
Al, how accurate is the missionary position?

It depends on the position the watch is placed in when you take it off, when you are in that position.
 
64Wing
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Canuck Canuck
It depends on the position the watch is placed in when you take it off, when you are in that position.
In a shoe? Sorry, things can get rushed
 
marcn
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M'Bob M'Bob
Al, how accurate is the missionary position?
"Little too accurate." -MBob's mom
 
KeyWestPaw
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fc3861 fc3861
Hello @Archer ,

I was just curious about positional variance when it comes to accuracy.

I have a less than year old PO chrono (9900 movement) and I've noticed it's spectacularly accurate but is on the slow side. I wear it every day, all day from the time I get up until bed. I do have a desk job so I spend the majority of my day sitting at a desk.

I've noticed that the watch will be about -1 to -2 seconds after about a week of setting the time from time.gov (US official time website).

I always compare and set from this same time source and at night I lay the watch on my dresser dial facing up.

I wanted to know if there is any other positions I should try or if this can be normal? I was under the impression a METAS movement should never be slow even if every so slightly.

Thank you so much for all you do for this forum, I really appreciate your expertise.

FC
Even on a cosc watch, I think 1 sec a day is pretty good.
 
fc3861
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KeyWestPaw Cayohuesovespa
Even on a cosc watch, I think 1 sec a day is pretty good.

Yes, of course, and I'm not complaining about accuracy at all, I was just under the mistaken impression that a METAS certified watch should never run slow. It all makes sense now and I'm thankful for Archer's elaborate explanation about the different positions tested and averaging that goes on etc. etc. I'm still in awe that these modern mechanical watches can keep time as precisely as they do. It's just amazing.

I do have one more question for @Archer though and that is: given your knowledge of the PO chrono watch and 9900 movement, is there any position that you think would be more likely to run fast or can that vary as well? Is the only way to find out through experimentation with my particular watch? In other words, on a particular watch model where the movement is always mounted in the same orientation and gravity doing its thing, is it predictable which position will be slow versus which will be fast?

Thank you!
 
Archer
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fc3861 fc3861
Yes, of course, and I'm not complaining about accuracy at all, I was just under the mistaken impression that a METAS certified watch should never run slow. It all makes sense now and I'm thankful for Archer's elaborate explanation about the different positions tested and averaging that goes on etc. etc. I'm still in awe that these modern mechanical watches can keep time as precisely as they do. It's just amazing.

I do have one more question for @Archer though and that is: given your knowledge of the PO chrono watch and 9900 movement, is there any position that you think would be more likely to run fast or can that vary as well? Is the only way to find out through experimentation with my particular watch? In other words, on a particular watch model where the movement is always mounted in the same orientation and gravity doing its thing, is it predictable which position will be slow versus which will be fast?

Thank you!

There is no set pattern - you will have to find out by testing it.

Cheers, Al
 
YY77
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fc3861 fc3861
Yes, of course, and I'm not complaining about accuracy at all, I was just under the mistaken impression that a METAS certified watch should never run slow. It all makes sense now and I'm thankful for Archer's elaborate explanation about the different positions tested and averaging that goes on etc. etc. I'm still in awe that these modern mechanical watches can keep time as precisely as they do. It's just amazing.

I do have one more question for @Archer though and that is: given your knowledge of the PO chrono watch and 9900 movement, is there any position that you think would be more likely to run fast or can that vary as well? Is the only way to find out through experimentation with my particular watch? In other words, on a particular watch model where the movement is always mounted in the same orientation and gravity doing its thing, is it predictable which position will be slow versus which will be fast?

Thank you!
I don't mind a position running slow as long as I can balance it with a fast position overnight, here are my numbers for a 3861 (it's not always a gain or loss for the same position in my watch but keeping it around zero is good enough in the last 3+ months):
Screenshot_20210831-174132.png
 
fc3861
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YY77 YY77
I don't mind a position running slow as long as I can balance it with a fast position overnight, here are my numbers for a 3861 (it's not always a gain or loss for the same position in my watch but keeping it around zero is good enough in the last 3+ months):

Exactly! I'm trying to figure out if I lay the watch down a different way at night if I can prevent it from ever being slow on average.
 
YY77
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fc3861 fc3861
Exactly! I'm trying to figure out if I lay the watch down a different way at night if I can prevent it from ever being slow on average.
Like Al said try, you'll know after a week if you test all 6 positions overnight.
 
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