Help Me Interpret Timing Test Results...

[3omar]

I am new to understanding movements. I had my Daytona regulated today because it was gaining +20 sec/day. The watchmaker told me that it needs service, as the amplitude is generally low. So that's something that I need to schedule in the next few months.

In the meantime, he adjusted the beat error, lubricated the escape wheel and balance pivot, and demagnetized the watch.

Here are the test results after he finished all the work. I am wondering if anyone here can help me interpret them, especially if something stands out as problematic.

[Old Expat Beast]

In very simple terms, beat error is acceptable, amplitude is low, and if you leave it crown up overnight and wear it all day, you should get pretty ok timekeeping. With those numbers, I'd get it serviced sooner rather than later, but it's not urgent.

[Rolex tom]

DU and DD positions should be when fully wound a minimum of 270, Max 310 for this calibre if my memory serves. The rest of the positions should be 250-260 as an ideal. Rolex tolerances are that the watch should drop to no less than 200 degrees of amplitude in the vertical positions after 24hrs run down. If this is your watch result after being fully wound your watch wouldn't last 24hrs, it would probably last quite a bit less than 24hrs.

Then X is the average rate of your watch and the D is the Delta which is the difference between the fastest position to the slowest. Your delta is good especially at such a slow amplitude.

Your watchmaker is right to suggest a service.

[watchmaker]

Originally Posted by Rolex tom

DU and DD positions should be when fully wound a minimum of 270, Max 310 for this calibre if my memory serves. The rest of the positions should be 250-260 as an ideal. Rolex tolerances are that the watch should drop to no less than 200 degrees of amplitude in the vertical positions after 24hrs run down. If this is your watch result after being fully wound your watch wouldn't last 24hrs, it would probably last quite a bit less than 24hrs.

Then X is the average rate of your watch and the D is the Delta which is the difference between the fastest position to the slowest. Your delta is good especially at such a slow amplitude.

Your watchmaker is right to suggest a service.

It's probably that if the amplitude were higher or lower than it currently is, the delta would be terrible.

This is due to a phenomenon where as the amplitude approaches a particular value, the positional error (which influences delta) becomes null, then as the amplitude continues to decrease the error reverses (sides which were gains become losses and losses become gains)

[DJ2020]

I would interpret those readings as it's time for a service.
Deviation is to great, amplitude is to low.

[saxo3]

Answers given already in OP's other thread for the same watch data

https://www.rolexforums.com/showpost...3&postcount=19
https://www.rolexforums.com/showpost...6&postcount=20