The Breitling Watch Source Forums

I am not sure if this question has been asked before but anyone knows how accurate is an automatic watch's chronograph as compared to a quartz stop watch? If not as accurate normally how much is the variation, say if we run both for a day? Trying this out myself.

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm

I would imagine that the accuracy of the Chrono should be the same as the watch itself.
So if the watch is 4 sec fast per day then so will the Chrono.

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"It is just a matter of time!"

Pretty much.

The rate is generally affected a little bit by the chronograph - slightly more inertia in the running train reducing the amplitude, but it shouldn't be more than 1 - 2 seconds a day of impact. Additionally the impact isn't on the chronograph alone, the rate of the watch is also impacted - i.e. the watch and chrono will always run at the same rate.

I just tested my chronograph, left it running together with the stopwatch function on my quartz watch for 7 hours plus and the result was 3 sec faster than the quartz at the end of it. However I noticed a worrying sign, the time gained 9 sec at the end of it.

The other times when I left my chronograph running for 12 to 15 hours, I was wearing the watch for the first 5 to 7 hours before I left the watch lying untouched for the rest of the day. The time would gain about 3 to 4 sec at the end of it. Today is the first time I left the watch lying untouched immediately after a full wind and activated the chronograph. After 7 hours plus the time gained about 9 sec. From what Roff explained above I believe this is not normal and should have still run within COSC specs?

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm

I just stopped my Chronos after about 45 hours of my little infamous test which was by the way measured against my "reference" Timex quartz
Over those 45 hours with the chronos running, both the Chronomat and the TOC gained 2 secs and the Navi gained 3 secs. All three Chronos reset perfectly back to zero.
I think that's acceptable. Phew!

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"It is just a matter of time!"

Those number are pretty out of COSC specs. I leave me chronographs running all the time (just because it looks cool), and it's well within COSC standards. When not running the chronographs does the watch hold COSC standards?

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Nick


Rolex Datejust 18K + SS

Navitimer 01 L.E.

What way was the watch placed? Back down, face down, side down. This may impact on the timing. As a rule a watch on it back will run faster than if it were place on its side.

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Breanach78

A Few Breitlings.

Yes, but the variation should be broadly consistent from chrono on to chrono off regardless of position - i.e. the chrono will impact rate by the same number of seconds per period regardless of position.

Well after the worrying results yesterday, I reset the chronograph and ran it again overnight till this morning which was total about 8 hours. Morning when I checked, this time the time gained only 1 sec. For the position, the watch was left upright all the way. After stopping my chronograph in the morning. I left it also in upright position all the way till now with the chronograph off, so total about 14 hours since morning and when I just checked, no time gain or loss since morning. I think I will wait for the power reserve to end, do a full wind again and test it immediately with chronograph on for 12 hours to see whether any abnormal results again. Will keep u updated. Thks for the help guys...

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm

Ya it will vary only about 1 sec per day without the chronographs on... Even with the chronographs on it would still keep within COSC standards. This time is only a little different as in I activated the chronograph immediately after a full wind and left it upright and untouched for 7 hours plus, ending up with 9 sec gain. The previous times after activating the chronograph, I would wear the watch for 5 to 7 hours before leaving it for another 7 to 8 hours upright and untouched. And it wasn't after a full wind but after wearing the watch for a few days since a full wind. Previous times results were within COSC specs.

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm