Quote:
Originally Posted by SearChart
It is designed to run accurately when the mainspring is fully wound or close to it. They will guarantee that -2 / +2 average for 24 hours, after that the watch will continue to lose amplitude and might become inaccurate.
I thought this thread was started to collect useful data about the known amplitude issue the 32 series tends to suffer from, to see how many in this small group of owners are affected.
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Bas, could I trouble you to ask about the relationship between amplitude and temperature? From what I am observing, amplitude is higher when the watch is warmer and lower when the watch is colder.
When my 3130 comes off of my wrist when I've been wearing a sweater that covers it and it is very warm, its DU amplitude is generally 305-315 degrees (but less when I am wearing say a t-shirt). Once the watch reaches ambient temp (about 22 degrees), it is more on the order of around 290-295 degrees. If I put it in the fridge and then measure amplitude, it is substantially lower and then progressively increases as the watch comes to room temp.
For the sake of my own curiosity, I wish to know what the cause is here? Is the viscosity of the lubricant used on the balance wheel pivot increasing in colder temps, resulting in greater resistance and not quite as strong of a 'swing'? (and the opposite when warmer?) Does it have to do with expansion/contraction of the materials in different temperatures, such as the hairspring itself? (I would assume this is not the case given the Parachrom Bleu's design to be extremely resistant to temperature variations?)