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Beat Error...to Correct Or Not Correct?

Don

By Don
in Watch Repairs Help & Advice

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Don Super WRT Addict

Don

Posted
Posted

I finished assembly of one of my project movements, a Caravelle 11DP (Citizen 0201). Before I started, I put the watch on the timing machine to get a baseline. The results were:

 

D/U

Rate: +31s/d

Amplitude: 240°

Beat Error: 0.6ms

 

After cleaning, oiling and reassembly, the results were:

 

D/U

Rate: +18s/d

Amplitude: 296°

Beat Error: 0.9-1.0 ms

 

I'm happy about the rate improving, but I'm not happy to have increased the beat error. Is .9ms a big deal? Is it worth futzing with? The balance doesn't have a moveable hairspring stud.

 

Is the amplitude of 296° high?

 

Thanks in advance.

 

Don

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Geo Distinguished Member

Geo

Posted
Posted

Providing your not getting snow on the screen then it is in beat.

If you are getting snow, there is more wrong than just beat error. The beat error is indicated by how far apart the traces are on the timing screen, ideally they should be superimposed on each other and only show one line. The watch will run just fine with the error that you have and as Clockboy says you could just make a small rate adjustment.

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