Beat Error, Amplitude & Dialy Rate

[Endeavor]

Hello All;

 

While I was waiting for some parts for the Watch-O-scope (from Svorkoetter), I stripped, cleaned & oiled a N.O.S. Tissot 742 (ETA 2541). The watch has no dial, nor hands, so the only way to check is via the Watch-O-scope. Finished the Watch-O-scope and calibrated it on a quartz watch.

The initial measurements on the Tissot were way out and I adjusted the watch to the following readings:

Dial up           : - 4.7 s/d, 298 Amplitude, 0 ms beat error.

Dial down      : +12 s/d, 225 Amplitude, 0.5ms beat error.

Crown up      : - 21 s/d, 236 Amplitude, 3.3ms beat error.

Crown down : -5.3 s/d, 268 Amplitude, 5.3 ms beat error.

 

If I adjust the beat error, the daily rate changes, do I change the daily rate, the beat error changes. Before I continue the chicken vs egg game, and since I'm new to watches, I like to seek some advise..........

 

My questions are;

- Are the reading I get normal readings for a small 7-3/4''' ETA 2541?

- If they are, were do I aim for? Meaning; which of the 4 positions is the most "dominant" and is adjusted for, or does one try to adjust so that the daily rate averages out to zero? Is it normal that the beat error fluctuate this much by changing the watch orientation?

 

Hoping for some initial guidance or where I can read up on this subject?

 

Thanks on beforehand ;-)

 

Roland.

[syfre]

wrist watches are adjusted pendant down because most people wear their watch on their left wrist. The second position is dial up.

So, in my opinion, your movement is pretty good.

[Endeavor]

Thank you very much Syfre !

Yes, indeed, most people wear their watch on their left wrist.  Now I know which two orientations are the most important....thanks!

 

I did yesterday some further test and adjustments to the movement and the Watch-O-scope. The readings are now:

Dial up          : +11 s/d / Amp 231 /  BE 0.0

Dial down     : + 0.1 s/d / Amp 287 / BE 0.3

Crown up      : - 14 s/d / Amp 199 / BE 0.2

Crown down : - 16 s/d / Amp 200 / BE 0.7

 

As for the Beat error an improvement. Perhaps the Amplitude a bit low, but maybe that has to do with the "lift-angle" (not sure what that means yet) number in the Watch-O-scope, currently set at 51 degrees. Previous recorded Amplitudes (same lift-angle setting) were higher, the movement is the same, so it could be other things too........ to be investigated....

Judging from the given two most important orientations, Dial up & Crown down, the Daily rates nearly cancel each other out, So if the begin 1970's movement was to be worn on the left wrist, it may do pretty okay.

Lots to be learned, not only about the watches and theory, but also from the equipment I'm working with......

 

I'll soldier on....

 

Thanks again: Roland.