Internal or External Clock

[Ermos (Erno)]

Welcome to the dCS community, Mark.

This will help you a bit further:

Would I benefit by adding a master clock to my Bartok

The crystals do not exactly wear out but the clock is conditioned and calibrated at the factory. Over time the calibration will drift and eventually the unit may need to be returned to the factory for recalibration. I cannot advise when this may be . The top of the range Vivaldi clock actually generates a warning display when it becomes necessary although this feature is not available with the Rossini clock. I have been using dCS wordclocks ( three of them) since the early years of this century…

and

https://dcs.community/t/faq-master-clock-displays-cal/282/2