====== Deviation ======
The **deviation** is the time value (in seconds or minutes) in which a [[watch]] differs daily compared with its normal [[rate]]. The rate deviation is the actually desturbing inaccuracy of a watch.

When determining the time deviation the watch must always be in the same position and at the same temperature (unless you want to determine the effect of temperature on the rate deviation).

Beneath the influence of temperature on the rate deviation one measures also the influence of the location of the [[movement]] on the rate deviation. So the [[rate]] of [[wristwatch]]es is measured in different locations over a certain period of time lying with dial up, lying with dial down, standing with crown at the right, standing with [[crown]] at the left, standing with crown above, standing with crown below. The measurement series of the different positions are then compared.

The rate deviation is determined by a [[rate measurement]] on a [[timegrapher]] (as in the case of the [[rate]]) or via computer programs for the determination and comparison of gait results.

At the [[chronometer certification]] watches with a particularly low rate of variation are awarded with a certificate from an official source and obtain the title "chronometer".

===== Literature =====
  *[[Das große Uhrenlexikon]]; Author [[Fritz von Osterhausen]]; ISBN 3898804305


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