The ideal tremor is perfectly sinusoidal, that is, perfectly regular.  Myoclonus is typically the opposite.

Regularity may be a typical feature of tremor, but clinically is hard to define with precision. Considering regularity of tremor also raises the issue of tremor merging into myoclonus. Tremor and myoclonus may often be found associated with one another, and at times, the conditions may overlap or be impossible to distinguish from one another, for example, “myoclonic tremor”.  Tremor in dystonia is often coarse and irregular.