How many measurements does a typical phasor meqasurement unit (PMU) capture?
The PMU samples power at the nominal frequency of 50 or 60 Hz and reports on current and voltage at a typical rate of 48 samples-per-cycle with one micro-second accuracy. The output of the PMU is a stream of time-tagged synchrophasors at a rate of up to 60 samples-per-second.
 https://www.safaribooksonline.com/library/view/smart-grid-communication-enabled/9781118820247/OEBPS/9781118820247_epub_c_13.htm