Hello again,
1/ Wavecreest: 1990s diansaurs, cant get them runnong, used old windows I recall.
2/ I never saw or used the comparisons you make re jitter.
The accuracy of PERIOD depends on the REF clock of the scope or analyzer. Never an issue!
The jitter is a statistical number derived from a period sample set.
The resolution is the minimum increment in a jitter measurement, eg a histogram is 100 pS in TA320 and 25 pS in TA720.
Sub pS measurements are best researched at your local Swiss facilities:
CERN near Genève and ETH in Zurich also Zurich Instruments.
Kind Regards,
Jon