I´m a long time time-nuts lurker (I posted here just a dozen times). I make a few impedance measurement systems for material analysis (i´m a single man shop doing custom hardware for clients). Usually they´re based around a STM32F4 / F7 microprocessor: DAC generates sine signal (1-400KHz), ADCs measure them back, a few calculations later we have modulus / phase. I always used internal ADCs and DACs (12 bits each).
I now want to use external ADCs and DACs with more bits to push the limits, but i´m afraid that the poor performance of the STM32 PLL that drives the clock will get in the way, so I plan to drive the "load" of both DAC and ADCs from an external signal derived from a TCXO using a clock divider. To get some sense of how much things are improving (or not) I need to somehow measure these clocks and get a meaningfull measurement about how good (or bad) they are. The tools I have are a Hameg HM8123 with a 10MHz OCXO I shoehorned inside and a Picotest U6200A with original OCXO. I can log period information from both using serial/USB port. I can make a histogram of the data. I don´t have any better idea about what to do and would like to hear from you :) Daniel _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.