On 2016-09-02 12:20, Wenqin SHAO wrote:
Thanks for confirming. The specified frequency is indeed well respected. When there is no data-missing, the interval shift rarely exceed 14s, small compared to 240s the scheduled interval. What intrigues me is that the exact phase/timing is as well kept after power cut and reboot.
The probes have a crontab-like mechanism to remember what they need to do. As long as their clock is more or less ok, they will stick to the pre-allocated times and tasks.
By the way, can a measurement be as well skipped, as designed behaviour, due to scheduling issues mentioned by @Cristel?
We're trying to avoid overloading probes, but not everything is under our full control. Some measurements can pile up; Cristel & Randy & co. had a paper about the observed (worst-case) behaviour. Regards, Robert