Hello Hal!
Hal Murray wrote:
What sort of accuracy are you expecting?
I hoped to measure the time drift within (or better than) 1 PPM
The main contribution to changes in drift is temperature.
Right, I cooled the system down by about 30° and the clock drift
increased by about half a second per day (measured with Plan B).
Does your environment have a stable temperature?
As stable as "room temperature" gets :-)
Are you calibrating your systems in the same location that
you will be running them in? (Or calibrating them on a test
bench and shipping them to a customer?)
The latter. While the system on the test bench, I wanted to measure the
time drift in order to calibrate the system clock. I also have a
temperature controlled cabinet available so I may try this again in a
more stable environment, if neeeded. But upto now, I am faced with two
different methodes for gathering the frequency offset: both give a
precise reading if repeated, but as the results differ, only one can be
accurate :-)
Cheers
Daniel
_______________________________________________
questions mailing list
[email protected]
https://lists.ntp.isc.org/mailman/listinfo/questions
