rickhar...@gmail.com said: > I need to find a solution for a RTC which provides 0.1 ppm accuracy in > the form of a RTC/MPU or some other combination, oscillator etc.. I'm > creating some sensors which all need to do timed measurements and need > to be at the same time. They can get a time beacon every 10 seconds > but then need to accurately perform independently 20x / sec. They > cannot communicate with each other and other than the time beacon are > unconnected. After a period of time they will send their time-stamped > data out.
What do you mean by "0.1 ppm accuracy"? I'm assuming you mean over temperature changes. How accurate is your beacon? What sort of accuracy do you need? Assuming that you don't have wild temperature swings... Just calibrate whatever crystal you would normally use. It will be off by many ppm, but at the ppm level, it's stable at a given temperature. Using your 10 second beacons, you can measure the actual frequency and correct in software. It will change with temperature, but that will be slow enough so you can track it. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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.
