Hi The crystals in the TCXO's are about as well mounted for hysteresis as you can practically do for the money. A typical clock oscillator guy does not worry much about that sort of mounting.
Sorting is going to be a good idea. There are a number of things you likely will want to weed out. I'd plan on looking at a couple of different frequencies as well as vendors. Some quality time with a slow ramp / high data rate test setup should tell you a lot. 100 readings a degree and sub 1 degree per minute is the typical way to do it. Getting your temperature probe so it doesn't lag can be a hassle even at 1C/ minute Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Jim Lux Sent: Friday, September 07, 2012 4:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] crystal (or MEMS) oscillators with low hysteresis On 9/7/12 12:20 PM, Bob Camp wrote: > Hi > > I'm guessing that power is also an issue, so cheap OCXO's are out. If that's > true, I believe you are already at the "cheap vs good" inflection point with > the cell phone TCXO. At < $2 they are pretty tough to beat. Just the fancy > crystal in something better is going to give you a big boost in the price. > power and size.. Yes.. the cellphone tcxo is probably it.. but I was wondering if something else that's not "TC" might not have better hysteresis properties. Short of buying a batch and trying them... which I'll do, but before just randomly picking things out of the Digikey catalog, it's possible someone has more insight into the inner workings of cheap clock oscillators. For instance, they make inexpensive fairly high performance low power oscillators for COSPAS (emergency locator beacon) and wildlife tracker use. But you'd never know that they have the higher performance unless you asked. AT the high, expensive end, I've got all the data I need.. _______________________________________________ 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. _______________________________________________ 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.