Hello, recently I tried to trim the Racal Dana 1992 04E internal reference, using the GPS pps as a reference. I'd like to ask a pair of questions...
- First is about the method. I'm using the counter TI to measure it's own OCXO. The GPS is starting the count, the internal reference 10MHz (on the rear there is a reference output connector) stops the count and I log the result as I've done before with other oscillators. Is this a correct procedure? - Second, is about the behaviour of the OCXO after trimming. The OCXO seem not that stable after the trimming, like if the crystal started to age faster than before trimming, and now is slowly stabilizing. It's like the retrace of the crystals I've read about, but the instrument was never powered down in the last month. And it's oven has been on for the last year. Will a crystal retrace also after retrimming? The frequency of the crystal is slowing, in the first hours after the trimming rapidly, and now more slowly. After few days the frequency seem to be slowing somewhere around 1x10^-10 per day. Unfortunately I havent logged the counter for enough time before the trimming, but it measured the same Rb with less than 3 digits of difference (3x10^-10) in last 6 monthes. Thanks, Fabio. _______________________________________________ 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.