Hi Controller cycling is often a result of one of two things:
1) Resistance in the power lead 2) Extra insulation / dead air 3) Internal controller issues There are a few other possibilities, but they are remote enough that you are unlikely to ever come across them. There's no advantage to building a controller that's cycling. It was more likely a bug than a feature. Bob On Oct 13, 2010, at 4:00 AM, Magnus Danielson wrote: > On 10/13/2010 05:32 AM, Jim Lux wrote: >> >> >> On Oct 12, 2010, at 6:09 PM, Magnus Danielson<[email protected]> >> wrote: >> >>> Hi Bob and Dave, >>> >>> On 10/13/2010 02:57 AM, Bob Camp wrote: >>>> Hi >>>> >>>> Yes it is a reasonable expectation as long as you don't have a lot of >>>> drafts. A good TCXO can get down to sub 0.1 ppb over that period. >>> >>> This is why I like ADEV plots in datasheets. I rarely get to see them. TDEV >>> plots is a nice complement naturally. >>> >>> Cheers, >>> Magnus >>> >>>> Bob >>>> >> >> And I wish there were adev plots for cheap tcxo's on the mgr data sheets > > Me too. I have to make the measurement myself. In one case I found that the > oven control in one OCXO was unstable and had a resonance at about 7 second > period. It was possible to measure it on the current supply too. The > oven-control was having a relatively high-Q resonance and self-oscillation > around the stability point. It increased the ADEV at that point to almost > about 10 times more than expected. I learned that it was a good thing I > measured it and yes, that spec didn't exist in the datasheet. It is unclear > if they knew it or not. Even my half-crap setup proved valueable as I got > aware of an issue on sample level rather than out in production phase. > > Cheers, > Magnus > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
