Re: [time-nuts] FA2 internal reference oscillator test
Hi If these are like the previous gear from the same designer, the parts (like the OCXO) that go in will vary quite a bit. In the past they seemed to be built by a wide range of people getting parts from a wide range of sources. If there is any ID on the OCXO, it’s probably worth passing that along. Bob > On Sep 29, 2019, at 1:11 PM, Mark Sims wrote: > > This morning the drift rate is down to 0.001 Hz/day. It's settling in > faster than expected. > > --- > >> The oscillator drifted at the rate of 0.00635 Hz / day, but the drift rate >> is slowing down (it's now around 0.005 Hz / day). It will be interesting >> to see how it ages in over the next few weeks. > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] FA2 internal reference oscillator test
This morning the drift rate is down to 0.001 Hz/day. It's settling in faster than expected. --- > The oscillator drifted at the rate of 0.00635 Hz / day, but the drift rate > is slowing down (it's now around 0.005 Hz / day). It will be interesting to > see how it ages in over the next few weeks. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] FA2 internal reference oscillator test
I did a test of the FA2 internal OCXO oscillator. The FA2 uses this as the reference if you don't connect an external reference. You can adjust the oscillator frequency with a small pot on the back panel. As shipped the oscillator was 0.10 Hz off. I adjusted to be within 0.003 Hz (I didn't try to fiddle it to be spot on). I did the oscillator test by having it measure an HP-5071A cesium oscillator (10 MHz) which is assumed to be (and is) spot on and very high quality. Any deviations from the noise floor test that I did earlier are mostly due to the FA2 internal oscillator. The wobbles in the frequency plot are due to air conditioning. The oscillator changes freq by around 0.00025 Hz / degree C. The oscillator drifted at the rate of 0.00635 Hz / day, but the drift rate is slowing down (it's now around 0.005 Hz / day). It will be interesting to see how it ages in over the next few weeks.___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
