[time-nuts] OCXO settling

2011-09-14 Thread Murray Greenman
There are of course many levels of performance in OCXOs, but in general the ageing slows down with time, and veteran OCXOs can be very good. I recently tested the OCXO in an old HP5245L counter (circa 1970), last calibrated in 1985, and it was still within 100ppb of 10MHz after 24 hours warmup!

Re: [time-nuts] OCXO settling

2011-09-14 Thread Paul A. Cianciolo
Of Murray Greenman Sent: Wednesday, September 14, 2011 3:29 PM To: time-nuts@febo.com Subject: [time-nuts] OCXO settling There are of course many levels of performance in OCXOs, but in general the ageing slows down with time, and veteran OCXOs can be very good. I recently tested the OCXO in an old HP5245L

Re: [time-nuts] OCXO settling

2011-09-14 Thread Magnus Danielson
On 14/09/11 23:34, Paul A. Cianciolo wrote: Murray, Thank you. When an OCXO is unpowered for some time, it undergoes a further ageing process when it starts up next. This is specified in some data sheets, and can typically require an hour of burn-in for each day left unpowered before

Re: [time-nuts] OCXO settling

2011-09-14 Thread Hal Murray
Maybe 2 days would be a good compromise? I don't think you are going to get a solid answer, especially since you haven't mentioned how good of a result you want or need. How about recording some data and telling us what happens? -- These are my opinions, not necessarily my employer's. I

[time-nuts] OCXO settling

2011-09-14 Thread Mark Sims
No, more like two months! It typically takes a couple of MONTHS for an oscillator that has not been used in a long time to stabilize! This is very evident when firing up an old HP 5370 or Thunderbolt.This extended period of time is why people leave their oscillators powered at all

Re: [time-nuts] OCXO settling my goals

2011-09-14 Thread Paul A. Cianciolo
-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: Wednesday, September 14, 2011 5:57 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OCXO settling Maybe 2 days would be a good compromise? I don't think you are going to get

Re: [time-nuts] OCXO settling my goals What I do have

2011-09-14 Thread Paul A. Cianciolo
- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Paul A. Cianciolo Sent: Wednesday, September 14, 2011 8:23 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] OCXO settling my goals Murray, You hit the nail right

Re: [time-nuts] OCXO settling my goals What I do have

2011-09-14 Thread Will Matney
of precise time and frequency measurement' Subject: Re: [time-nuts] OCXO settling my goals What I do have I forgot to mention. I do have data for following. The Rakon OCXO The Spectracom 8165 WWVB Disciplined Oscillator Ball-Efratom Rubidium Telco version 24 hours worth of data at 10 Mhz using