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!
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
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
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
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
-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
-
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
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