[time-nuts] Re: pulling some crystals
glen english LIST
glenlist at cortexrf.com.au
Thu Dec 7 21:44:55 UTC 2023
Hi Bob
Your comments are appreciated
mmmm. I had some, back in 2000, some 6 MHz, 98 deg C turning point
crystals used in a hot oven. after a few months, the aging went the
other direction. I never got to the bottom of it - IE was it was
oscillator components, or the crystal that was the instrumenbt in aging
the other direction.
On 8/12/2023 8:38 am, Bob kb8tq wrote:
> Hi
>
> Their idea that 3 days at 105 is the same as 1 year is â¦. errrr â¦. ummm â¦.. questionable. Even more so in an oven application that will have the crystal running at something well above room temperature (our starting point for the thread was heating it to 60C â¦.).
>
> Simple example:
>
> A typical OCXO crystal can easily be 20C above the max temp spec on the device. If the OCXO is rated to go to 70C, that would be 90. In the case of 85C, you are up at 105C. If indeed 3 days is a year, those 85C OCXOâs would have an insane daily aging rate. In practice, thatâs not what folks observe.
>
More information about the Time-nuts_lists.febo.com
mailing list