[time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3

[Angus]

That near the end of the temperature range the direction could also
give a good indication - assuming that there is only one problem...

I think the 8600-3 is still an AT - the 8607 is SC.

Angus.


On Fri, 8 Dec 2017 15:40:08 -0500, you wrote:

>Hi
>
>One basic question - Is the frequency high or low? 
>
>Assuming it’s an SC and on the lower turn, frequency low is possible 
>with an off temperature oven. Frequency high is unlikely unless it’s *way*
>off temperature. How far off turn gives you how much delta F depends on
>the inflection temperature of the crystal. It matters if it’s a “true SC”or a 
>“modified SC”
.. If it is a true SC and running at 80C, that’s about 10 degrees
>below inflection. There will not be a lot of frequency change in that case.
>
>Many (but not all) modern crystal processes tend to age positive. If that is the
>case on these parts, a frequency high is the likely outcome of “age out of range”. 
>Even with a process that has a known tendency, only about 70% of them go 
>that direction over long periods of time. It’s not a perfect thing 
.
>
>Bob
>
>> On Dec 8, 2017, at 2:34 PM, Angus <not.again at btinternet.com> wrote:
>> 
>> 
>> The 8601 that I have was about 2 deg C off turnover when I got it, but
>> I can't remember what sort or frequency error that caused. The
>> temperature coefficient was terrible with that error.
>> 
>> Angus.
>> 
>> 
>> On Fri, 8 Dec 2017 13:05:14 +0000 (UTC), you wrote:
>> 
>>> 
>>> Gentlemen,
>>> We have an Oscilloquartz OCXO 8600-3that cannot any longer be adjusted into 5,000,000 Hz.It is about 1 Hz out of 5 MHz and turning coarse/fineadjustment potentiometers cannot bring the frequencyinto its specification.
>>> Oven temperature is about + 80C accordingto the thermistor and the operating voltageis at 24 VDC.
>>> Have Googled but the only thing that turns upis datasheets w/o any details.
>>> Before I take it apart and start lookingfor obviously broken components, isthere anyone that has a CLIP on this unit?
>>> 73
>>> 
>>> Ulf Kylenfall - SM6GXV
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