On 10/13/2010 05:32 AM, Jim Lux wrote:
On Oct 12, 2010, at 6:09 PM, Magnus Danielson<[email protected]>
wrote:
Hi Bob and Dave,
On 10/13/2010 02:57 AM, Bob Camp wrote:
Hi
Yes it is a reasonable expectation as long as you don't have a lot of drafts. A
good TCXO can get down to sub 0.1 ppb over that period.
This is why I like ADEV plots in datasheets. I rarely get to see them. TDEV
plots is a nice complement naturally.
Cheers,
Magnus
Bob
And I wish there were adev plots for cheap tcxo's on the mgr data sheets
Me too. I have to make the measurement myself. In one case I found that
the oven control in one OCXO was unstable and had a resonance at about 7
second period. It was possible to measure it on the current supply too.
The oven-control was having a relatively high-Q resonance and
self-oscillation around the stability point. It increased the ADEV at
that point to almost about 10 times more than expected. I learned that
it was a good thing I measured it and yes, that spec didn't exist in the
datasheet. It is unclear if they knew it or not. Even my half-crap setup
proved valueable as I got aware of an issue on sample level rather than
out in production phase.
Cheers,
Magnus
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