Jim,
Why cut it open? It is relatively easy to measure just by power the
oscillator up. Just in this thread is an echo of a discussion we had
many years ago that explains the method.
The temperature curve for AT, BT and SC-cut is known and quite
different, so just measure the heat-up curve from room temperature to
oven temperature will be distinct for these types. I think the IT-cut
can also be identified uniquely this way.
If you have the crystal blank, you can use X-ray to see the
crystal-orientation.
Cheers,
Magnus
On 02/28/2016 05:48 PM, jimlux wrote:
On 2/28/16 6:23 AM, Bob Camp wrote:
Hi
The whole “BT Cut” issue was a big top secret in HP. They spent a lot
of time obscuring
the fact that they used BT’s. The belief was that if any of the other
outfits figured out that
was what they were doing, the competition would have better OCXO’s.
Can you tell what the cut is if you have the blank in front of you?
Wouldn't the competition just buy an instrument with the oscillator, saw
it open, and measure it?
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