The recent discussion regarding the type of crystal in the HP 10544A
brought this question to mind. We're always coming across unknown
oscillators. Usually we can figure out the pinouts and voltages. Then
we can measure stability, aging, etc. But are there any tricks to
figure out what type of crystal is in the oscillator? How can you
detect the differences between AT, BT, SC, etc?
I think that AT crystals have a broader tuning range than SC and that
when warming up AT crystals tend to overshoot the final frequency and
fall back. Are these generalizations correct? Are there other tricks
to help differentiate the crystal types?
Ed
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