[time-nuts] What type of Crystal?

Ed Palmer ed_palmer at sasktel.net
Sun May 31 17:13:24 UTC 2009


   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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