I forgot to mention that the crystals for the E1938A had to
be calibrated for series resonance at 10 MHz.

Rick Karlquist N6RK

Didier Juges wrote:
> I think the main difference between parallel and series resonance is that in 
> parallel resonance mode, the capacitance of the crystal holder and wiring to 
> the crystal is part of the frequency determining parameters, and in series 
> mode it is not. So it may have a slight effect on temperature stability 
> (series would be better?) but it should have no other effect. 
> 
> If the parasitics are well controlled, it should have the same stability.
> 
> The crystal is operating the same way, at a slightly different frequency, so 
> if you had it specified for a series mode, you would be on the wrong 
> frequency if you put it into a parallel resonant mode oscillator..
> 
> Didier KO4BB
> 
> 
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