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LF Crystal Tester: 60 kHz Resonator Frequency Distribution

Histogramming all 50-ish resonator frequencies shows reasonably good distributions:

60 kHz Resonant Frequencies - histogram

60 kHz Resonant Frequencies – histogram

Notably, there’s no obvious suckout in the middle, as with those eBay Hall-effect sensors.

I don’t know what to make of the difference between the parallel and serial resonant frequencies for each tuning fork:

60 kHz Resonant Frequencies - Delta histogram

60 kHz Resonant Frequencies – Delta histogram

Perhaps each resonator’s frequency depends on its (laser-trimmed) tine mass and follows a more-or-less normal distribution, but the parallel-serial difference depends on (well-controlled) etched dimensions producing quantized results from three different masks / wafers / lots?

For reference, the resonators look like this:

Quartz resonator - detail

Quartz resonator – detail

Producing the histograms uses the LibreOffice frequency() array function, which requires remembering to whack Ctrl-Shift Enter to activate the function’s array-ness.

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