Archive for September 7th, 2017
60 kHz Quartz Tuning Fork Resonator Data
Posted by Ed in Electronics Workbench, Science on 2017-09-07
The first batch of 25 resonators:
60 kHz TF26 resonators – Batch 1 data
The second batch from the same eBay source arrived a few months later and I finally got around to measuring them:
60 kHz TF26 resonators – Batch 2 data
A dot of green Sharpie on the AT26 cans identifies the second batch:
60 kHz TF26 resonators – Batch 2 marking
The alert reader will notice an un-measured 25th resonator at the bottom of the first batch. I dropped one from the second batch under the Electronics Workbench, found it, then also found its long-missing brother; now I have a genuine it’s-never-been-used resonator, just in case the need arises.
A quick-and-dirty simulation shows the series and parallel resonant peaks come out close, but not dead on, the actual measurements:
Simulation – 60 kHz resonator
The model obviously doesn’t exactly match reality, which isn’t too surprising. However, I don’t understand something about tuning fork resonators, because the parallel resonance shouldn’t shift upward with the series resonant peak when the circuit gains a 24 pF series capacitance:
Resonator 0 Spectrum
Suffice it to say that doesn’t happen with the simulation.
More study is needed, as the saying goes.
-
You are currently browsing the archives for Thursday, September 7th, 2017
Blowback