Using the DG8SAQ Vector Network Analyzer to identify an unknown component
https://www.youtube.com/watch?v=Ao653tz1kVE
actually it has a special program made for analyzing crystals
Greetings
and 73
KJ6UHN
Alex
On 3/1/2021 12:32 AM, Magnus Danielson wrote:
Hi,
On 2021-03-01 01:23, Attila Kinali wrote:
On Sun, 28 Feb 2021 18:35:57 -0500
Dan Kemppainen <[email protected]> wrote:
If any of you have any suggestions on where to find information on how
to get something like this to oscillate properly, guess at correct
parameters, or even measure any of the parameters I would really
appreciate it.
The best way would be to use a network analyzer and measure
the crystals LCR parameters. Using that you can use the
standard harmonic oscillator literature (Parzen, Frerking,...)
to design the circuit.
I seem to have misplaced my literature on how to measure
crystal oscillators. But if you search for "Neubig" and
"crystal measurement", you should be able to find some of
the nice documents that Bernd Neubig has written on the topic.
The same Neubig made a comment that your normal network analyzer isn't
such a good tool, even a very good one. The reason being you need both a
wide and narrow sweep to make the model values accurate enough. Most
network analyzers achieve the wide sweep, few do the narrow sweep and
then having that combined to fill in the LCR parameters of a suitable
model, not so much. Things you learn by eating breakfast with him. Turns
out that my network analyzer is good for the measurement, but not for
model fitting.
Neubig have been very much involved in standardizing measurements, and
doing those well to characterize accurate enough those high-Q resonators
have it's challenges that leads many efforts into incorrect values.
Cheers,
Magnus
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