[Boatanchors] Testing a crystal

[Bry Carling]

You can also use a receiver instead of the oscilloscope, so long as you know roughly what frequency the Crystal should be. These techniques are useful if you are grinding or penning a Crystal.

Best regards - Brian Carling, AF4K CRYSTALS





On Jul 8, 2018, at 4:25 PM, "w5jo at brightok.net<mailto:w5jo at brightok.net>" <w5jo at brightok.net<mailto:w5jo at brightok.net>> wrote:


Use a signal generator that you can read the frequency or use a frequency counter hooked to the secondary output.  I use a URM 25F with the high output to the input of a signal generator.

Hook the hot lead from the signal generator to a 56K resistor then to one pin of the crystal.  Hook the ground from the generator to the other pin of the crystal.

Attach a 3 pf capacitor to the hot pin of the crystal then to the input of a X 10 scope probe.  Probe ground goes to the ground pin of the crystal

Tune the signal generator for a null on the scope.  That is the frequency of the crystal.  The accuracy will depend on your frequency counter or the readout on the sig. gen.

Jim
W5JO
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