Page 158 - Testing Electronic Components

Third method is to use a Crystal Checker- With this way; normally the
crystal is placed in the feedback network of a transistor oscillator. If it
oscillates and the LED is lightening up, this means that the crystal is
functioning. If the crystal doesn’t work, the LED will goes off. Instead of
using LED as indicator, some other expensive crystal checker uses a
panel meter to indicate if the crystal is functioning or not. If you search
crystal information on the internet, you will find some websites that
provides tips on how to test crystal as well as how to build one. You may
build simple crystal tester by going to this website:

http://www.nuxie1.com/guides/crystal-tester.html

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