Crystal Tester

This general-purpose crystal tester can be used to test and measure quartz crystals having frequencies from 30 kHz to 100 MHz. It is suitable for use as a front-end accessory for a frequency counter to directly measure the frequencies of fundamental-mode crystals up to approximately 24 MHz. For overtone crystals, however, only the fundamental frequency can be measured. For example, the counter will indicate a frequency of 20 MHz for a 5th-overtone crystal that oscillates at 100 MHz.