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How to measure the quality of quartz crystals

Release time:

2024-06-05 10:09

At present, how to measure the quality of quartz crystal in the contemporary application can be described as more and more widely, how to measure the quality of quartz crystal is worthy of our study, now we have a deep understanding of how to measure the quality of quartz crystal.

In appearance, it is neat, no cracks, the pins are firm and reliable, and the resistance value is infinite. If the resistance measured with a multimeter is very small and very close to zero, then the measured crystal leakage or breakdown, has been damaged. If the measured resistance is infinite, it cannot be determined whether the crystal is damaged. The inspection method at this time: use a test electric pen, insert its cutter head into the live wire hole of the mains, hold one foot of the transistor with your finger, and touch the top of the test electric pen with the other foot. If the neon bulb is red, it generally indicates that the crystal is good. If the neon tube is not bright, the crystal is broken.

The common method is to make an oscillation circuit and connect the measured crystal to see if it vibrates. If the vibration starts, the crystal is good, otherwise it is bad. A commonly used circuit is shown in the figure: the measured crystal and FET VT form an oscillator., If the crystal oscillator is good, the oscillator starts to vibrate, the signal is coupled to VD1 through C1, VD2 is rectified and C2 is filtered, and then amplified by a composite amplifier circuit to drive the LED to emit light. If the transistor is damaged, the oscillator cannot start to vibrate and the LED cannot emit light. The inductor L is used to prevent the oscillation signal from passing through and can only pass through direct current. where LL represents the tested crystal.

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