Crystal, bad judgment ----- Rystal Tester

Keywords: crystal detection circuit Measurements for quartz crystal oscillations should generally be more than those of the instrument and its quality parameters. If you want to determine the quality of the quartz crystal, you can measure the measurement by one meter. When measuring with a multimeter, the multimeter is placed in the RX1K gear, first measuring both ends of the quartz crystal. When the normal quartz crystal is measured with a power resistance file, its resistance should be infinite, and the head pointer should not be swung. If the header pointer swings, and the resistance is small, it indicates that the quartz crystal is damaged. If it is necessary to further judgment, the measurement can be performed as shown below. The drawing line When the A and B terminals are connected to the quartz crystal, the multimeter voltage file indicates about 0.75V. When the quartz crystal is connected, the circuit should be oscillated, and the voltage is increased, and should generally be around 1.26V. If the above requirements are met, the quartz crystal can be described. If the quartz crystal is connected, the voltage indication has no change, and the quartz crystal has not been invalid and has no value. The graphical line is required to be high in the crystal triode P, in order to activate the vibration at low voltage, and the triode collector current is about 0.3 mA.

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