Multimeter Measurement Case ----- Crystal Test by Multimeter

Multimeter Measurement Crystal, Crystal Test By Multimeter Keywords: multimeter measuring crystal Multimeter measuring crystal Tip: How to measure whether the crystal is oscillating in the case of the oscilloscope? Can measure whether the two pin voltage of the crystal in the multimeter is half of the chip operating voltage, such as the operating voltage is 5V, whether it is about 2.5V. In addition, if the plurality of tweezers have a significant change, this voltage has a significant change, proves that it is the same. Trick: It is a 1.5V battery to pick up the crystal in the ear to listen carefully in the ear. When you hear the sound, you will explain it, it is good! 1. Electrical resistance method The meter of the R × 10K gear, measuring the resistance value between the two-pin pin of the quartz crystal should be infinite. If the measured resistance value is not infinite or even near zero, it will illustrate the transitive crystal leakage or breakdown. This approach can only measure whether the crystal is leaking. If there is a disconnection in the crystal, the resistance method can be unable to force. At this time, the method 2 described below must be used. The homemade tester is used as shown in the figure, welcoming a simple quartz crystal tester, The crystal can be accurately tested. In the figure, XS1, XS2 two test sockets can be removed from the small seven-foot or small nine-footed electronic pipe holder. LED luminous tube selects high brightness. When the quartz crystal is detected, the two pins of the quartz crystals are inserted into the XS1 and XS2 two sockets, and the switch SB is pressed, if the quartz crystal is good, the oscillating circuit consisting of translucent components of the transistors VT1, C1, C2 is produced. The volatile, the oscillating signal is coupled to the VD2 detection by C3. The detected DC signal voltage causes VT2, so that the LEDs in the VT2 collector circuit are luminated, indicating that the quartz crystal is good, if the LED is not bright, then explain The quartz crystals are bad. The test is tested that the frequency of quartz crystals is very wide, but the best operating frequency is a few hundred tens of Method to dozens of MHz.

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