1. Oscilloscope detection.If you know how to use an oscilloscope, you should know.... I don't know.(Before there are also encountered that oscilloscope detection is not true, but the monomer crystal vibration test on the vibration.In this case, the crystal resistance may be high, or the crystal load does not match the capacitance values at both ends.
2. Multimeter detection.A multimeter can be used to detect whether the voltage at either end of the crystal oscillator is half the operating voltage of the chip.If it's half, that means it's oscillating.In addition, with tweezers touch the other leg of the crystal oscillator, the obvious change in voltage also means that the crystal oscillator is vibrating.