Vibration of a crystal unit is actually mechanical vibration. However ,the crystal unit can be expressed by a two-terminal network if its behavior is electrically converted. The series circuit consisting of L1, C1,and R1 is related to elastic vibration ,while the element C0 connected in parallel to the series arm as a capacitance attributable to the dielectric body of a quartz crystal plate .The resistance R1 is a resonance resistance of the crystal unit at the series resonance frequency. (See Fig.1.)

石英晶体谐振器的振动实质上是一种机械振动。实际上，石英晶体谐振器可以被一个具有电子转换性能的两端网络测出。这个回路包括 L1 、 C1 ，同时 C0 作为一个石英晶体的绝缘体的电容被并入回路，与弹性振动有关的阻抗 R1 是在谐振频率时石英晶体谐振器的谐振阻抗。