它通常出现在射频，叶片通过频率和整流子刷频率，其高次谐波。
It usually appears at the RF, blade passage frequency and commutator brush frequency, and their higher harmonics.
通常，外部混频器选项增加了如下两个特征，使得谐波混频器能够代替现有微波射频输入。
In general, the external mixer option adds two features that enable substitution of the harmonic mixer for the existing microwave r.
材料与方法：应用自然组织谐波成像，对行集束电极射频治疗的30例肝癌患者42个肿块治疗前后1周瘤体的形态学变化进行观察。
Materials and Methods: NTHI was used to observe the morphological changes of 42 lesions in 30 patients with liver cancers before and 1 week after cluster electrode radio frequency ablation.
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