Whatever it is radar, eccm equipment, communication equipment or instrument, frequency source with high stability is needed to guarantee the quality of carrier signal.

无论是雷达、电子对抗，还是通信、仪器设备等都需要高稳定度的频率源，以保证载波信号的质量。

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At last, an intelligentized testing instrument for electric wire high frequency carrier wave channels is developed.

在此基础上，研制开发出了一套智能化电力线高频载波通道测试装置。

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Ultrashort wave Electrotherapy Machine is an instrument which utilizes high frequency electric energy of ultrashort wave to act on human's organism for treatment.

简介超短波电疗机是利用超短波的高频电能作用于人的肌体进行治疗的仪器。

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It can use its High Frequency Instrument to look for the infrared emission from dust that is warmed by stars associated with far-off galaxies.

BBC: Science & Environment