They measured the radio frequency instead of optical frequency measurement with optical frequency comb and technology of octave-spanning.
利用光频梳和倍频技术，把对光频的测量变为对射频的测量，这样就能够很容易地测出光的频率。
Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test.
电磁兼容性(emc)。第4 - 3部分：试验和测量技术。辐射、射频和电磁场抗干扰试验。
The vector network analyzer is the special instrument that tests microwave and radio frequency devices, its application is very extensive in the wireless measurement field.
矢量网络分析仪是测试微波射频器件的专用仪器，在无线电测试领域应用非常广泛。
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