Contour modulation is a technique in which a phase-modulated signal waveform and amplifier output impedance work together to maintain higher efficiency over a sizable output power back-off.
The basic principle of eddy current testing is introduced and the coil impedance responses due to the variations of the probe coil lift-off are analyzed and studied.
简要介绍了涡流检测的基本原理和涡流探头的特性； 分析和研究了涡流检测探头提离变化对阻抗的影响；
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For the arc resistance is nonlinear and high, the conventional feeder protections, such as impedance protection and current protection, maybe fail to trip off.