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  • 各种谱函数的区别是什么，何时用何种函数？ - 知乎
    对时域信号进行傅立叶变换(FFT)时，可以用多种不同的函数来表示计算结果，如频谱、自谱、功率谱密度等等，并且这些函数还有不同的格式，如Peak，RMS和Peak-Peak。到底用哪个函数来表示更贴切，它们有什么区别呢？在讨论这些谱函数之前，让我们明确一下Peak，RMS和Peak-Peak的定义。
  • theory - How is quasi peak calculated - Electrical Engineering Stack . . .
    Quasi-peak means 'not quite peak' It is intended to detect peaks that exceed a certain duration in RF with pulse amplitudes using a low pass filter, defined for EMC calibration testers and used to shape spectral curves for Audio Noise The weight is served to emphasize the peaks that cause most of the nuisance noises There are other
  • RMS 电流和 Peak 电流有什么区别？ - 知乎
    知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容，聚集了中文互联网科技、商业、影视
  • Usage of peak-to-peak voltage and RMS voltage - ac
    RF carrier signal often in uV or dBuV or dBmV or in power 0dBm = 0 mW average in standard R (=75 for video, 50 ohms for most all others) These are often peak measurements in RF Rx from AGC circuit (RSSI receive signal strength indicator) and converted to dBm average power common measurements; Vp, Peak (generated) Vpp, Peak-to-Peak (without DC)
  • oscilloscope - Peak to Peak vs. Amplitude - Electrical Engineering . . .
    The peak-to-peak amplitude is defined as the difference between the largest and smallest voltages in your waveform A DC offset will not change the peak-to-peak amplitude as it affects both the largest and smallest voltages equally Amplitude is less well defined so, as I said, you should consult the manual for the definition
  • 测量时钟时Period Jitter、Cycle-Cycle 与 TIE这三种方式该如何选择？ - 知乎
    Peak-to-Peak抖动 - 可用于表征确定性（有界）和随机（无界）抖动分量，另外必须在给定的BER下引用或考虑随机（无界）抖动。 视频资源加载失败 示波器直方图-抖动测试
  • Mathematical relation of RMS to PK-PK for noise
    \$\begingroup\$ @scot123, Take a look at my image "Time Domain - White noise" 6 6 standard deviations (+3 3 standard deviations - 3 3 standard deviations) covers 99 9% of the signal peak to peak Therefore 100µVRMS, for example, equal to 660µVpp When you will make calculations on noise, you'll use RMS values, but it's useful to know what your RMS value is worth in peak-peak terms
  • Interpreting an EMC radiated emission test result
    The peak is the highest value measured whereas the average is the value averaged over time Depending on what standard you are testing to determines which is significant For CISPR22 it would be quasi peak Upon looking at the report closer, it notes that the standard used is CISPR16 and the peak is ‘Q peak’ aka quasi peak Another EMC skill is knowing and understanding the various standards
  • detector - EMC Radiated Emissions, peak vs quasi-peak - Electrical . . .
    The characteristic at very low frequencies (~Hz) is not defined, and would depend on the display mode (peak hold or average), or again would be seen to fluctuate between acquisitions The detector reads magnitude within the receiver bandwidth (RBW), so reads AM directly, or FM by slope detection when the modulating signal is within RBW and some of the signal spreads outside the RBW
  • 炭材料的拉曼图中得出D G的大小能说明什么？ - 知乎
    D peak Raman scattering 是需要defects 才能完成。G peak Raman scattering 是碳原子in-plain vibration mode E2g。2D peak Raman scattering 是D peak 的overtone，但是不需要defect就能完成。我们一般看graphene的Raman spectrum 主要就看这三个。大多数情况下，（不包括所有情况），可以看I(2D) I(G)是





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