英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • What is the difference between the terms wave, waveform, and signal?
    A waveform is a representation of physical quantity such as voltage or a current over time If this physical quantity carries information then it is a signal In practice, however, the terms signal and waveform are often used synonymously
  • waveform - Peak and RMS voltage for a sine wave - Electrical . . .
    As Peter says the integral looks like a constant plus a sinusoidal waveform (at twice the frequency) Which makes sense if you think about what the power looks like as the voltage changes- it's always positive, hence there must be an offset, and touches zero at the zero crossings
  • What exactly are harmonics and how do they appear?
    This is called Fourier analysis (if the original waveform is repeating) or Fourier transform (for any waveform) In case of a repeating waveform (like a square wave), when you do Fourier analysis you find that all the sines that compose the waveform have frequencies that are an integer multiple of the frequency of the original waveform
  • rf - What are the waveforms of radio frequencies? - Electrical . . .
    What is the waveform of radio frequencies? I thought they were sinusoidal; am I wrong? I started to wonder about radio frequency waves at the time (two years ago), if they were digital, because all systems are digital, but the problem was that radios were being used in World Wars I and II, and even before At that time, electronic devices were
  • impedance - 50 Ω or high-Z setting on waveform generator? - Electrical . . .
    I have an arbitrary waveform generator that allows me to set the load as 50 Ω or high-Z This generator is connected to an amplifier that has as input an unbalanced BNC connector, 10 kΩ, single-ended I need to measure the signal I am sending to this amplifier My oscilloscope has the classical internal settings for 50 Ω and 1 MΩ
  • What Does 8 x 20-µs and 10 x 1000-µs Mean in Surge Testing Terminology
    standardized transient impulses (or sometimes it's called a waveform) But what does it actually mean Why is there a multiplier in front of the time unit? The quoted line above is constantly mentioned in surge testing document But no where in the document does it mention what is the meaning of it Most Google search results point to Datasheet
  • waveform - How to generate an impulse response in practical way . . .
    However it can be approximated with a narrow pulse The accuracy of the approximation depends on the bandwidth of the circuit you want to analyze with the impulse A reasonable rule of thumb is that the bandwidth of your circuit should be much less (say 1 10) than the reciprocal of your approximate impulse waveform
  • Sources of Harmonics (Odd and Even)
    The question of "sources of harmonics" is sort of a chicken and egg question You can generate a waveform by combining harmonics, or you can generate harmonics by producing a waveform Usually, the second meaning is what is used The harmonics are generated by whatever process created the waveform
  • What does Ethernet 100BASE-T signal look like?
    100BASE-TX, the most common 100BASE in use today (and what's likely being used in your setup), uses a PAM-type variant called MLT-3 Below is a typical MLT-3 waveform Power over Ethernet (PoE) Power over Ethernet (PoE) injects a DC bias of about 48V onto the signal pairs to carry power to the far-end device
  • waveform - Equation for the average power of a signal - Electrical . . .
    I'm reading the book "Introduction to Electromagnetic Compatibility" by CR Paul, and in Chapter 3, I come across this equation for the average power in the waveform assuming a 50% duty cycle and \$\tau_r\$ = \$\tau_f\$ :





中文字典-英文字典  2005-2009