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• Impedance matching
  ...resistance (symbol: ''R''; a [[real number]]) and the reactance (symbol: ''X''; an [[imaginary number]]). ...h the matching network was designed, reflections (in this narrow frequency band only) are also minimized. For the case of purely resistive source and load
  31 KB (4,821 words) - 14:50, 10 December 2011
• Lock-in amplifier
  ...on|homodyne]] with an extremely [[low pass filter]] (making it very narrow band). Lock-in amplifiers use mixing, through a [[frequency mixer]], to convert ...esent the signal as a vector relative to the lock-in reference oscillator. X is called the 'in-phase' component and Y the 'quadrature' component. By com
  11 KB (1,574 words) - 14:51, 10 December 2011
• Frequency synthesizer
  ...ore frequencies or [[channel (communications)|channels]] over a much wider band. A large number of crystals increases cost and requires greater space. ...this to be the case, the VCO must run at a frequency which is 100 kHz x the divider count value. Thus it will produce an output of 100 kHz for
  14 KB (1,974 words) - 14:51, 10 December 2011
• Spectrometer
  ...t operate over a very wide range of wavelengths, from [[gamma ray]]s and [[X-ray]]s into the [[far infrared]]. If the instrument is designed to measure ...or example, the element [[sodium]] has a very characteristic double yellow band known as the Sodium D-lines at 588.9950 and 589.5924 nanometers, the color
  11 KB (1,486 words) - 14:51, 10 December 2011
• Test probe
  ...nce)'' probes or ''10×'' probes, often printed with the letter ''X'' or ''x'' instead of the multiplication sign, and usually spoken of as "a times-ten ...nents. These signals are combined in the amplifier circuit to yield a wide band signal extending from DC to over 50 MHz. {{Harv|Wedlock|Roberge|1969|p
  27 KB (4,130 words) - 14:52, 10 December 2011
• Spectrum analyzer
  ...cillator]] and a [[Frequency mixer|mixer]]) to the center frequency of a [[band-pass filter]]. With a superheterodyne architecture, the [[voltage-controlle ...ts]] a portion of the input signal spectrum to the center frequency of a [[band-pass filter]] by sweeping the [[voltage-controlled oscillator]] through a
  20 KB (2,944 words) - 14:52, 10 December 2011
• Radio-frequency sweep
  ...e frequency of the receiver is changed to scan (sweep) a desired frequency band, a display indicates the power of the signals received at each frequency. ...and a display. The display presents measured power (y axis) vs frequency (x axis).
  3 KB (390 words) - 14:52, 10 December 2011

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