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The Z axis input of an oscilloscope allows an external signal to control

  • A.the horizontal position of the trace on the screen
  • B.the vertical gain of the input amplifier
  • C.the speed at which the time base sweeps
  • D.the brightness of the trace

Answer: D

It is connected to the control grid circuit, so an external waveform can brighten or blank the beam. Marking a trace with timing pips from a standard frequency source is the classic use, and it also serves for intensity modulation in raster displays.

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