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An oscilloscope is used to display the characteristic of a diode by applying the diode current to the vertical channel and the diode voltage to the horizontal. This requires

  • A.the X-Y mode with the time base switched off
  • B.the fastest available sweep speed so that the whole curve is traced
  • C.the chop mode
  • D.an external trigger taken from the supply feeding the diode

Answer: A

Plotting one quantity against another is exactly what X-Y mode provides, the horizontal plates being driven by the second signal instead of by the sawtooth. A current sensing resistor converts the current into the voltage the vertical channel needs.

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