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A 10:1 attenuator probe is used with an oscilloscope chiefly to

  • A.provide isolation between the circuit and the instrument earth
  • B.reduce the loading the instrument places on the circuit
  • C.increase the sensitivity of the instrument by a factor of ten
  • D.extend the bandwidth of the vertical amplifier tenfold

Answer: B

The series resistance in the probe raises the input impedance tenfold and reduces the effective input capacitance, so a high impedance circuit is disturbed far less. The price is a tenfold loss of signal, which must be allowed for in reading the screen.

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