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Subelement 3

Measurements

Section 3-05

oscilloscope

If a 100 Hz signal is fed to the horizontal input of an oscilloscope and a 150 Hz signal is fed to the vertical input, what type of pattern should be displayed on the screen?

  • A rectangular pattern 100 mm wide and 150 mm high
  • Correct Answer
    A looping pattern with 3 horizontal loops, and 2 vertical loops
  • An oval pattern 100 mm wide and 150 mm high
  • A looping pattern with 100 horizontal loops and 150 vertical loops
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What factors limit the accuracy, frequency response and stability of an oscilloscope?

  • Deflection amplifier output impedance and tube face frequency increments
  • Correct Answer
    Accuracy of the time base and the linearity and bandwidth of the deflection amplifiers
  • Accuracy and linearity of the time base and tube face voltage increments
  • Tube face voltage increments and deflection amplifier voltages
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How can the frequency response of an oscilloscope be improved?

  • By using a crystal oscillator as the time base and increasing the vertical sweep rate
  • Correct Answer
    By increasing the horizontal sweep rate and the vertical amplifier frequency response
  • By increasing the vertical sweep rate and the horizontal amplifier frequency response
  • By using triggered sweep and a crystal oscillator for the timebase
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You can use an oscilloscope to display the input and output of a circuit at the same time by:

  • measuring the input on the X axis and the output on the Y axis
  • measuring the input on the X axis and the output on the Z axis
  • Correct Answer
    utilizing a dual trace oscilloscope
  • measuring the input on the Y axis and the output on the X axis
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An oscilloscope cannot be used to:

  • measure frequency
  • measure DC voltage
  • Correct Answer
    determine FM carrier deviation
  • determine the amplitude of complex voltage wave forms
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The bandwidth of an oscilloscope is:

  • directly related to gain compression
  • indirectly related to screen persistence
  • Correct Answer
    the highest frequency signal the scope can display
  • a function of the time-base accuracy
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When using Lissajous figures to determine phase differences, an indication of zero or 180 degrees is represented on the screen of an oscilloscope by:

  • a horizontal straight line
  • an ellipse
  • Correct Answer
    a diagonal straight line
  • a circle
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A 100-kHz signal is applied to the horizontal channel of an oscilloscope. A signal of unknown frequency is applied to the vertical channel. The resultant wave form has 5 loops displayed vertically and 2 loops horizontally. The unknown frequency is:

  • 20 kHz
  • 50 kHz
  • Correct Answer
    40 kHz
  • 30 kHz
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What item of test equipment contains horizontal and vertical channel amplifiers?

  • A signal generator
  • Correct Answer
    An oscilloscope
  • An ammeter
  • An ohmmeter
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What is the best instrument to use to check the signal quality of a CW or single-sideband phone transmitter?

  • A sidetone monitor
  • Correct Answer
    An oscilloscope
  • A signal tracer and an audio amplifier
  • A field-strength meter
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What signal source is connected to the vertical input of an oscilloscope when checking the quality of a transmitted signal?

  • Correct Answer
    the RF signals of a nearby receiving antenna
  • the IF output of a monitoring receiver
  • the audio input of the transmitter
  • the RF output of the transmitter
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