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Subelement 3

Measurements

Section 3-04

crystal calibrator, marking generator, frequency counter

What does a frequency counter do?

  • It measures frequency deviation
  • Correct Answer
    It makes frequency measurements
  • It generates broad-band white noise for calibration
  • It produces a reference frequency
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What factors limit the accuracy, frequency response and stability of a frequency counter?

  • Time base accuracy, temperature coefficient of the logic and time base stability
  • Number of digits in the readout, speed of the logic, and time base stability
  • Number of digits in the readout, external frequency reference and temperature coefficient of the logic
  • Correct Answer
    Time base accuracy, speed of the logic, and time base stability
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How can the accuracy of a frequency counter be improved?

  • By using slower digital logic
  • By using faster digital logic
  • By improving the accuracy of the frequency response
  • Correct Answer
    By increasing the accuracy of the time base
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If a frequency counter with a time base accuracy of +/- 0.1 PPM reads 146 520 000 Hz, what is the most that the actual frequency being measured could differ from that reading? "PPM = parts per million"

  • 0.1 MHz
  • 1.4652 Hz
  • 1.4652 kHz
  • Correct Answer
    14.652 Hz
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If a frequency counter, with a time base accuracy of 10 PPM reads 146 520 000 Hz, what is the most the actual frequency being measured could differ from that reading? "PPM = parts per million"

  • Correct Answer
    1465.2 Hz
  • 146.52 Hz
  • 146.52 kHz
  • 1465.2 kHz
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The clock in a frequency counter normally uses a:

  • Correct Answer
    crystal oscillator
  • self-oscillating Hartley oscillator
  • mechanical tuning fork
  • free-running multivibrator
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The frequency accuracy of a frequency counter is determined by:

  • the size of the frequency counter
  • type of display used in the counter
  • Correct Answer
    the characteristics of the internal timebase generator
  • the number of digits displayed
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