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Extra-Study/pages/E4B.md
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2025-05-01 15:49:18 -05:00

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E4B Measurement technique and limitations: instrument accuracy and performance limitations; probes; techniques to minimize errors; measurement of Q; instrument calibration; S parameters; vector network analyzers; RF signals

  • E4B01 (B) Which of the following factors most affects the accuracy of a frequency counter? #card
    • A. Input attenuator accuracy
    • B. Time base accuracy
    • C. Decade divider accuracy
    • D. Temperature coefficient of the logic
  • E4B02 (A) What is the significance of voltmeter sensitivity expressed in ohms per volt? #card
    • A. The full scale reading of the voltmeter multiplied by its ohms per volt rating is the input impedance of the voltmeter
    • B. The reading in volts multiplied by the ohms per volt rating will determine the power drawn by the device under test
    • C. The reading in ohms divided by the ohms per volt rating will determine the voltage applied to the circuit
    • D. The full scale reading in amps divided by ohms per volt rating will determine the size of shunt needed
  • E4B03 (C) Which S parameter is equivalent to forward gain? #card
  • E4B04 (A) Which S parameter represents input port return loss or reflection coefficient (equivalent to VSWR)? #card
  • E4B05 (B) What three test loads are used to calibrate an RF vector network analyzer? #card
    • A. 50 ohms, 75 ohms, and 90 ohms
    • B. Short circuit, open circuit, and 50 ohms
    • C. Short circuit, open circuit, and resonant circuit
    • D. 50 ohms through 1/8 wavelength, 1/4 wavelength, and 1/2 wavelength of coaxial cable
  • E4B06 (D) How much power is being absorbed by the load when a directional power meter connected between a transmitter and a terminating load reads 100 watts forward power and 25 watts reflected power? #card
    • A. 100 watts
    • B. 125 watts
    • C. 112.5 watts
    • D. 75 watts
  • E4B07 (A) What do the subscripts of S parameters represent? #card
    • A. The port or ports at which measurements are made
    • B. The relative time between measurements
    • C. Relative quality of the data
    • D. Frequency order of the measurements
  • E4B08 (C) Which of the following can be used to determine the Q of a series-tuned circuit? #card
    • A. The ratio of inductive reactance to capacitive reactance
    • B. The frequency shift
    • C. The bandwidth of the circuit's frequency response
    • D. The resonant frequency of the circuit
  • E4B09 (B) Which of the following can be measured by a two-port vector network analyzer? #card
    • A. Phase noise
    • B. Filter frequency response
    • C. Pulse rise time
    • D. Forward power
  • E4B10 (B) Which of the following methods measures intermodulation distortion in an SSB transmitter? #card
    • A. Modulate the transmitter using two RF signals having non-harmonically related frequencies and observe the RF output with a spectrum analyzer
    • B. Modulate the transmitter using two AF signals having non-harmonically related frequencies and observe the RF output with a spectrum analyzer
    • C. Modulate the transmitter using two AF signals having harmonically related frequencies and observe the RF output with a peak reading wattmeter
    • D. Modulate the transmitter using two RF signals having harmonically related frequencies and observe the RF output with a logic analyzer
  • E4B11 (D) Which of the following can be measured with a vector network analyzer? #card
    • A. Input impedance
    • B. Output impedance
    • C. Reflection coefficient
    • D. All these choices are correct