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logseq/bak/pages/E4A/2025-05-01T20_36_29.889Z.Desktop.md
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E4A Test equipment: analog and digital instruments; spectrum analyzers; antenna analyzers; oscilloscopes; RF measurements
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- [[E4A01]] (A)
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Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?
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- [[A.]] Sampling rate of the analog-to-digital converter
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- [[B.]] Analog-to-digital converter reference frequency
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- [[C.]] Q of the circuit
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- [[D.]] All these choices are correct
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--
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- [[E4A02]] (B)
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Which of the following parameters does a spectrum analyzer display on the vertical and horizontal axes?
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- [[A.]] Signal amplitude and time
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- [[B.]] Signal amplitude and frequency
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- [[C.]] SWR and frequency
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- [[D.]] SWR and time
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--
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- [[E4A03]] (B)
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Which of the following test instruments is used to display spurious signals and/or intermodulation distortion products generated by an SSB transmitter?
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- [[A.]] Differential resolver
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- [[B.]] Spectrum analyzer
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- [[C.]] Logic analyzer
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- [[D.]] Network analyzer
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--
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- [[E4A04]] (A)
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How is compensation of an oscilloscope probe performed?
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- [[A.]] A square wave is displayed, and the probe is adjusted until the horizontal portions of the displayed wave are as nearly flat as possible
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- [[B.]] A high frequency sine wave is displayed, and the probe is adjusted for maximum amplitude
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- [[C.]] A frequency standard is displayed, and the probe is adjusted until the deflection time is accurate
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- [[D.]] A DC voltage standard is displayed, and the probe is adjusted until the displayed voltage is accurate
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--
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- [[E4A05]] (D)
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What is the purpose of using a prescaler with a frequency counter?
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- [[A.]] Amplify low-level signals for more accurate counting
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- [[B.]] Multiply a higher frequency signal so a low-frequency counter can display the operating frequency
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- [[C.]] Prevent oscillation in a low-frequency counter circuit
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- [[D.]] Reduce the signal frequency to within the counter's operating range
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--
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- [[E4A06]] (A)
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What is the effect of aliasing on a digital oscilloscope when displaying a waveform?
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- [[A.]] A false, jittery low-frequency version of the waveform is displayed
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- [[B.]] The waveform DC offset will be inaccurate
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- [[C.]] Calibration of the vertical scale is no longer valid
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- [[D.]] Excessive blanking occurs, which prevents display of the waveform
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--
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- [[E4A07]] (B)
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Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge?
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- [[A.]] Antenna analyzers automatically tune your antenna for resonance
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- [[B.]] Antenna analyzers compute SWR and impedance automatically
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- [[C.]] Antenna analyzers display a time-varying representation of the modulation envelope
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- [[D.]] All these choices are correct
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--
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- [[E4A08]] (D)
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Which of the following is used to measure SWR?
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- [[A.]] Directional wattmeter
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- [[B.]] Vector network analyzer
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- [[C.]] Antenna analyzer
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- [[D.]] All these choices are correct
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--
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- [[E4A09]] (A)
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Which of the following is good practice when using an oscilloscope probe?
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- [[A.]] Minimize the length of the probe's ground connection
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- [[B.]] Never use a high-impedance probe to measure a low-impedance circuit
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- [[C.]] Never use a DC-coupled probe to measure an AC circuit
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- [[D.]] All these choices are correct
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--
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- [[E4A10]] (D)
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Which trigger mode is most effective when using an oscilloscope to measure a linear power supply’s output ripple?
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- [[A.]] Single-shot
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- [[B.]] Edge
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- [[C.]] Level
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- [[D.]] Line
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--
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- [[E4A11]] (D)
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Which of the following can be measured with an antenna analyzer?
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- [[A.]] Velocity factor
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- [[B.]] Cable length
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- [[C.]] Resonant frequency of a tuned circuit
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- [[D.]] All these choices are correct
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78
logseq/bak/pages/E4A/2025-05-01T20_36_51.623Z.Desktop.md
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78
logseq/bak/pages/E4A/2025-05-01T20_36_51.623Z.Desktop.md
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E4A Test equipment: analog and digital instruments; spectrum analyzers; antenna analyzers; oscilloscopes; RF measurements
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- [[E4A01]] (A)
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Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope? #card
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- [[A.]] Sampling rate of the analog-to-digital converter
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- [[B.]] Analog-to-digital converter reference frequency
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- [[C.]] Q of the circuit
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- [[D.]] All these choices are correct
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--
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- [[E4A02]] (B)
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Which of the following parameters does a spectrum analyzer display on the vertical and horizontal axes? #card
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- [[A.]] Signal amplitude and time
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- [[B.]] Signal amplitude and frequency
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- [[C.]] SWR and frequency
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- [[D.]] SWR and time
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--
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- [[E4A03]] (B)
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Which of the following test instruments is used to display spurious signals and/or intermodulation distortion products generated by an SSB transmitter? #card
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- [[A.]] Differential resolver
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- [[B.]] Spectrum analyzer
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- [[C.]] Logic analyzer
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- [[D.]] Network analyzer
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--
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- [[E4A04]] (A)
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How is compensation of an oscilloscope probe performed? #card
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- [[A.]] A square wave is displayed, and the probe is adjusted until the horizontal portions of the displayed wave are as nearly flat as possible
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- [[B.]] A high frequency sine wave is displayed, and the probe is adjusted for maximum amplitude
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- [[C.]] A frequency standard is displayed, and the probe is adjusted until the deflection time is accurate
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- [[D.]] A DC voltage standard is displayed, and the probe is adjusted until the displayed voltage is accurate
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--
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- [[E4A05]] (D)
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What is the purpose of using a prescaler with a frequency counter? #card
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- [[A.]] Amplify low-level signals for more accurate counting
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- [[B.]] Multiply a higher frequency signal so a low-frequency counter can display the operating frequency
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- [[C.]] Prevent oscillation in a low-frequency counter circuit
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- [[D.]] Reduce the signal frequency to within the counter's operating range
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--
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- [[E4A06]] (A)
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What is the effect of aliasing on a digital oscilloscope when displaying a waveform? #card
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- [[A.]] A false, jittery low-frequency version of the waveform is displayed
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- [[B.]] The waveform DC offset will be inaccurate
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- [[C.]] Calibration of the vertical scale is no longer valid
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- [[D.]] Excessive blanking occurs, which prevents display of the waveform
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--
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- [[E4A07]] (B)
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Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge? #card
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- [[A.]] Antenna analyzers automatically tune your antenna for resonance
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- [[B.]] Antenna analyzers compute SWR and impedance automatically
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- [[C.]] Antenna analyzers display a time-varying representation of the modulation envelope
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- [[D.]] All these choices are correct
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--
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- [[E4A08]] (D)
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Which of the following is used to measure SWR? #card
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- [[A.]] Directional wattmeter
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- [[B.]] Vector network analyzer
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- [[C.]] Antenna analyzer
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- [[D.]] All these choices are correct
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--
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- [[E4A09]] (A)
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Which of the following is good practice when using an oscilloscope probe? #card
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- [[A.]] Minimize the length of the probe's ground connection
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- [[B.]] Never use a high-impedance probe to measure a low-impedance circuit
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- [[C.]] Never use a DC-coupled probe to measure an AC circuit
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- [[D.]] All these choices are correct
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--
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- [[E4A10]] (D)
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Which trigger mode is most effective when using an oscilloscope to measure a linear power supply’s output ripple? #card
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- [[A.]] Single-shot
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- [[B.]] Edge
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- [[C.]] Level
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- [[D.]] Line
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--
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- [[E4A11]] (D)
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Which of the following can be measured with an antenna analyzer? #card
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- [[A.]] Velocity factor
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- [[B.]] Cable length
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- [[C.]] Resonant frequency of a tuned circuit
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- [[D.]] All these choices are correct
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