Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?
The correct answer is A: Sampling rate of the analog-to-digital converter. Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope is the sampling rate of the analog-to-digital converter. The sampling rate must be at least twice the signal frequency (Nyquist criterion). For amateur radio operators, this is important for test equipment. Understanding this helps when using oscilloscopes.
Exam Tip
Digital oscilloscope frequency limit = sampling rate of ADC. Think 'D'igital 'O'scilloscope = 'D'epends on 'O'versampling (sampling rate). The sampling rate must be at least twice the signal frequency (Nyquist criterion). Not reference frequency, not circuit Q - just sampling rate.
Memory Aid
"Digital oscilloscope frequency limit = sampling rate of ADC. Think 'D'igital 'O'scilloscope = 'S'ampling 'R'ate. The sampling rate must be at least twice the signal frequency (Nyquist criterion). Important for test equipment."
Real-World Application
A digital oscilloscope: The highest frequency signal that can be accurately displayed is limited by the sampling rate of the analog-to-digital converter. According to the Nyquist criterion, the sampling rate must be at least twice the signal frequency. This is the limit - sampling rate of the ADC.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. ADC reference frequency isn't the limiting factor - sampling rate is. Reference frequency isn't the limit.
Option C: Incorrect. Q of the circuit isn't the limiting factor - sampling rate is. Circuit Q isn't the limit.
Option D: Incorrect. Since B and C are not correct, 'all of the above' cannot be correct. Only sampling rate is the limit.
题目解析
The correct answer is A: Sampling rate of the analog-to-digital converter. Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope is the sampling rate of the analog-to-digital converter. The sampling rate must be at least twice the signal frequency (Nyquist criterion). For amateur radio operators, this is important for test equipment. Understanding this helps when using oscilloscopes.
考试技巧
Digital oscilloscope frequency limit = sampling rate of ADC. Think 'D'igital 'O'scilloscope = 'D'epends on 'O'versampling (sampling rate). The sampling rate must be at least twice the signal frequency (Nyquist criterion). Not reference frequency, not circuit Q - just sampling rate.
记忆口诀
Digital oscilloscope frequency limit = sampling rate of ADC. Think 'D'igital 'O'scilloscope = 'S'ampling 'R'ate. The sampling rate must be at least twice the signal frequency (Nyquist criterion). Important for test equipment.
实际应用示例
A digital oscilloscope: The highest frequency signal that can be accurately displayed is limited by the sampling rate of the analog-to-digital converter. According to the Nyquist criterion, the sampling rate must be at least twice the signal frequency. This is the limit - sampling rate of the ADC.
错误选项分析
Option B: Incorrect. ADC reference frequency isn't the limiting factor - sampling rate is. Reference frequency isn't the limit. Option C: Incorrect. Q of the circuit isn't the limiting factor - sampling rate is. Circuit Q isn't the limit. Option D: Incorrect. Since B and C are not correct, 'all of the above' cannot be correct. Only sampling rate is the limit.
知识点
Digital oscilloscope, Highest frequency signal, Sampling rate, Analog-to-digital converter
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.