Which of the following factors most affects the accuracy of a frequency counter?
The correct answer is B: Time base accuracy. Which of the following factors most affects the accuracy of a frequency counter is time base accuracy. The time base (reference oscillator) determines frequency counter accuracy. For amateur radio operators, this is important for test equipment. Understanding this helps when using frequency counters.
Exam Tip
Frequency counter accuracy most affected by = time base accuracy. Think 'F'requency 'C'ounter 'A'ccuracy = 'T'ime 'B'ase 'A'ccuracy. The time base (reference oscillator) determines frequency counter accuracy. Not attenuator, not divider, not temperature - just time base.
Memory Aid
"Frequency counter accuracy most affected by = time base accuracy. Think 'F'requency 'C'ounter = 'T'ime 'B'ase. The time base (reference oscillator) determines frequency counter accuracy. Important for test equipment."
Real-World Application
A frequency counter: Its accuracy is most affected by time base accuracy. The time base is the reference oscillator used for counting. If the time base is inaccurate, all frequency measurements will be inaccurate. This is the factor - time base accuracy most affects counter accuracy.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Input attenuator accuracy doesn't most affect accuracy - time base accuracy does. Attenuator isn't the most important.
Option C: Incorrect. Decade divider accuracy doesn't most affect accuracy - time base accuracy does. Divider isn't the most important.
Option D: Incorrect. Temperature coefficient of logic doesn't most affect accuracy - time base accuracy does. Temperature coefficient isn't the most important.
题目解析
The correct answer is B: Time base accuracy. Which of the following factors most affects the accuracy of a frequency counter is time base accuracy. The time base (reference oscillator) determines frequency counter accuracy. For amateur radio operators, this is important for test equipment. Understanding this helps when using frequency counters.
考试技巧
Frequency counter accuracy most affected by = time base accuracy. Think 'F'requency 'C'ounter 'A'ccuracy = 'T'ime 'B'ase 'A'ccuracy. The time base (reference oscillator) determines frequency counter accuracy. Not attenuator, not divider, not temperature - just time base.
记忆口诀
Frequency counter accuracy most affected by = time base accuracy. Think 'F'requency 'C'ounter = 'T'ime 'B'ase. The time base (reference oscillator) determines frequency counter accuracy. Important for test equipment.
实际应用示例
A frequency counter: Its accuracy is most affected by time base accuracy. The time base is the reference oscillator used for counting. If the time base is inaccurate, all frequency measurements will be inaccurate. This is the factor - time base accuracy most affects counter accuracy.
错误选项分析
Option A: Incorrect. Input attenuator accuracy doesn't most affect accuracy - time base accuracy does. Attenuator isn't the most important. Option C: Incorrect. Decade divider accuracy doesn't most affect accuracy - time base accuracy does. Divider isn't the most important. Option D: Incorrect. Temperature coefficient of logic doesn't most affect accuracy - time base accuracy does. Temperature coefficient isn't the most important.
知识点
Frequency counter accuracy, Time base accuracy, Reference oscillator, Counter accuracy
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.