What is the purpose of using a prescaler with a frequency counter?
The correct answer is D: Reduce the signal frequency to within the counter's operating range. What is the purpose of using a prescaler with a frequency counter is to reduce the signal frequency to within the counter's operating range. Prescalers divide frequency to extend counter range. For amateur radio operators, this is important for test equipment. Understanding this helps when using frequency counters.
Exam Tip
Prescaler purpose = reduce signal frequency to within counter's operating range. Think 'P'rescaler = 'P'reserves counter range by 'D'ividing. Prescalers divide frequency to extend counter range. Not amplify, not multiply, not prevent oscillation - just reduce frequency.
Memory Aid
"Prescaler purpose = reduce signal frequency to within counter's operating range. Think 'P'rescaler = 'D'ivide frequency. Prescalers divide frequency to extend counter range. Important for test equipment."
Real-World Application
Using a prescaler with a frequency counter: Its purpose is to reduce the signal frequency to within the counter's operating range. For example, a 10:1 prescaler divides a 1 GHz signal to 100 MHz, which a counter can measure. This is the purpose - reduce frequency to within counter range.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Amplify low-level signals isn't the purpose - prescalers divide frequency, not amplify. Amplification isn't the purpose.
Option B: Incorrect. Multiply higher frequency signal isn't the purpose - prescalers divide frequency, not multiply. Multiplication isn't the purpose.
Option C: Incorrect. Prevent oscillation isn't the purpose - prescalers divide frequency to extend range. Preventing oscillation isn't the purpose.
题目解析
The correct answer is D: Reduce the signal frequency to within the counter's operating range. What is the purpose of using a prescaler with a frequency counter is to reduce the signal frequency to within the counter's operating range. Prescalers divide frequency to extend counter range. For amateur radio operators, this is important for test equipment. Understanding this helps when using frequency counters.
考试技巧
Prescaler purpose = reduce signal frequency to within counter's operating range. Think 'P'rescaler = 'P'reserves counter range by 'D'ividing. Prescalers divide frequency to extend counter range. Not amplify, not multiply, not prevent oscillation - just reduce frequency.
记忆口诀
Prescaler purpose = reduce signal frequency to within counter's operating range. Think 'P'rescaler = 'D'ivide frequency. Prescalers divide frequency to extend counter range. Important for test equipment.
实际应用示例
Using a prescaler with a frequency counter: Its purpose is to reduce the signal frequency to within the counter's operating range. For example, a 10:1 prescaler divides a 1 GHz signal to 100 MHz, which a counter can measure. This is the purpose - reduce frequency to within counter range.
错误选项分析
Option A: Incorrect. Amplify low-level signals isn't the purpose - prescalers divide frequency, not amplify. Amplification isn't the purpose. Option B: Incorrect. Multiply higher frequency signal isn't the purpose - prescalers divide frequency, not multiply. Multiplication isn't the purpose. Option C: Incorrect. Prevent oscillation isn't the purpose - prescalers divide frequency to extend range. Preventing oscillation isn't the purpose.
知识点
Prescaler, Frequency counter, Reduce signal frequency, Operating range
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.