What three test loads are used to calibrate an RF vector network analyzer?
The correct answer is B: Short circuit, open circuit, and 50 ohms. What three test loads are used to calibrate an RF vector network analyzer is short circuit, open circuit, and 50 ohms. These three loads are used for VNA calibration. For amateur radio operators, this is important for test equipment. Understanding this helps when calibrating network analyzers.
Exam Tip
VNA calibration loads = short circuit, open circuit, and 50 ohms. Think 'V'NA 'C'alibration = 'S'hort, 'O'pen, '5'0 ohms. These three loads are used for VNA calibration. Not 75/90 ohms, not resonant circuit, not cable lengths - just short, open, 50 ohms.
Memory Aid
"VNA calibration loads = short circuit, open circuit, and 50 ohms. Think 'V'NA 'C'alibration = 'S'hort, 'O'pen, '5'0 ohms. These three loads are used for VNA calibration. Important for test equipment."
Real-World Application
Calibrating an RF vector network analyzer: Three test loads are used - short circuit, open circuit, and 50 ohms. These three known impedances allow the VNA to calibrate its measurements. This is the calibration method - short, open, and 50 ohms.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 50, 75, and 90 ohms isn't correct - VNA calibration uses short, open, and 50 ohms. 75/90 ohms isn't used.
Option C: Incorrect. Short, open, and resonant circuit isn't correct - VNA calibration uses short, open, and 50 ohms. Resonant circuit isn't used.
Option D: Incorrect. 50 ohms through different cable lengths isn't correct - VNA calibration uses short, open, and 50 ohms. Cable lengths isn't the method.
题目解析
The correct answer is B: Short circuit, open circuit, and 50 ohms. What three test loads are used to calibrate an RF vector network analyzer is short circuit, open circuit, and 50 ohms. These three loads are used for VNA calibration. For amateur radio operators, this is important for test equipment. Understanding this helps when calibrating network analyzers.
考试技巧
VNA calibration loads = short circuit, open circuit, and 50 ohms. Think 'V'NA 'C'alibration = 'S'hort, 'O'pen, '5'0 ohms. These three loads are used for VNA calibration. Not 75/90 ohms, not resonant circuit, not cable lengths - just short, open, 50 ohms.
记忆口诀
VNA calibration loads = short circuit, open circuit, and 50 ohms. Think 'V'NA 'C'alibration = 'S'hort, 'O'pen, '5'0 ohms. These three loads are used for VNA calibration. Important for test equipment.
实际应用示例
Calibrating an RF vector network analyzer: Three test loads are used - short circuit, open circuit, and 50 ohms. These three known impedances allow the VNA to calibrate its measurements. This is the calibration method - short, open, and 50 ohms.
错误选项分析
Option A: Incorrect. 50, 75, and 90 ohms isn't correct - VNA calibration uses short, open, and 50 ohms. 75/90 ohms isn't used. Option C: Incorrect. Short, open, and resonant circuit isn't correct - VNA calibration uses short, open, and 50 ohms. Resonant circuit isn't used. Option D: Incorrect. 50 ohms through different cable lengths isn't correct - VNA calibration uses short, open, and 50 ohms. Cable lengths isn't the method.
知识点
RF vector network analyzer, Calibration, Short circuit, Open circuit, 50 ohms
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.