What does “time averaging” mean when evaluating RF radiation exposure?
The correct answer is D: The total RF exposure averaged over a certain period. What 'time averaging' means when evaluating RF radiation exposure is the total RF exposure averaged over a certain period. Time averaging accounts for the fact that exposure varies over time, so it's averaged over a specified period (typically 6 minutes for controlled, 30 minutes for uncontrolled). For amateur radio operators, this is important for RF exposure calculations. Understanding this helps ensure accurate exposure evaluation.
Exam Tip
Time averaging = total RF exposure averaged over certain period. Think 'T'ime 'A'veraging = 'T'otal 'A'veraged exposure. Time averaging accounts for varying exposure over time, averaged over specified period (6 or 30 minutes). Not 24-hour power, not time for effects, not total time - just averaged exposure.
Memory Aid
"Time averaging = total RF exposure averaged over certain period. Think 'T'ime 'A'veraging = 'T'otal 'A'veraged. Time averaging accounts for varying exposure over time, averaged over specified period. Important for RF exposure calculations."
Real-World Application
Time averaging: RF exposure varies over time (transmitter on/off, different power levels). Time averaging takes the total RF exposure and averages it over a specified period (6 minutes for controlled exposure, 30 minutes for uncontrolled exposure). This gives an average exposure level. This is what time averaging means - total RF exposure averaged over a certain period.
FCC Part 97.13, FCC OET Bulletin 65Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Time averaging isn't average power developed over 24 hours - it's total exposure averaged over a period (6 or 30 minutes), not 24 hours. 24-hour period is wrong.
Option B: Incorrect. Time averaging isn't average time for long-term effects - it's averaging exposure over time, not time for effects. Time for effects is wrong.
Option C: Incorrect. Time averaging isn't just total time of exposure - it's total exposure averaged over a period, not just time. Total time is wrong.
题目解析
The correct answer is D: The total RF exposure averaged over a certain period. What 'time averaging' means when evaluating RF radiation exposure is the total RF exposure averaged over a certain period. Time averaging accounts for the fact that exposure varies over time, so it's averaged over a specified period (typically 6 minutes for controlled, 30 minutes for uncontrolled). For amateur radio operators, this is important for RF exposure calculations. Understanding this helps ensure accurate exposure evaluation.
考试技巧
Time averaging = total RF exposure averaged over certain period. Think 'T'ime 'A'veraging = 'T'otal 'A'veraged exposure. Time averaging accounts for varying exposure over time, averaged over specified period (6 or 30 minutes). Not 24-hour power, not time for effects, not total time - just averaged exposure.
记忆口诀
Time averaging = total RF exposure averaged over certain period. Think 'T'ime 'A'veraging = 'T'otal 'A'veraged. Time averaging accounts for varying exposure over time, averaged over specified period. Important for RF exposure calculations.
实际应用示例
Time averaging: RF exposure varies over time (transmitter on/off, different power levels). Time averaging takes the total RF exposure and averages it over a specified period (6 minutes for controlled exposure, 30 minutes for uncontrolled exposure). This gives an average exposure level. This is what time averaging means - total RF exposure averaged over a certain period.
错误选项分析
Option A: Incorrect. Time averaging isn't average power developed over 24 hours - it's total exposure averaged over a period (6 or 30 minutes), not 24 hours. 24-hour period is wrong. Option B: Incorrect. Time averaging isn't average time for long-term effects - it's averaging exposure over time, not time for effects. Time for effects is wrong. Option C: Incorrect. Time averaging isn't just total time of exposure - it's total exposure averaged over a period, not just time. Total time is wrong.
知识点
Time averaging, RF radiation exposure, Total RF exposure, Averaged over period
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.