Which trigger mode is most effective when using an oscilloscope to measure a linear power supply’s output ripple?
The correct answer is D: Line. Which trigger mode is most effective when using an oscilloscope to measure a linear power supply's output ripple is line. Line trigger synchronizes to AC line frequency, ideal for ripple measurement. For amateur radio operators, this is important for test equipment. Understanding this helps when measuring power supply ripple.
Exam Tip
Oscilloscope trigger for power supply ripple = line trigger. Think 'L'inear 'P'ower 'S'upply 'R'ipple = 'L'ine trigger. Line trigger synchronizes to AC line frequency, ideal for ripple measurement. Not single-shot, not edge, not level - just line.
Memory Aid
"Oscilloscope trigger for power supply ripple = line trigger. Think 'L'inear 'P'ower 'S'upply = 'L'ine trigger. Line trigger synchronizes to AC line frequency, ideal for ripple measurement. Important for test equipment."
Real-World Application
Measuring a linear power supply's output ripple with an oscilloscope: Line trigger mode is most effective. Line trigger synchronizes to the AC line frequency (50/60 Hz), which is the frequency of the ripple. This provides a stable display of the ripple waveform. This is the trigger mode - line trigger for ripple measurement.
Key Concepts
Why Other Options Are Wrong
Option A (Single-shot): Incorrect. Single-shot isn't effective for ripple - line trigger synchronizes to AC line frequency. Single-shot isn't effective.
Option B (Edge): Incorrect. Edge trigger isn't as effective - line trigger synchronizes to AC line frequency for ripple. Edge isn't as effective.
Option C (Level): Incorrect. Level trigger isn't as effective - line trigger synchronizes to AC line frequency for ripple. Level isn't as effective.
题目解析
The correct answer is D: Line. Which trigger mode is most effective when using an oscilloscope to measure a linear power supply's output ripple is line. Line trigger synchronizes to AC line frequency, ideal for ripple measurement. For amateur radio operators, this is important for test equipment. Understanding this helps when measuring power supply ripple.
考试技巧
Oscilloscope trigger for power supply ripple = line trigger. Think 'L'inear 'P'ower 'S'upply 'R'ipple = 'L'ine trigger. Line trigger synchronizes to AC line frequency, ideal for ripple measurement. Not single-shot, not edge, not level - just line.
记忆口诀
Oscilloscope trigger for power supply ripple = line trigger. Think 'L'inear 'P'ower 'S'upply = 'L'ine trigger. Line trigger synchronizes to AC line frequency, ideal for ripple measurement. Important for test equipment.
实际应用示例
Measuring a linear power supply's output ripple with an oscilloscope: Line trigger mode is most effective. Line trigger synchronizes to the AC line frequency (50/60 Hz), which is the frequency of the ripple. This provides a stable display of the ripple waveform. This is the trigger mode - line trigger for ripple measurement.
错误选项分析
Option A (Single-shot): Incorrect. Single-shot isn't effective for ripple - line trigger synchronizes to AC line frequency. Single-shot isn't effective. Option B (Edge): Incorrect. Edge trigger isn't as effective - line trigger synchronizes to AC line frequency for ripple. Edge isn't as effective. Option C (Level): Incorrect. Level trigger isn't as effective - line trigger synchronizes to AC line frequency for ripple. Level isn't as effective.
知识点
Oscilloscope trigger mode, Linear power supply output ripple, Line trigger, Ripple measurement
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.