Electrical Engineering › Section I · Sinusoidal waveforms and phasors › Topic I.4
AC meters and instruments
Point a multimeter at an ac signal and it shows a single number, but which number depends on how the meter works. Knowing whether a meter responds to the average or to the true rms value, and what an oscilloscope really shows, keeps you from trusting a reading that is quietly wrong.
In this topic
- Turning a wave into one number
- Average-responding meters
- Worked example: an average-responding meter on other shapes
- True-rms meters
- Crest factor
- Clamp meters and frequency counters
- The oscilloscope
- Worked example: a signal with a dc level
- Mains supplies and safety
- Common mistakes to avoid
- Key takeaways
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