How To Do You Measure the Quality of Your AC Power?


What is the best way to measure the quality of the AC power feeding your listening room? Is there a device you can plug into an outlet that will give you the voltage, frequency, the total amount of distortion relative to a perfect sine wave, etc.? Furthermore, how would you measure the ability of your AC main to deliver transient currents?
It seems like there may be a scenario where you could measure your power quality to be excellent but somewhere in the line you could have a loose or poorly made wiring connection which under heavy load (such as powerful bass notes) you could run into trouble with power delivery. In this scenario, an AC regenerator would not help you, or would help very little.

Just curious what methods people have come up with to systematically analyze their power and how they use those measurements to drive buying decisions or repair work, if needed.

Edit: My apologies for the title typo.
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Showing 1 response by cakyol

The quality of the mains sine wave does not matter too much as long as it is able to magnetically excite the transformers of your electronics.  Also noise, including RF noise is usually very well filtered out by good quality power supplies. What remains is the current delivery capability of your circuit when it matters. And that is usually dictated by the quality of the internal wiring of your house. İf you are noticing dimming, that is indicative of too much voltage drop in your wiring. İs your house wired with a lower gauge wiring ?  Or is it an older house with aluminum wires ?  Are there any loose, corroded or bad connections from your panel to the plug ?  İs there any 'coiling' of your wire anywhere, causing inductance which resists current delivery if it becomes significant enuf ?