correct - true RMS and averaging are identical for a pure sine wave - at one time, the ONLY way to actually get a TRUE RMS reading was to power a resistor, and measure the heat given off, and is actually still the most accurate way, as all other methods actually use a sampling of the area under the curve - the more samples the better - but of course, this is just someone who has done some metrology speaking (calibration of instraments)

BTW did I mention I was an electronics tech for 12 years, before the military electronics field went bust on Long Island?