On this page:
http://www.allaboutcircuits.com/vol_2/chpt_1/3.html#at
it is said that "...the degree of needle deflection in an analog meter movement is proportional to the average value of the waveform, not the RMS."
This is not true generally. It is true for the d'Arsonval type movement, but there are other analog movements which respond to the RMS value.
For example, see:
http://www.answerbag.com/q_view/688559
http://www.eltime.co.uk/product.php/1/Moving Iron Meters.html
http://www.allaboutcircuits.com/vol_2/chpt_1/3.html#at
it is said that "...the degree of needle deflection in an analog meter movement is proportional to the average value of the waveform, not the RMS."
This is not true generally. It is true for the d'Arsonval type movement, but there are other analog movements which respond to the RMS value.
For example, see:
http://www.answerbag.com/q_view/688559
http://www.eltime.co.uk/product.php/1/Moving Iron Meters.html