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

 

I have made a change to the text to substitute analog D'Arsonval meter movement for analog meter movement. Thanks for pointing out this error. I will post back when I update ibiblio.

 

I have updated the ibiblio copy for numerous corrections (not just for this thread) over the last few days. The list of affected files and images follows:
DC V1:dcmeter.sml contrib.sml 00502.png
AC V2:basicac.sml contrib.sml
Semi V3: bjt.sml diode.sml contrib.sml theory.sml 03288.png 03304.png 03392.png
Digital V4: boolean.sml contrib.sml